UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form S-4

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

SJW GROUP

(Exact name of registrant as specified in its charter)

110 West Taylor Street

San Jose, California 95110

(408) 279-7800

(Address, including zip code, and telephone number, including area code, of registrant’s principal executive offices)

Suzy Papazian

General Counsel and Corporate Secretary

SJW Group

110 West Taylor Street

San Jose, California 95110

(408) 279-7800

(Name, address, including zip code, and telephone number, including area code, of agent for service)

Copies to:

Approximate date of commencement of proposed sale of the securities to the public: As soon as practicable after this Registration Statement becomes effective and upon completion of the merger described in the enclosed joint proxy statement/prospectus.

If the securities being registered on this Form are being offered in connection with the formation of a holding company and there is compliance with General Instruction G, check the following box.  ☐

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.  ☐

If this Form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act .  ☐

If applicable, place an X in the box to designate the appropriate rule provision relied upon in conducting this transaction:

CALCULATION OF REGISTRATION FEE

(1) Represents the estimated maximum number of shares of the Registrant’s common stock, par value $0.001 per share, to be issued upon completion of the merger described herein. This number is based on 12,478,553 shares of Connecticut Water Service, Inc. (“CTWS”) common stock, without par value, the estimated maximum number of shares of CTWS common stock outstanding or reserved for issuance under various equity plans or otherwise, immediately prior to the merger, and the exchange of each such share of CTWS common stock for 1.1375 shares of SJW Group (“SJW”) common stock, pursuant to the terms of the Agreement and Plan of Merger dated as of March 14, 2018, among SJW, Hydro Sub, Inc. and CTWS, which is attached to the joint proxy statement/prospectus included in this Registration Statement on Form S-4 as Annex A.

(2) The proposed maximum aggregate offering price of the registrant’s common stock was calculated based upon the market value of shares of CTWS common stock in accordance with Rules 457(c) and 457(f) under the Securities Act as follows: the product of (A) $64.39, the average of the high and low prices per share of CTWS common stock as reported on the New York Stock Exchange on April 20, 2018 and (B) 12,478,553, the estimated maximum number of shares of CTWS common shares that may be canceled and exchanged in the offer, including shares reserved for issuance under various equity plans or otherwise.

(3) Estimated solely for the purpose of calculating the registration fee required by Section 6(b) of the Securities Act and calculated pursuant to Rules 457(c) and 457(f) under the Securities Act, based on a rate of $124.50 per $1,000,000 of the proposed maximum aggregate offering price.

The registrant hereby amends this registration statement on such date or dates as may be necessary to delay its effective date until the registrant shall file a further amendment which specifically states that this registration statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act, or until the registration statement shall become effective on such date as the Securities and Exchange Commission, acting pursuant to said Section 8(a), may determine.

Information contained herein is subject to completion or amendment. A registration statement relating to these securities has been filed with the Securities and Exchange Commission. These securities may not be sold nor may offers to buy be accepted prior to the time the registration statement becomes effective. This joint proxy statement/prospectus shall not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sale of such securities, in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to appropriate registration or qualification under the securities laws of such jurisdiction.

PRELIMINARY — SUBJECT TO COMPLETION — DATED APRIL 25, 2018

MERGER PROPOSED — YOUR VOTE IS VERY IMPORTANT

Dear Stockholders:

The boards of directors of SJW Group (“SJW”) and Connecticut Water Service, Inc. (“CTWS”) have unanimously approved, and SJW and CTWS have entered into, an Agreement and Plan of Merger, dated as of March 14, 2018 (the “merger agreement”), with respect to a “merger of equals” strategic business combination (the “merger”) between SJW and CTWS. Pursuant to the terms of the merger agreement, Hydro Sub, Inc., a wholly owned subsidiary of SJW and a party to the merger agreement (“Merger Sub”), will merge with and into CTWS, with CTWS surviving the merger as a wholly owned subsidiary of SJW. Upon completion of the merger, SJW and CTWS, and their respective subsidiaries, will operate as a combined company initially under the name “SJW Group”, which name will be changed within two years following the merger to a new name representing the combined company.

Upon completion of the merger, each issued and outstanding share of CTWS common stock (other than those owned directly or indirectly by CTWS, SJW or any of their respective subsidiaries that are not held on behalf of third parties) will be converted into the right to receive 1.1375 shares of SJW common stock (the “exchange ratio”). This exchange ratio will not be adjusted for changes in the market price of either SJW common stock or CTWS common stock between the date of signing of the merger agreement and completion of the merger.

Based on the estimated number of shares of SJW common stock and CTWS common stock that will be outstanding immediately prior to the closing of the merger, upon such closing, SJW stockholders immediately prior to the effective time of the merger will own approximately 60% of the combined company and CTWS shareholders immediately prior to the effective time of the merger will own approximately 40% of the combined company. The combined company will be listed on the New York Stock Exchange (the “NYSE”) initially under SJW’s current symbol, “SJW.”

SJW and CTWS will each hold a special meeting of its respective shareholders to consider the proposed merger. At the special meeting of SJW stockholders, SJW stockholders will be asked to vote on the proposal to approve the issuance of shares of SJW common stock to CTWS shareholders pursuant to the merger, the proposal to adopt the amendment to the SJW certificate of incorporation (the “SJW certificate of incorporation amendment”) and the proposal to adjourn the SJW special meeting, if necessary or appropriate, to solicit additional proxies if there are not sufficient votes to approve the issuance of shares of SJW common stock to CTWS shareholders pursuant to the merger or the adoption of the SJW certificate of incorporation amendment. At the special meeting of CTWS shareholders, CTWS shareholders will be asked to vote on the proposal to approve the merger agreement, the proposal to approve, on a non-binding advisory basis, specific compensatory arrangements between CTWS and its named executive officers relating to the merger and the proposal to adjourn the CTWS special meeting, if necessary or appropriate, to solicit additional proxies if there are not sufficient votes to approve the merger agreement.

Completion of the merger is conditioned on, among other things, approval of the issuance of shares of SJW common stock to CTWS shareholders pursuant to the merger and the adoption of the SJW certificate of incorporation amendment by SJW stockholders and approval of the merger agreement by CTWS shareholders. Your vote is very important, regardless of the number of shares you own. Whether or not you expect to attend either special meeting in person, please submit a proxy to vote your shares as promptly as possible so that your shares may be represented and voted at the SJW or CTWS special meeting, as applicable.

The SJW board of directors unanimously approved the merger agreement and determined that the merger agreement and the transactions contemplated thereby, including the merger, are advisable and in the best interests of SJW and its stockholders. The SJW board of directors unanimously recommends that SJW stockholders vote “FOR” the proposal to approve the issuance of shares of SJW common stock to CTWS shareholders pursuant to the merger, “FOR” the proposal to adopt the SJW certificate of incorporation amendment and “FOR” the proposal to approve any motion to adjourn the SJW special meeting, if necessary or appropriate, to solicit additional proxies if there are not sufficient votes to approve the issuance of shares of SJW common stock to CTWS shareholders pursuant to the merger or the adoption of the SJW certificate of incorporation amendment.

The CTWS board of directors unanimously (i) determined that the merger agreement and the consummation of the transactions contemplated thereby, including the merger, are in the best interests of CTWS and its shareholders, (ii) declared advisable the merger agreement and the transactions contemplated thereby, including the merger, and (iii) approved and adopted the merger agreement and the transactions contemplated thereby, including the merger. The CTWS board of directors unanimously recommends that CTWS shareholders vote “FOR” the proposal to approve the merger agreement, “FOR” the proposal to approve, on a non-binding advisory basis, specific compensatory arrangements between CTWS and its named executive officers relating to the merger and “FOR” the proposal to adjourn the CTWS special meeting, if necessary or appropriate, to solicit additional proxies if there are not sufficient votes to approve the merger agreement.

The obligations of SJW and CTWS to complete the merger are subject to the satisfaction or waiver of several conditions set forth in the merger agreement. The accompanying joint proxy statement/prospectus contains detailed information about SJW, CTWS, the special meetings, the merger agreement and the merger. SJW and CTWS encourage you to read the joint proxy statement/prospectus carefully and in its entirety, including the section entitled “Risk Factors” beginning on page 27 of this joint proxy statement/prospectus.

We look forward to the successful combination of SJW and CTWS.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved the merger and other transactions described in the joint proxy statement/prospectus, nor have they approved or disapproved of the securities to be issued under this joint proxy statement/prospectus or determined if this joint proxy statement/prospectus is accurate or complete. Any representation to the contrary is a criminal offense.

This joint proxy statement/prospectus is dated [●], 2018 and is first being mailed to SJW stockholders and CTWS shareholders on or about [●], 2018.

Connecticut Water Service, Inc.

93 West Main Street

Clinton, Connecticut 06413

(860) 664-6056

NOTICE OF SPECIAL MEETING OF SHAREHOLDERS

To Be Held On [●], 2018

To the Shareholders of Connecticut Water Service, Inc.:

We are pleased to invite you to attend the special meeting of shareholders of Connecticut Water Service, Inc., a Connecticut corporation (“CTWS”), which will be held at [●] on [●], 2018 at [●], local time, for the following purposes:

CTWS will transact no other business at the special meeting except such business as may properly be brought before the special meeting or any adjournments or postponements thereof. Please refer to the joint proxy statement/prospectus of which this notice forms a part for further information with respect to the business to be transacted at the CTWS special meeting.

Completion of the merger is conditioned on, among other things, approval of the merger agreement by CTWS shareholders.

The CTWS board of directors unanimously (i) determined that the merger agreement and the consummation of the transactions contemplated thereby, including the merger, are in the best interests of CTWS and its shareholders, (ii) declared advisable the merger agreement and the transactions contemplated thereby, including the merger, and (iii) approved and adopted the merger agreement and the transactions contemplated thereby, including the merger. The CTWS board of directors unanimously recommends that CTWS shareholders vote “FOR” the proposal to approve the merger agreement, “FOR” the proposal to approve, on a non-binding advisory basis, specific compensatory arrangements between CTWS and its named executive officers relating to the merger and “FOR” the proposal to adjourn the CTWS special meeting, if necessary or appropriate, to solicit additional proxies if there are not sufficient votes to approve the merger agreement.

The CTWS board of directors has fixed the close of business on [●], 2018 as the record date (the “CTWS record date”) for determination of holders of CTWS common stock entitled to receive notice of, and to vote at, the CTWS special meeting or any adjournments or postponements thereof. As of the CTWS record date, CTWS issued and outstanding capital stock consists solely of outstanding shares of CTWS common stock. Accordingly, only holders of record of CTWS common stock at the close of business on the CTWS record date are entitled to receive notice of, and to vote at, the CTWS special meeting or at any adjournments or postponements thereof. Approval of the merger agreement requires the affirmative vote of holders of two-thirds (66 2/3 %) of the outstanding shares of CTWS common stock entitled to vote thereon. Approval, on a non-binding advisory basis, of specific compensatory arrangements between CTWS and its named executive officers relating to the merger

requires that the votes favoring the action cast by the shareholders entitled to vote thereon exceed the votes opposing the action cast by the shareholders entitled to vote thereon, although such vote will not be binding on CTWS or the CTWS board of directors or any of its committees. Approval of the proposal to adjourn the CTWS special meeting, if necessary or appropriate, to solicit additional proxies if there are not sufficient votes to approve the merger agreement requires that the votes favoring the action cast by the shareholders entitled to vote thereon exceed the votes opposing the action cast by the shareholders entitled to vote thereon. A list of the names of CTWS shareholders of record will be available for 10 days prior to the CTWS special meeting for any purpose germane to the special meeting between the hours of 8:30 a.m. and 4:30 p.m., local time, at CTWS’s headquarters, 93 West Main Street, Clinton, Connecticut 06413. The CTWS shareholder list will also be available at the CTWS special meeting for examination by any shareholder present at such meeting.

Your vote is very important. Whether or not you expect to attend the CTWS special meeting in person, we urge you to submit a proxy to vote your shares as promptly as possible by either:

(1) logging onto www.proxyvote.com and following the instructions on your proxy card;

(2) dialing (800) 454-8683 and listening for further directions; or

(3) signing, dating and returning the enclosed proxy card in the postage-paid envelope provided, so that your shares may be represented and voted at the CTWS special meeting.

If your shares are held in a CTWS plan or in the name of a broker, bank or other nominee, please follow the instructions on the voting instruction card furnished by the record holder, as appropriate. If you do not follow these instructions, your shares cannot be voted.

The enclosed joint proxy statement/prospectus provides a detailed description of the merger and the merger agreement. We urge you to read this joint proxy statement/prospectus, including any documents incorporated by reference, and the Annexes carefully and in their entirety. If you have any questions concerning the merger or this joint proxy statement/prospectus, would like additional copies or need help voting your shares of CTWS common stock, please contact CTWS’s proxy solicitor:

Morrow Sodali LLC

470 West Avenue

Stamford, Connecticut 06902

Shareholders May Call Toll-Free: (800) 662-5200

Banks and Brokers May Call: (203) 658-9400

SJW Group

110 West Taylor Street

San Jose, California 95110

(408) 279-7800

NOTICE OF SPECIAL MEETING OF STOCKHOLDERS

To Be Held On [●], 2018

To the Stockholders of SJW Group:

We are pleased to invite you to attend the special meeting of stockholders of SJW Group (“SJW”), a Delaware corporation, which will be held at 110 West Taylor Street, San Jose, California 95110, on [●], 2018, at [●], local time, for the following purposes:

SJW will transact no other business at the special meeting except such business as may properly be brought before the special meeting or any adjournments or postponements thereof. Please refer to the joint proxy statement/prospectus of which this notice forms a part for further information with respect to the business to be transacted at the SJW special meeting.

Completion of the merger is conditioned on, among other things, approval of the issuance of shares of SJW common stock to CTWS shareholders pursuant to the merger and the adoption of the SJW certificate of incorporation amendment by SJW stockholders.

The SJW board of directors unanimously approved the merger agreement and determined that the merger agreement and the transactions contemplated thereby, including the merger, are advisable and in the best interests of SJW and its stockholders. The SJW board of directors unanimously recommends that SJW stockholders vote “FOR” the proposal to approve the issuance of shares of SJW common stock to CTWS shareholders pursuant to the merger, “FOR” the proposal to adopt the SJW certificate of incorporation amendment and “FOR” the proposal to approve any motion to adjourn the SJW special meeting, if necessary or appropriate, to solicit additional proxies if there are not sufficient votes to approve the issuance of shares of SJW common stock to CTWS shareholders pursuant to the merger or the adoption of the SJW certificate of incorporation amendment.

The SJW board of directors has fixed the close of business on [●] as the record date for determination of SJW stockholders entitled to receive notice of, and to vote at, the SJW special meeting or any adjournments or postponements thereof. SJW issued and outstanding capital stock consists solely of outstanding shares of SJW common stock. Accordingly, only holders of record of SJW common stock at the close of business on the record date are entitled to receive notice of, and to vote at, the SJW special meeting or at any adjournments or postponements thereof. The issuance of shares of SJW common stock requires the affirmative vote of holders of a majority of the outstanding shares of SJW common stock present in person or represented by proxy at the SJW

special meeting and entitled to vote on the proposal. Adoption of the SJW certificate of incorporation amendment requires the affirmative vote of holders of a majority of the outstanding shares of SJW common stock entitled to vote on the proposal. Adjournment of the SJW special meeting requires the affirmative vote of holders of a majority of the outstanding shares of SJW common stock present in person or represented by proxy at the SJW special meeting and entitled to vote on the proposal. A list of the names of SJW stockholders of record will be available for 10 days prior to the SJW special meeting for any purpose germane to the special meeting between the hours of 8:30 a.m. and 4:30 p.m., local time, at the office of SJW’s Corporate Secretary, 110 West Taylor Street, San Jose, California 95110. The SJW stockholder list will also be available at the SJW special meeting for examination by any stockholder present at such meeting.

Your vote is very important. Whether or not you expect to attend the SJW special meeting in person, we urge you to submit a proxy to vote your shares as promptly as possible by either:

(1) logging onto www.proxyvote.com and following the instructions on your proxy card;

(2) dialing (866) 357-4029 and listening for further directions; or

(3) signing, dating and returning the enclosed proxy card in the postage-paid envelope provided, so that your shares may be represented and voted at the SJW special meeting.

If your shares are held in the name of a bank, broker or other nominee, including an employee benefit plan trustee, please follow the instructions on the voting instruction card furnished by the record holder, as appropriate. If you do not follow these instructions, your shares cannot be voted.

The enclosed joint proxy statement/prospectus provides a detailed description of the merger and the merger agreement as well as a description of the proposed issuance of shares of SJW common stock to CTWS shareholders pursuant to the merger and a description of the SJW certificate of incorporation amendment. We urge you to read this joint proxy statement/prospectus, including any documents incorporated by reference, and the Annexes carefully and in their entirety. If you have any questions concerning the merger or this joint proxy statement/prospectus, would like additional copies or need help voting your shares of SJW common stock, please contact SJW’s proxy solicitor:

Georgeson LLC

1290 Avenue of the Americas, 9th Floor

New York, New York 10104

Stockholders, Banks and Brokers May Call Toll-Free: (866) 357-4029

ADDITIONAL INFORMATION

This joint proxy statement/prospectus incorporates important business and financial information about SJW and CTWS from other documents that are not included in or delivered with this joint proxy statement/prospectus. This information is available to you without charge upon your request. You can obtain the documents incorporated by reference into this joint proxy statement/prospectus free of charge by requesting them in writing or by telephone from the appropriate company’s proxy solicitor at the following addresses and telephone numbers:

You may also obtain any of the documents incorporated by reference into this joint proxy statement/prospectus without charge through the U.S. Securities and Exchange Commission (the “SEC”) website at www.sec.gov. In addition, you may obtain copies of documents filed by SJW with the SEC by accessing SJW’s website at www.sjwgroup.com under the heading “Investor Relations” and then under the heading “SEC Filings.” You may also obtain copies of documents filed by CTWS with the SEC by accessing CTWS’s website at www.ctwater.com under the tab “Investors” and then under the tab “SEC Filings.”

We are not incorporating the contents of the websites of the SEC, SJW, CTWS or any other entity into this joint proxy statement/prospectus. We are providing the information about how you can obtain certain documents that are incorporated by reference into this joint proxy statement/prospectus at these websites only for your convenience.

If you would like to request any documents, please do so by [●], 2018 in order to receive them before the special meetings.

For a more detailed description of the information incorporated by reference in this joint proxy statement/prospectus and how you may obtain it, see the section entitled “Where You Can Find More Information” beginning on page 181 of this joint proxy statement/prospectus.

ABOUT THIS JOINT PROXY STATEMENT/PROSPECTUS

This joint proxy statement/prospectus, which forms part of a registration statement on Form S-4 filed with the SEC by SJW, constitutes a prospectus of SJW under Section 5 of the Securities Act of 1933, as amended (the “Securities Act”), with respect to the shares of SJW common stock to be issued to CTWS shareholders pursuant to the merger. This joint proxy statement/prospectus also constitutes a joint proxy statement for both SJW and CTWS under Section 14(a) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). It also constitutes a notice of meeting with respect to the special meeting of SJW stockholders and a notice of meeting with respect to the special meeting of CTWS shareholders.

You should rely only on the information contained in or incorporated by reference into this joint proxy statement/prospectus. No one has been authorized to provide you with information that is different from that contained in, or incorporated by reference into, this joint proxy statement/prospectus. This joint proxy statement/prospectus is dated [●], 2018. You should not assume that the information contained in this joint proxy statement/prospectus is accurate as of any date other than that date. You should not assume that the information incorporated by reference into this joint proxy statement/prospectus is accurate as of any date other than the date of the incorporated document. Neither our mailing of this joint proxy statement/prospectus to SJW stockholders or CTWS shareholders nor the issuance by SJW of shares of common stock pursuant to the merger will create any implication to the contrary.

This joint proxy statement/prospectus does not constitute an offer to sell, or a solicitation of an offer to buy, any securities, or the solicitation of a proxy or offer to sell or buy securities in any jurisdiction to or from any person to whom it is unlawful to make any such offer or solicitation. Information contained in this joint proxy statement/prospectus regarding SJW has been provided by SJW and information contained in this joint proxy statement/prospectus regarding CTWS has been provided by CTWS.

All references in this joint proxy statement/prospectus to “SJW” refer to SJW Group, a Delaware corporation; all references in this joint proxy statement/prospectus to “CTWS” refer to Connecticut Water Service, Inc., a Connecticut corporation; and all references to “Merger Sub” refer to Hydro Sub, Inc., a Connecticut corporation and wholly owned subsidiary of SJW formed for the sole purpose of effecting the merger. Unless otherwise indicated or as the context requires, all references in this joint proxy statement/prospectus to “we,” “our” and “us” refer to SJW and CTWS collectively; and, unless otherwise indicated or as the context requires, all references to the “merger agreement” refer to the Agreement and Plan of Merger, dated as of March 14, 2018, by and among SJW, CTWS and Merger Sub, a copy of which is included as Annex A to this joint proxy statement/prospectus. SJW, following completion of the merger, is sometimes referred to in this joint proxy statement/prospectus as the “combined company” or “Combined SJW.” CTWS, following completion of the merger, is sometimes referred to in this joint proxy statement/prospectus as the “New England Region.”

TABLE OF CONTENTS

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ii

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Annex A — Agreement and Plan of Merger

Annex B — Opinion of J.P. Morgan Securities LLC

Annex C — Opinion of Wells Fargo Securities LLC

Annex D — Form of SJW Certificate of Incorporation Amendment

Annex E — Voting and Support Agreement (George Edward Moss Trust)

Annex F — Voting and Support Agreement (Roscoe Moss Jr. Trust)

Annex G — Voting and Support Agreement (Robert A. Van Valer)

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QUESTIONS AND ANSWERS

The following are some questions that you, as a stockholder of SJW Group (“SJW”) or a shareholder of Connecticut Water Service, Inc. (“CTWS”), may have regarding the merger and the other matters being considered at the special meetings and the answers to those questions. SJW and CTWS urge you to carefully read the remainder of this joint proxy statement/prospectus because the information in this section does not provide all the information that might be important to you with respect to the merger and the other matters being considered at the special meetings. Additional important information is also contained in the Annexes to, and the documents incorporated by reference into, this joint proxy statement/prospectus.

In order to complete the merger, among other things:

SJW and CTWS will hold separate special meetings of their respective shareholders to obtain these approvals. This joint proxy statement/prospectus, including its Annexes, contains and incorporates by reference important information about SJW, CTWS, the special meetings, the merger agreement and the merger. You should read all the available information carefully and in its entirety.

CTWS Shareholders: If the merger is completed, holders of CTWS common stock will receive 1.1375 shares of SJW common stock for each share of CTWS common stock they hold immediately prior to the effective time of the merger. CTWS shareholders will not receive any fractional shares of SJW common stock in the merger. Instead, CTWS shareholders will receive cash in lieu of any fractional shares of SJW common stock that CTWS shareholders would otherwise have been entitled to receive.

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CTWS Shareholders: The special meeting of CTWS shareholders will be held at [●], on [●], 2018, at [●], local time.

If you wish to attend your respective company’s special meeting, you must bring photo identification. If you hold your shares through a bank, broker or other nominee, including an employee benefit plan trustee, you must also bring proof of ownership such as the voting instruction form from your broker or other nominee or an account statement.

For information on voting in advance of your respective company’s special meeting, see “The SJW Special Meeting — Voting at the Special Meeting By Proxy” and “The CTWS Special Meeting — Voting at the Special Meeting By Proxy” beginning, respectively, on page 21 and page 22 of this joint proxy statement/prospectus.

CTWS Shareholders: The record date for the CTWS special meeting is [●], 2018. Only holders of record of outstanding shares of CTWS common stock as of the close of business on the CTWS record date are entitled to notice of, and to vote at, the CTWS special meeting or any adjournments or postponements of the CTWS special meeting.

(1) to approve the issuance of SJW common stock to CTWS shareholders pursuant to the merger;

(2) to approve the adoption of the SJW certificate of incorporation amendment in connection with the merger, which increases the number of authorized shares of SJW stock to 73 million, including 72 million shares of common stock; and

(3) to approve any motion to adjourn the SJW special meeting, if necessary or appropriate, to solicit additional proxies if there are not sufficient votes to approve the issuance of shares of SJW common stock to CTWS shareholders pursuant to the merger or the adoption of the SJW certificate of incorporation amendment.

Approval by SJW stockholders of the share issuance proposal and the proposal concerning adoption of the SJW certificate of incorporation amendment is required to complete the merger.

CTWS shareholders are being asked to vote on the following proposals:

(1) to approve the merger agreement, a copy of which is included as Annex A to this joint proxy statement/prospectus;

(2) to approve, on a non-binding advisory basis, specific compensatory arrangements between CTWS and its named executive officers relating to the merger; and

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(3) to adjourn the CTWS special meeting, if necessary or appropriate, to solicit additional proxies if there are not sufficient votes to approve the merger agreement.

Approval by CTWS shareholders of the proposal to approve the merger agreement is required to complete the merger. The SEC has adopted rules that require CTWS to seek an advisory (non-binding) vote on compensation that is tied to or based on completion of the merger and that will or may be paid or provided by CTWS to its named executive officers in connection with the merger.

Adoption of the SJW certificate of incorporation amendment requires the affirmative vote of holders of a majority of the outstanding shares of SJW common stock entitled to vote on the proposal. Failures to vote, broker non-votes and abstentions will have the effect of a vote against this proposal.

Approval of the proposal to adjourn the SJW special meeting, if necessary or appropriate, to solicit additional proxies if there are not sufficient votes to approve the issuance of shares of SJW common stock to CTWS shareholders pursuant to the merger or the adoption of the SJW certificate of incorporation amendment requires the affirmative vote of holders of a majority of the outstanding shares of SJW common stock present in person or represented by proxy at the SJW special meeting and entitled to vote on the proposal. Failures to vote and broker non-votes will have no effect on the proposal, assuming a quorum is present. Abstentions will have the effect of a vote against this proposal.

Approval, on a non-binding advisory basis, of specific compensatory arrangements between CTWS and its named executive officers relating to the merger requires that the votes favoring the action cast by the shareholders entitled to vote thereon exceed the votes opposing the action cast by the shareholders entitled to vote thereon. Abstentions, failures to vote and broker non-votes will have no effect on the proposal, assuming a quorum is present. Because the vote regarding these specific merger-related compensatory arrangements between CTWS and its named executive officers is advisory only, it will not be binding on CTWS or, following completion of the merger, the combined company. Accordingly, if the merger is approved and completed, the CTWS named executive officers will be eligible to receive the various merger-

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related compensation that may become payable in connection with the completion of the merger, subject only to the conditions applicable thereto, regardless of the outcome of the non-binding, advisory vote of CTWS shareholders.

Approval of the proposal to adjourn the CTWS special meeting, if necessary or appropriate, to solicit additional proxies if there are not sufficient votes to approve the merger agreement requires that the votes favoring the action cast by the shareholders entitled to vote thereon exceed the votes opposing the action cast by the shareholders entitled to vote thereon. Abstentions, failures to vote and broker non-votes will have no effect on the proposal, assuming a quorum is present.

Abstentions will be included in the calculation of the number of shares of SJW common stock represented at the special meeting for purposes of determining whether a quorum has been achieved. However, broker non-votes, which are described below, will not be included.

CTWS Shareholders: Shareholders who hold shares representing at least a majority of the shares of CTWS common stock issued and outstanding as of the close of business on the CTWS record date and entitled to vote at the CTWS special meeting must be present in person or represented by proxy to constitute a quorum for the transaction of business at the CTWS special meeting. If a quorum is not present at such meeting, the shareholders present in person or by proxy may adjourn to such future time as shall be agreed upon by them, and notice of such adjournment shall be given to the shareholders not present or represented at the meeting. Abstentions and broker non-votes will be included in the calculation of the number of shares of CTWS common stock represented at the special meeting for purposes of determining whether a quorum has been achieved.

(1) “FOR” the proposal to approve the issuance of shares of SJW common stock to CTWS shareholders pursuant to the merger;

(2) “FOR” the proposal to adopt the SJW certificate of incorporation amendment; and

(3) “FOR” the proposal to adjourn the SJW special meeting, if necessary or appropriate, to solicit additional proxies if there are not sufficient votes to approve the issuance of shares of SJW common stock to CTWS shareholders pursuant to the merger or the adoption of the SJW certificate of incorporation amendment.

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(1) “FOR” the proposal to approve the merger agreement;

(2) “FOR” the proposal to approve, on a non-binding advisory basis, specific compensatory arrangements between CTWS and its named executive officers relating to the merger; and

(3) “FOR” the proposal to adjourn the CTWS special meeting, if necessary or appropriate, to solicit additional proxies if there are not sufficient votes to approve the merger agreement.

CTWS Shareholders: Holders of CTWS common stock are entitled to three votes for each share owned as of the close of business on the CTWS record date. As of the close of business on the CTWS record date, there were [●] shares of CTWS common stock outstanding and entitled to vote at the CTWS special meeting.

If you are a stockholder of record, you may also cast your vote in person at your respective company’s special meeting.

If your shares are held in “street name,” through a broker, trustee or other nominee, that institution will send you separate instructions describing the procedure for voting your shares. “Street name” stockholders who wish to vote at the meeting will need to obtain a “legal proxy” form from their broker, trustee or other nominee.

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In connection with the SJW special meeting:

In connection with the CTWS special meeting:

You should therefore provide your broker, bank, employee benefit plan trustee or other nominee with instructions as to how to vote your shares of SJW common stock or CTWS common stock.

Please follow the voting instructions provided by your broker, bank or other nominee so that it may vote your shares on your behalf. Please note that you may not vote shares held in “street name” by returning a proxy card directly to SJW or CTWS or by voting in person at your special meeting unless you first obtain a proxy from your broker, bank or other nominee.

SJW

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CTWS

CTWS Shareholders: If you properly complete and sign your proxy card but do not indicate how your shares of CTWS common stock should be voted on a matter, the shares of CTWS common stock represented by your proxy will be voted as the CTWS board of directors recommends and, therefore, “FOR” the proposal to approve the merger agreement, “FOR” the proposal to approve, on a non-binding advisory basis, specific compensatory arrangements between CTWS and its named executive officers relating to the merger and “FOR” the proposal to adjourn the CTWS special meeting, if necessary or appropriate, to solicit additional proxies if there are not sufficient votes to approve the merger agreement, assuming a quorum is present.

If you are a holder of record of either SJW or CTWS shares: If you are a holder of record of either SJW common stock or CTWS common stock, as applicable, you can change your vote or revoke your proxy at

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any time before your proxy is voted at your respective special meeting. You can do this in one of three ways:

If you choose either of the first two methods, your notice of revocation or your new proxy must be received by SJW or CTWS, as applicable, no later than the beginning of the applicable special meeting. If you have submitted a proxy for your shares by telephone or via the Internet, you may revoke your prior telephone or Internet proxy by any manner described above.

If you hold shares of either SJW or CTWS in “street name”: If your shares are held in “street name”, you must contact your broker, bank or other nominee to change your vote.

The particular consequences of the merger to each CTWS shareholder depend on such shareholder’s particular facts and circumstances. CTWS shareholders should consult their tax advisors to understand fully the consequences to them of the merger given their specific circumstances. For more information, see the section entitled “Material U.S. Federal Income Tax Consequences” beginning on page 142 of this joint proxy statement/prospectus.

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CTWS Shareholders: If you are a CTWS shareholder, after the merger is completed, each share of CTWS common stock you hold will be converted automatically into the right to receive 1.1375 shares of SJW common stock together with cash in lieu of any fractional shares, as applicable. You will receive instructions at that time regarding exchanging your shares of CTWS common stock for shares of SJW common stock. You do not need to take any action at this time. Please do not send your CTWS share certificates with your proxy card.

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SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

This joint proxy statement/prospectus and the documents incorporated by reference into this joint proxy statement/prospectus contain, in addition to historical information, “forward-looking statements” (as defined in the Securities Litigation Reform Act of 1995) regarding, among other things, future events or the future financial performance of SJW and CTWS. Words such as “anticipate,” “expect,” “project,” “intend,” “believe,” and words and terms of similar substance used in connection with any discussion of future plans, actions or events identify forward-looking statements. Forward-looking statements relating to the proposed transaction include, but are not limited to: statements about the benefits of the proposed transaction between SJW and CTWS, including future financial and operating results; SJW’s and CTWS’s plans, objectives, expectations and intentions; the expected timing of completion of the proposed transaction; and other statements relating to the merger that are not historical facts. Forward-looking statements are based on information currently available to SJW and CTWS and involve estimates, expectations and projections. Investors are cautioned that all such forward-looking statements are subject to risks and uncertainties, and important factors could cause actual events or results to differ materially from those indicated by such forward-looking statements. With respect to the proposed transaction between SJW and CTWS, these factors, in addition to those set forth under “Risk Factors,” beginning on page 27 of this joint proxy statement/prospectus, could include, but are not limited to: the risk that SJW or CTWS may be unable to obtain governmental and regulatory approvals required for the transaction, or that required governmental and regulatory approvals may delay the transaction or result in the imposition of conditions that could reduce the anticipated benefits from the proposed transaction or cause the parties to abandon the proposed transaction; the risk that a condition to closing of the transaction may not be satisfied; the length of time necessary to consummate the proposed transaction, which may be longer than anticipated for various reasons; the risk that the businesses will not be integrated successfully; the risk that some or all of the benefits expected to result from the elimination of duplicative public company and other related costs expected from the transaction may not be fully realized or may take longer to realize than expected; the diversion of management time on transaction-related issues; the effect of future regulatory or legislative actions on the companies or the industries in which they operate; the risk that the credit ratings of SJW and CTWS may be different from SJW’s expectations; general economic conditions; changes in the general economic environment or social or political conditions that could affect the businesses; the effect of current or future water, utility, environmental and other governmental policies and regulations on SJW and CTWS or the industries in which they operate; SJW’s ability to achieve forecasted sales; changes in actual or projected cash flows; competitive pressures; reliance on and integration of information technology systems; the outcomes of any litigation; changes in tax laws; the risk that the anticipated tax treatment of the transaction is not obtained; unexpected costs, charges or expenses resulting from the transaction; potential adverse reactions or changes to business relationships resulting from the announcement or completion of the transaction; the ability to attract new customers and retain existing customers in the manner anticipated; the ability to hire and retain key personnel; the risks associated with assumptions the parties make in connection with the parties’ critical accounting estimates and legal proceedings; and the potential of international unrest, economic downturn or effects of currencies, tax assessments, tax adjustments, anticipated tax rates, raw material costs or availability, benefit or retirement plan costs, or other regulatory compliance costs.

Additional information concerning these and other risk factors is also contained in SJW’s and CTWS’s most recently filed Annual Reports on Form 10-K, Current Reports on Form 8-K, and other SEC filings.

Many of these risks, uncertainties and assumptions are beyond SJW’s or CTWS’s ability to control or predict. Because of these risks, uncertainties and assumptions, you should not place undue reliance on these forward-looking statements. Furthermore, forward-looking statements speak only as of the information currently available to the parties on the date they are made, and neither SJW nor CTWS undertakes any obligation to update publicly or revise any forward-looking statements to reflect events or circumstances that may arise after the date of this communication. Nothing in this communication is intended, or is to be construed, as a profit forecast or to be interpreted to mean that earnings per SJW share or CTWS share for the current or any future financial years or those of the combined company, will necessarily match or exceed the historical published earnings per SJW share or CTWS share, as applicable. Neither SJW nor CTWS gives any assurance (1) that

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either SJW or CTWS will achieve its expectations, or (2) concerning any result or the timing thereof, in each case, with respect to any regulatory action, administrative proceedings, government investigations, litigation, warning letters, consent decree, cost reductions, business strategies, earnings or revenue trends or future financial results. All subsequent written and oral forward-looking statements concerning SJW, CTWS, the proposed transaction, the combined company or other matters and attributable to SJW or CTWS or any person acting on their behalf are expressly qualified in their entirety by the cautionary statements above.

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RISK FACTORS

In addition to the other information included and incorporated by reference in this joint proxy statement/prospectus, including the matters addressed in the section entitled “Special Note Regarding Forward-Looking Statements,” you should carefully consider the following risks before deciding how to vote. In addition, you should read and consider the risks associated with each of the businesses of SJW and CTWS because these risks will also affect the combined company. These risks can be found in SJW’s Annual Report on Form 10-K for the fiscal year ended December 31, 2017 and CTWS’s Annual Report on Form 10-K for the fiscal year ended December 31, 2017, as such risks may be updated or supplemented in each company’s subsequently filed Current Reports on Form 8-K, which are incorporated by reference into this joint proxy statement/prospectus. You should also read and consider the other information in this joint proxy statement/prospectus and the other documents incorporated by reference in this joint proxy statement/prospectus. See the section entitled “Where You Can Find More Information” beginning on page 181 of this joint proxy statement/prospectus.

Risk Factors Relating to the Merger

The exchange ratio is fixed and will not be adjusted in the event of any change in either SJW’s or CTWS’s stock price, which can affect the market value of the merger consideration at the date of the completion of the merger.

Upon closing of the merger, each share of CTWS common stock will be converted into the right to receive 1.1375 shares of SJW common stock. This exchange ratio will not be adjusted for changes in the market price of either SJW common stock or CTWS common stock between the date of signing the merger agreement and completion of the merger. Changes in the price of SJW common stock prior to the merger will affect the value of SJW common stock that CTWS shareholders will receive on the date of the merger. The exchange ratio will be adjusted appropriately to fully reflect the effect of any stock dividend, recapitalization, split, reverse split, combination, consolidation, subdivision, reclassification or exchange of shares or other similar transaction with respect to the shares of either SJW common stock or CTWS common stock prior to the closing of the merger.

The prices of SJW common stock and CTWS common stock at the closing of the merger may vary from their prices on the date the merger agreement was executed, on the date of this joint proxy statement/prospectus and on the date of each stockholders meeting. As a result, the value represented by the exchange ratio will also vary. For example, based on the range of closing prices of SJW common stock during the period from March 14, 2018, the last trading day before public announcement of the merger, through April 23, 2018, the latest practicable trading date before the date of this joint proxy statement/prospectus, the exchange ratio represented a value ranging from a high of $64.62 to a low of $58.79 for each share of CTWS common stock.

These variations could result from market assessment of the likelihood that the merger will be completed, changes in the business, operations or prospects of SJW or CTWS prior to or following the merger, litigation or regulatory considerations, general business, market, industry or economic conditions and other factors both within and beyond the control of SJW and CTWS. We may complete the merger a considerable period after the dates of both the SJW special meeting and the CTWS special meeting. Therefore, at the time of the CTWS special meeting, CTWS shareholders will not know with certainty the value of the shares of SJW common stock that they will receive upon completion of the merger. Similarly, at the time of the SJW special meeting, SJW stockholders will not know with certainty the value of the shares of SJW common stock that will be issued to holders of shares of CTWS common stock upon completion of the merger.

The merger is subject to the receipt of consents and clearances from regulatory authorities that may impose conditions that could have an adverse effect on SJW, CTWS or the combined company or, if not obtained, could prevent completion of the merger.

Completion of the merger is contingent upon, among other things, the receipt of all required regulatory approvals, which consist of filings with the SEC, compliance with and filings under the HSR Act, filing and

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acceptance of the certificate of merger with the Secretary of the State of the State of Connecticut and appropriate documents with the states having jurisdictions over SJW and CTWS, filings and approvals under the securities or “blue sky” laws of various states, filing and acceptance of the SJW certificate of incorporation amendment with the Secretary of State of the State of Delaware, authorization from the NYSE for the listing of the shares of SJW common stock to be issued as merger consideration, pre-approvals of license transfers by the FCC, compliance with the Delaware General Corporation Law (the “DGCL”) and the Connecticut Business Corporation Act (the “CBCA”), and consents required by the PURA and the MPUC.

The terms and conditions of the approvals that are granted by such governmental entities and regulatory authorities may impose requirements, limitations or costs or place restrictions on the conduct of the combined company’s business. The merger agreement may require SJW and/or CTWS to comply with conditions imposed by regulatory entities and, in certain circumstances, either company may refuse to close the merger on the basis of regulatory conditions imposed. There can be no assurance that regulators will not impose conditions, terms, obligations or restrictions or that such conditions, terms, obligations or restrictions will not have the effect of delaying completion of the merger or imposing additional material costs on or materially limiting the revenues of the combined company following the merger. Additionally, neither SJW nor CTWS can provide assurance that any such conditions, terms, obligations or restrictions will not result in the delay or abandonment of the merger, or the consummation of the merger on terms different than those contemplated by the merger agreement.

Before the merger may be completed, applicable waiting periods must expire or terminate under antitrust and competition laws. The special meetings of SJW stockholders and CTWS shareholders at which the merger-related proposals will be considered may take place before all of the required regulatory approvals have been obtained and before all conditions to such approvals, if any, are known. In this event, if the merger-related proposals are approved, SJW and CTWS may subsequently agree to conditions without further seeking stockholder approval and/or shareholder approval, as the case may be, even if such conditions could have an adverse effect on SJW, CTWS or the combined company. For a more detailed description of the regulatory review process, see the section entitled “The Merger — Regulatory Clearances Required for the Merger” beginning on page 115 of this joint proxy statement/prospectus.

Any delay in completing the merger may reduce or eliminate the benefits expected to be achieved thereunder.

In addition to the required regulatory clearances, the merger is subject to a number of other conditions beyond SJW’s and CTWS’s control that may prevent, delay or otherwise materially adversely affect its completion. We cannot predict whether and when these other conditions will be satisfied. Furthermore, the requirements for obtaining the required clearances and approvals could delay the completion of the merger for a significant period of time or prevent it from occurring. Any delay in completing the merger could cause the combined company not to realize, or to be delayed in realizing, some or all of the benefits expected to result from elimination of duplicative public company and other related costs that we expect to achieve if the merger is successfully completed within its expected time frame. See the section entitled “The Merger Agreement — Conditions to Completion of the Merger” beginning on page 134 of this joint proxy statement/prospectus.

If the merger is not consummated by the end date, SJW or CTWS may terminate the merger agreement in certain circumstances.

Either SJW or CTWS may terminate the merger agreement under certain circumstances, including, if the merger has not been consummated by March 14, 2019 (unless such date is extended automatically to June 14, 2019 pursuant to the terms of the merger agreement). However, this termination right will not be available to a party if such failure of the merger to occur on or before such date is the result of a material breach of any representation, warranty, covenant or agreement of the merger agreement by such party.

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Uncertainties associated with the merger may cause a loss of management personnel and other key employees which could adversely affect the future business and operations of the combined company.

SJW and CTWS are dependent on the experience and industry knowledge of their respective officers and other key employees to execute their business plans. The combined company’s success after the merger will depend in part upon the ability of SJW and CTWS to retain key management personnel and other key employees. Current and prospective employees of SJW and CTWS may experience uncertainty about their roles within the combined company following the merger, which may have an adverse effect on the ability of each of SJW and CTWS to attract or retain key management and other key personnel. Accordingly, no assurance can be given that the combined company will be able to attract or retain key management personnel and other key employees of SJW and CTWS to the same extent that SJW and CTWS have previously been able to attract or retain their own employees. A failure by SJW, CTWS or, following the completion of the merger, the combined company to attract, retain and motivate executives and other key employees during the period prior to or after the completion of the merger could have a negative impact on their respective businesses.

An adverse judgment in any litigation challenging the merger may prevent the merger from becoming effective or from becoming effective within the expected timeframe.

It is possible that SJW stockholders or CTWS shareholders may file lawsuits challenging the merger or the other transactions contemplated by the merger agreement, which may name SJW, the SJW board of directors, CTWS and/or the CTWS board of directors as defendants. The outcome of such lawsuits cannot be assured, including the amount of costs associated with defending these claims or any other liabilities that may be incurred in connection with the litigation of these claims. Whether or not any plaintiff’s claim is successful, this type of litigation may result in significant costs and divert management’s attention and resources, which could adversely affect the operation of SJW’s and CTWS’s business.

One of the conditions to the closing of the merger is the absence of any law or order, decree, or judgment by a court, arbitrator or other governmental entity that makes illegal or prohibits the consummation of the merger or the other transactions contemplated by the merger agreement. Consequently, if a settlement or other resolution is not reached in the lawsuits referenced above and the plaintiffs secure injunctive or other relief prohibiting, delaying or otherwise adversely affecting the parties’ ability to complete the merger, then such injunctive or other relief may prevent the merger from becoming effective within the expected time frame or at all.

Failure to complete the merger as currently contemplated or at all could negatively impact the stock prices and the future business and financial results of SJW and CTWS.

Completion of the merger is not assured and is subject to risks, including the risks that approval of the transactions by shareholders of SJW and CTWS or by governmental entities will not be obtained or that certain other closing conditions will not be satisfied. If the merger is not completed, or is completed on different terms than as contemplated by the merger agreement, the ongoing businesses and financial results of SJW and/or CTWS may be adversely affected and SJW and/or CTWS will be subject to several risks, including the following:

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Any delay in the completion of the merger, any uncertainty about the completion of the merger on terms other than those contemplated by the merger agreement and any failure to complete the merger could adversely affect the business, financial results and stock price of SJW and/or CTWS.

The merger agreement contains provisions that could discourage a potential competing acquiror of either SJW or CTWS, or could result in any competing proposal being at a lower price than it might otherwise be. However, potential competing acquirors could negatively impact the completion and timing of the proposed transaction and result in disruption and expense for both SJW and CTWS.

The merger agreement contains “no shop” provisions that, subject to limited exceptions, restrict each of SJW’s and CTWS’s ability to solicit, initiate, knowingly encourage or knowingly facilitate any takeover proposal (which includes among other things any proposal or offer made by a third party relating to any merger, amalgamation, consolidation, share exchange, other business combination, recapitalization, liquidation, dissolution or similar transaction involving SJW or CTWS, or any of their respective subsidiaries, or any sale, lease, contribution or other disposition, directly or indirectly, of any business or assets of SJW or CTWS, or any of their respective subsidiaries, representing 15% or more of the consolidated revenues, net income or assets of SJW or CTWS, or any of their respective subsidiaries, taken as a whole). In addition, the other party has an opportunity to offer to modify the terms of the merger in response to any competing acquisition proposals before the board of directors of the company that has received a third-party proposal may withdraw or qualify its recommendation with respect to the merger. See the sections entitled “The Merger Agreement — No Solicitation of Alternative Proposals”, “The Merger Agreement — Termination of the Merger Agreement” and “The Merger Agreement — Expenses and Termination Fees; Liability for Breach” beginning on pages 127, 136 and 138 of this joint proxy statement/prospectus, respectively.

These provisions could discourage a potential third-party acquiror that might have an interest in acquiring all or a significant portion of SJW or CTWS from considering or proposing that acquisition, even if it were prepared to pay consideration with a higher per share cash or market value than the market value proposed to be received or realized in the merger or might result in a potential third-party acquiror proposing to pay a lower price to the stockholders than it might otherwise have proposed to pay because of the added expense of the $42.5 million or $28.1 million termination fee, as applicable, that may become payable in certain circumstances.

On April 4, 2018, SJW received an unsolicited proposal from a third party strategic acquiror regarding the acquisition of all of the outstanding shares of SJW common stock for $68.25 per share. See “Summary—Recent Developments.” On April 5, 2018, CTWS received an unsolicited proposal from Eversource Energy regarding the acquisition of all of the outstanding shares of CTWS common stock for $63.50 per share in cash and/or stock at the election of holders of CTWS common stock. See “The Merger—Background of the Merger.” While each of SJW and CTWS has determined that the unsolicited proposal that it had received was neither a superior proposal nor reasonably likely to lead to a superior proposal, it is unclear what additional actions these third parties may take to further their proposals. Even if ultimately unsuccessful, actions taken by these or other third parties could disrupt the business of each of SJW and CTWS, could cause SJW and CTWS to incur substantial expense, and could negatively impact the expected timing of the consummation of the merger. In addition, there is a risk that, as a result of actions taken by these or other third parties, shareholders of SJW or CTWS may vote against the proposals at their respective special meetings and that, consequently, the required shareholder approvals may not be obtained.

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If the merger agreement is terminated and either SJW or CTWS determines to seek another business combination, it may not be able to negotiate a transaction with another party on terms comparable to, or better than, the terms of the merger.

The SJW voting and support agreements contains provisions that could discourage a potential competing acquiror of SJW, or could result in any competing proposal being at a lower price than it might otherwise be.

In connection with the merger agreement, on March 14, 2018, SJW entered into SJW voting and support agreements with certain holders of shares of SJW common stock (collectively, the “SJW supporting parties”). As of the record date for the SJW stockholders meeting, the SJW supporting parties collectively beneficially owned approximately [●]% of the outstanding shares of SJW common stock.

Pursuant to and during the terms of the SJW voting and support agreements, each of the SJW supporting parties agreed, subject to certain conditions and exceptions, at any meeting of SJW stockholders and each action by written consent in lieu of a meeting, or at any postponement or adjournment thereof, to vote its respective SJW supporting party shares (i) in favor of the approval of the issuance of shares of SJW common stock to CTWS shareholders pursuant to the merger; (ii) in favor of the adoption of the SJW certificate of incorporation amendment; (iii) in favor of any proposal to adjourn or postpone the meeting to a later date, if there are not sufficient votes to approve of the matters described in the immediately preceding two bullets; (iv) in favor of any other matter considered at any such meeting of SJW stockholders recommended by the SJW board of directors as required thereunder; (v) against any action or agreement that would result in a breach of any representation, warranty, covenant, agreement or other obligation of SJW in the merger agreement; (vi) against any takeover proposal in respect of SJW; and (vii) against any agreement, amendment of the SJW certificate of incorporation (other than the SJW certificate of incorporation amendment included in this joint proxy statement/prospectus) or SJW bylaws (other than as included as Exhibit C of the merger agreement) or other action that would delay, postpone or discourage the consummation of the merger.

The SJW voting and support agreements also provide, among other things and subject to certain conditions and exceptions, the SJW supporting parties (i) will not, and will not to agree to, (A) sell, transfer, give, pledge, encumber, assign or otherwise dispose of any of its respective SJW supporting party shares; (B) deposit such shares into a voting trust or grant any proxies or enter into a voting agreement, power of attorney or voting trust with respect to them; (C) permit such shares to become subject to liens; or (D) take any action that would make any representation or warranty of such SJW supporting party set forth in the respective SJW voting and support agreement untrue or incorrect in any material respect or have the effect of preventing, disabling or delaying such SJW supporting party from performing any of his obligations thereunder; and (ii) will not, directly or indirectly, (A) solicit, initiate, cause, knowingly facilitate or knowingly encourage (including by way of furnishing information) any inquiries or proposals that constitute, or may reasonably be expected to lead to, any takeover proposal in respect of SJW; (B) participate in any discussions or negotiations with any third party regarding any takeover proposal in respect of SJW (other than to inform any person of such prohibition); or (C) enter into any agreement related to any takeover proposal in respect of SJW, unless SJW notifies such SJW supporting party that SJW is permitted to take similar actions in response to a takeover proposal in accordance with the terms of the merger agreement.

For more information on the SJW voting and support agreements, see the section entitled “The Merger — SJW Voting and Support Agreements” beginning on page 117 of this joint proxy statement/prospectus. The existence of the SJW voting and support agreements could discourage a potential competing acquiror that might have an interest in acquiring all or a significant part of SJW.

SJW’s and CTWS’s executive officers and directors have certain interests in the merger that may be different from, or in addition to, the interests of SJW stockholders and CTWS shareholders generally.

SJW’s and CTWS’s executive officers and directors have certain interests in the merger that may be different from, or in addition to, the interests of SJW stockholders and CTWS shareholders generally. SJW’s

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executive officers and CTWS’s executive officers negotiated the terms of the merger agreement. SJW’s and CTWS’s executive officers and directors also have rights to indemnification and directors’ and officers’ liability insurance that will survive completion of the merger.

Upon completion of the merger, the board of directors of the combined company will be comprised of twelve members, consisting of seven of the directors of SJW immediately prior to the effective time of the merger and five of the directors of CTWS immediately prior to the effective time of the merger. Unless otherwise determined by the affirmative vote of at least 75% of the entire board of directors of the combined company, such board composition will continue until the termination of the term of office that commences upon the close of the annual stockholders meeting at which directors of combined company are elected during the calendar year ended December 31, 2020. For more information on the combined company’s board of directors, see the section entitled “ — Governance Matters After the Merger” beginning on page 130 of this joint proxy statement/prospectus.

Mr. Thornburg, the current chief executive officer and president of SJW, will serve as chairman, chief executive officer and president of the combined company. Mr. Thornburg, who was the chairman, chief executive officer and president of CTWS until September 28, 2017 and an employee of CTWS until October 15, 2017, continues to hold 25,749 shares of CTWS common stock and 126,662 CTWS DSUs (which will be settled in shares of CTWS common stock on June 15, 2018, subject to the terms of the CTWS 2014 Performance Stock Program), as of April 13, 2018. Mr. Benoit, currently the president and chief executive officer of CTWS, will serve as president of Combined SJW’s New England Region and of The Connecticut Water Company, an indirect subsidiary of the combined company, from and after the effective time of the merger until December 31, 2020, unless otherwise determined by the affirmative vote of at least 75% of the entire board of directors of the combined company. All of SJW’s and its subsidiaries’ current officers are expected to continue to serve as officers of the combined company or its subsidiaries following the completion of the merger. In addition, the combined company’s and certain of its subsidiaries’ management teams will include officers from CTWS, including as follows: (i) Richard L. Knowlton will serve as president of The Maine Water Company, an indirect subsidiary of the combined company; (ii) Kristen A. Johnson will serve as chief human resource officer of the combined company and its subsidiaries; (iii) Maureen P. Westbrook will serve as senior vice president of external affairs of the combined company and its subsidiaries; (iv) Craig J. Patla will serve as vice president, operations of the Combined SJW’s New England Region; and (v) Robert J. Doffek will serve as vice president, controller of the Combined SJW’s New England Region.

Messrs. Benoit and Patla and Mesdames Johnson and Westbrook are parties to employment agreements that will become effective upon the closing of the merger. Under these employment agreements, each of Messrs. Benoit and Patla and Mesdames Johnson and Westbrook is entitled to severance benefits that are more fully described under “Interests of CTWS Directors and Executive Officers in the Merger — Employment Agreements” and are triggered if his or her employment is terminated, at any time during the term of the employment agreement, for any reason other than cause, death, or attainment of age 65, or if the executive’s employment is terminated by reason of the executive’s disability, or if the executive voluntarily terminates employment for good reason. Notably, with respect to Mr. Benoit and Ms. Westbrook, “good reason” to terminate their employment includes any reason or no reason during the first 13 months following the closing of the merger. Accordingly, under these agreements, key executives potentially could resign from employment following the merger. In addition, the CTWS equity awards held by the CTWS executive officers will be entitled to special treatment pursuant to the terms of the merger agreement, as is more fully described under “The Merger Agreement — Treatment of CTWS Equity Awards.” The payouts under these equity awards could make retention of these key executives more challenging.

The SJW and CTWS boards of directors were aware of these interests at the time each approved the merger and the other transactions contemplated by the merger agreement. These interests, including the continued employment of certain executive officers of SJW and CTWS by the combined company, Mr. Thornburg’s ownership of 25,749 shares of CTWS common stock and 126,662 CTWS DSUs, the continued positions of

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certain directors of SJW and CTWS as directors of the combined company and the indemnification of former directors and officers by the combined company, may cause SJW’s and CTWS’s directors and executive officers to view the merger proposal differently and more favorably than you may view it. See the section entitled “The Merger — Interests of SJW Directors and Executive Officers in the Merger” beginning on page 100 of this joint proxy statement/prospectus and “The Merger — Interests of CTWS Directors and Executive Officers in the Merger” beginning on page 101 of this joint proxy statement/prospectus for more information.

Risk Factors Relating to the Combined Company Following the Merger

The combined company may be unable to integrate successfully the businesses of SJW and CTWS and realize the anticipated benefits of the merger on the anticipated timeframe or at all.

The merger involves the combination of two companies that currently operate as independent public companies. The success of the merger will depend, in large part, on the ability of the combined company to realize the anticipated benefits from combining the businesses of SJW and CTWS. To realize these anticipated benefits, the businesses of SJW and CTWS must be successfully integrated. This integration will be complex and time consuming. The failure to integrate successfully and to manage successfully the challenges presented by the integration process may result in the combined company not fully achieving the anticipated benefits of the merger. Potential difficulties the combined company may encounter as part of the integration process include the following:

The future results of the combined company will suffer if the combined company does not effectively manage its expanded operations following the merger.

Following the merger, the size of the business of the combined company will increase significantly beyond the current size of either SJW’s or CTWS’s business. The combined company’s future success depends, in part,

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upon its ability to manage this expanded business, which will pose substantial challenges for management, including challenges related to the management and monitoring of new operations and associated increased costs and complexity. There can be no assurances that the combined company will be successful or that it will realize the expected operating efficiencies, revenue enhancements and other benefits currently anticipated from the merger.

The merger may not be accretive and may cause dilution to the combined company’s earnings per share, which may negatively affect the market price of the combined company’s common stock.

SJW and CTWS currently anticipate that the merger will result in mid-to-high single-digit accretion on an earnings per share basis to CTWS shareholders immediately and to shareholders of both companies by the second full year. This expectation is based on preliminary estimates, which may materially change. The combined company could also encounter additional transaction and integration-related costs or other factors such as the failure to realize all of the benefits anticipated in the merger. All of these factors could cause dilution to the combined company’s adjusted earnings per share or decrease or delay the expected accretive effect of the merger and cause a decrease in the market value of the combined company’s common stock.

The combined company is expected to incur substantial expenses related to the merger and the integration of SJW and CTWS.

The combined company is expected to incur substantial expenses in connection with the merger and the integration of SJW and CTWS. There are a large number of processes, policies, procedures, operations, technologies and systems at each company that must be integrated, including accounting and finance, payroll, revenue management, commercial operations, risk management, and employee benefits. While SJW and CTWS have assumed that a certain level of expenses would be incurred, there are many factors beyond their control that could affect the total amount or the timing of the integration expenses. Moreover, many of the expenses that will be incurred are, by their nature, difficult to estimate accurately. These expenses could, particularly in the near term, exceed the benefits that the combined company expects to achieve from the elimination of duplicative public company and other related costs expected from the transaction. These integration expenses likely will result in the combined company taking significant charges against earnings following the completion of the merger, and the amount and timing of such charges are uncertain at present. Substantial expenses related to the transaction, including fees payable to the companies’ advisors, will also be borne by SJW and CTWS even if the merger is not completed.

The unaudited pro forma condensed combined financial information included in this joint proxy statement/prospectus are not intended to be representative of the combined company’s results after the merger.

The unaudited pro forma condensed combined financial information included in this joint proxy statement/prospectus is presented solely for informational purposes and is not intended to be indicative of the financial position or results of operations that actually would have occurred had the merger been completed as of the dates indicated, nor is it indicative of the future operating results or financial position of the combined company following the merger. This unaudited pro forma condensed combined financial information reflects adjustments that were developed using preliminary estimates based on available information and various assumptions and may be revised as additional information becomes available. Accordingly, the final acquisition accounting adjustments may differ materially from the pro forma adjustments reflected in this joint proxy statement/prospectus.

Current holders of SJW common stock and CTWS common stock will have a reduced ownership and voting interest after the merger and will exercise less influence over management.

Current holders of SJW common stock and CTWS common stock have the right to vote in the election of the board of directors and on other matters affecting SJW and CTWS, respectively. Upon the completion of the

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merger, each CTWS shareholder who receives shares of SJW common stock will become a stockholder of the combined company with a percentage ownership of the combined company that is smaller than such stockholder’s percentage ownership of CTWS. Similarly, after completion of the merger, the shares of combined company common stock retained by each SJW stockholder will represent a smaller percentage ownership of the combined company. It is currently expected that the shareholders of CTWS immediately prior to the effective time of the merger as a group will receive shares in the merger constituting approximately 40% of the shares of combined company common stock on a fully diluted basis immediately after the merger. As a result, stockholders of SJW immediately prior to the effective time of the merger as a group will own approximately 60% of the shares of combined company common stock on a fully diluted basis immediately after the merger. Because of this, current holders of SJW common stock and CTWS common stock will have less influence on the management and policies of the combined company than they now have on the management and policies of SJW and CTWS, respectively.

The merger will result in changes to the board of directors that may affect the strategy and operations of the combined company.

In connection with the consummation of the merger, the board of directors of the combined company will be expanded to consist of twelve members, which will be comprised of seven of the directors of SJW immediately prior to the effective time of the merger and five of the directors of CTWS immediately prior to the effective time of the merger, as more fully described in the section entitled “ — Governance Matters After the Merger” beginning on page 130 of this joint proxy statement/prospectus. Unless otherwise determined by the affirmative vote of at least 75% of the entire board of directors of the combined company, such board composition will continue until the termination of the term of office that commences upon the close of the annual stockholders meeting at which directors of combined company are elected during the calendar year ended December 31, 2020. This new composition of the board of directors may affect the combined company’s business strategy and operating decisions following the completion of the merger.

The merger will combine two companies that are currently affected by developments in the water utility industry, including changes in regulation. A failure to adapt to the changing regulatory environment after the merger could adversely affect the stability of the combined company’s earnings.

Because SJW, CTWS and their respective subsidiaries are regulated in the U.S. at the federal level and, in the case of SJW, in California and Texas, and, in the case of CTWS, Connecticut and Maine, the two companies have been and will continue to be affected by legislative and regulatory developments. After the merger, the combined company and/or its subsidiaries will be subject in the U.S. to extensive federal regulation as well as to state regulation in the states in which the combined company will operate. The costs and burdens associated with complying with these regulatory jurisdictions may have an adverse effect on the combined company. Moreover, potential legislative changes, regulatory changes or otherwise may create greater risks to the stability of the combined company’s earnings generally.

The rights of CTWS shareholders who become stockholders of the combined company in the merger will be governed by Delaware law, the combined company’s certificate of incorporation and the combined company’s bylaws.

CTWS shareholders who receive shares of SJW common stock in the merger will become stockholders of the combined company and their rights as stockholders will be governed by Delaware law, the combined company’s certificate of incorporation and the combined company’s bylaws, rather than Connecticut law, CTWS’s certificate of incorporation and CTWS’s bylaws. There may be material differences between the current rights of CTWS shareholders, as compared to the rights they will have as stockholders of the combined company. For more information, see the section entitled “Comparison of Rights of CTWS Shareholders and Combined SJW Stockholders” beginning on page 164 of this joint proxy statement/prospectus.

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The combined company’s dividend policy is subject to the discretion of its board of directors and may be limited by the combined company’s credit agreements and limitations under Delaware law.

Although it is currently anticipated that the combined company will pay a regular quarterly dividend following the completion of the merger, any such determination to pay dividends will be at the discretion of the board of directors of the combined company and will be dependent on then-existing conditions, including the company’s financial condition, earnings, legal requirements, including limitations under Delaware law, restrictions in the combined company’s credit agreements that limit its ability to pay dividends to stockholders and other factors the board of directors of the combined company deems relevant. The board of directors of the combined company may, in its sole discretion, change the amount or frequency of dividends or discontinue the payment of dividends entirely. For these reasons, you will not be able to rely on dividends to receive a return on your investment. Accordingly, realization of a gain on your shares of the combined company common stock received in the merger may depend on the appreciation of the price of the combined company common stock, which may never occur.

The market price of shares of SJW common stock may be affected by factors different from those that historically have affected shares of CTWS common stock.

Upon completion of the merger, holders of CTWS common stock will become holders of SJW common stock. The businesses of SJW differ from those of CTWS in certain respects, and, accordingly, the financial position or results of operations and/or cash flows of the combined company after the merger, as well as the market price of shares of SJW common stock, may be affected by factors different from those currently affecting the financial position or results of operations and/or cash flows of CTWS. Following the completion of the merger, CTWS will be part of a larger company with other lines of business and a broader geographic footprint, so decisions affecting CTWS may be made in respect of the larger combined business as a whole rather than the CTWS businesses individually. For a discussion of the businesses of SJW and CTWS and of some important factors to consider in connection with those businesses, see the section entitled “The Companies” beginning on page 43, and the documents incorporated by reference in the section entitled “Where You Can Find More Information” beginning on page 181, including, in particular, in the sections entitled “Risk Factors” in each of SJW’s Annual Report on Form 10-K for the year ended December 31, 2017 and CTWS’s Annual Report on Form 10-K for the year ended December 31, 2017.

The market price of shares of SJW common stock may decline in the future as a result of the sale of shares of SJW common stock held by former CTWS shareholders or current SJW stockholders.

Based on the number of shares of CTWS common stock outstanding as of April 13, 2018 and the number of shares of CTWS common stock that are reserved for issuance pursuant to outstanding CTWS equity awards or otherwise, SJW expects to issue up to approximately 14,194,354 shares of SJW common stock to CTWS shareholders in connection with the merger. Following their receipt of shares of SJW common stock as merger consideration in the merger, former CTWS shareholders may seek to sell the shares of SJW common stock delivered to them. Other SJW stockholders may also seek to sell shares of SJW common stock held by them following, or in anticipation of, completion of the merger. These sales (or the perception that these sales may occur), coupled with the increase in the outstanding number of shares of SJW common stock, may affect the market for, and the market price of, SJW common stock in an adverse manner.

The market price of shares of SJW common stock will continue to fluctuate after the merger.

Upon completion of the merger, holders of CTWS common stock will become holders of shares of SJW common stock. The market price of shares of SJW common stock may fluctuate significantly following completion of the merger and holders of CTWS common stock could lose some or all of the value of their investment in SJW common stock. In addition, the stock market has experienced significant price and volume fluctuations in recent times which, if they continue to occur, could have an adverse effect on the market for, or liquidity of, the SJW common stock, regardless of the combined company’s actual operating performance.

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Other Risk Factors of SJW and CTWS

SJW’s and CTWS’s businesses are and will be subject to the risks described above. In addition, SJW’s and CTWS’s businesses are, and will continue to be, subject to the risks described in Part I, Item 1A in SJW’s Annual Report on Form 10-K for the fiscal year ended December 31, 2017 and Part I, Item 1A in CTWS’s Annual Report on Form 10-K for the fiscal year ended December 31, 2017, each as updated by subsequent Current Reports on Form 8-K, all of which are or will be filed with the SEC and incorporated by reference into this joint proxy statement/prospectus. See the section entitled “Where You Can Find More Information” beginning on page 181 of this joint proxy statement/prospectus for the location of information incorporated by reference in this joint proxy statement/prospectus.

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SUMMARY HISTORICAL CONSOLIDATED FINANCIAL DATA

Summary Historical Consolidated Financial Data of SJW

The following statement of operations data for the years ended December 31, 2017, 2016 and 2015 and the balance sheet data as of December 31, 2017 and 2016 have been derived from the audited consolidated financial statements of SJW contained in its Annual Report on Form 10-K for the fiscal year ended December 31, 2017, which is incorporated into this joint proxy statement/prospectus by reference. The statement of operations data for the years ended December 31, 2014 and 2013 and the balance sheet data as of December 31, 2015, 2014 and 2013 have been derived from SJW’s audited consolidated financial statements for such years, which have not been incorporated into this joint proxy statement/prospectus by reference.

You should read this summary historical financial data together with the financial statements that are incorporated by reference into this joint proxy statement/prospectus and their accompanying notes and management’s discussion and analysis of financial condition and results of operations of SJW contained in such reports.

Statement of Operations Data of SJW

(In thousands of U.S. dollars, except per share data)

Balance Sheet Data of SJW

(In thousands of U.S. dollars)

Summary Historical Consolidated Financial Data of CTWS

The following statement of income data for the years ended December 31, 2017, 2016 and 2015 and the balance sheet data as of December 31, 2017 and 2016 have been derived from the audited consolidated financial

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statements of CTWS contained in its Annual Report on Form 10-K for the fiscal year ended December 31, 2017, which is incorporated into this joint proxy statement/prospectus by reference. The statement of income data for the years ended December 31, 2014 and 2013 and the balance sheet data as of December 31, 2015, 2014 and 2013 have been derived from the audited consolidated financial statements of CTWS for such years, which have not been incorporated into this joint proxy statement/prospectus by reference.

You should read this summary historical financial data together with the financial statements that are incorporated by reference into this joint proxy statement/prospectus and their accompanying notes and management’s discussion and analysis of financial condition and results of operations of CTWS contained in such reports.

Statement of Income Data of CTWS

(In thousands of U.S. dollars, except per share data)

Balance Sheet Data of CTWS⁽¹⁾

(In thousands of U.S. dollars)

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SELECTED UNAUDITED PRO FORMA CONDENSED COMBINED

FINANCIAL INFORMATION OF SJW AND CTWS

The following table shows selected unaudited pro forma condensed combined financial information regarding the financial condition and results of operations of SJW after giving effect to the merger with CTWS. The selected unaudited pro forma combined financial statements have been prepared using the acquisition method of accounting for business combinations pursuant to the provisions of ASC Topic 805, Business Combinations and otherwise in accordance with United States generally accepted accounting principles (“U.S. GAAP”) under which the assets and liabilities of CTWS will be recorded by SJW at their respective fair values as of the date the merger is completed. The selected unaudited pro forma condensed combined balance sheet as of December 31, 2017 assumes that the merger took place on December 31, 2017. The selected unaudited pro forma condensed combined statement of operations for the fiscal year ended December 31, 2017 assumes that the merger took place on January 1, 2017, the beginning of the earliest period presented.

The selected unaudited pro forma condensed combined financial information has been derived from and should be read in conjunction with the more detailed unaudited pro forma combined financial statements of the combined company appearing elsewhere in this joint proxy statement/prospectus and the accompanying notes to the unaudited pro forma combined financial statements. See the section entitled “Unaudited Pro Forma Condensed Combined Financial Information” beginning on page 146 of this joint proxy statement/prospectus. In addition, the selected unaudited pro forma combined financial statements should be read in conjunction with the historical consolidated financial statements and related notes of both SJW and CTWS for the applicable periods, which have been incorporated in this joint proxy statement/prospectus by reference. See the section entitled “Where You Can Find More Information” beginning on page 181 of this joint proxy statement/prospectus.

The selected unaudited pro forma condensed combined financial information has been presented for informational purposes only. The selected unaudited pro forma condensed combined financial information is not necessarily indicative of what the combined company’s financial position or results of operations actually would have been had the merger been completed as of the dates indicated. In addition, the selected unaudited pro forma condensed combined financial information does not purport to project the future financial position or operating results of the combined company. The pro forma information, although helpful in illustrating the financial characteristics of the combined company under one set of assumptions, does not reflect the benefits of expected elimination of duplicative public company and other related costs, opportunities to earn additional revenue, the impact of restructuring, or other factors that may result as a consequence of the merger and, accordingly, does not attempt to predict or suggest future results.

Selected Unaudited Pro Forma Combined Statement of Operations

(In thousands of US dollars, except per share data)

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Selected Unaudited Pro Forma Combined Balance Sheet

(in thousands of US dollars, except per share data)

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UNAUDITED COMPARATIVE PER SHARE DATA

Presented below are SJW’s and CTWS’s historical and pro forma per share data for the year ended December 31, 2017. Except for the historical information for the year ended December 31, 2017, the information provided in the table below is unaudited. This information should be read together with the historical consolidated financial statements and related notes of SJW and CTWS that are filed by SJW and CTWS with the SEC, and incorporated by reference in this joint proxy statement/prospectus, and with the unaudited pro forma condensed combined financial information included in the section entitled “Unaudited Pro Forma Condensed Combined Financial Information” beginning on page 146.

The pro forma information is presented for illustrative purposes only and is not necessarily indicative of the operating results or financial position that would have occurred if the merger had been completed as of the beginning of the periods presented, nor is it necessarily indicative of the future operating results or financial position of the combined company. The pro forma information, although helpful in illustrating the financial characteristics of the combined company under one set of assumptions, does not reflect the benefits of opportunities to earn additional revenue, the impact of restructuring, or other factors that may result as a consequence of the merger and, accordingly, does not attempt to predict or suggest future results.

The historical book value per share is computed by dividing stockholders’ equity by the number of shares of common stock outstanding at the end of the period. The pro forma earnings per share of the combined company is computed by dividing the pro forma earnings by the pro forma weighted average number of shares outstanding. The pro forma book value per share of the combined company is computed by dividing total pro forma stockholders’ equity by the pro forma number of shares of common stock outstanding at the end of the period. The pro forma book value per share of the combined company is computed as if the merger had been completed on December 31, 2017. The CTWS unaudited pro forma equivalent per share financial information is determined using the pro forma combined per share data multiplied by 1.1375 (the exchange ratio of SJW common stock per outstanding share of CTWS common stock).

Comparative Historical and Unaudited Pro Forma Per Share Financial Data

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THE COMPANIES

SJW Group

SJW was incorporated in California as “SJW Corp.” on February 8, 1985. On November 15, 2016, SJW Corp. changed its state of incorporation to the state of Delaware and changed its name to “SJW Group.” SJW is a holding company that conducts its business in the United States through three wholly owned subsidiaries, namely, San Jose Water Company, SJWTX, Inc., doing business as Canyon Lake Water Service Company, and SJW Land Company. San Jose Water Company and Canyon Lake Water Service Company are public utilities regulated by the California Public Utilities Commission and Public Utilities Commission of Texas, respectively, and operate within a service area approved by the regulators.

San Jose Water Company is a public utility that provides water service to approximately 230,000 connections serving a population of approximately one million people in an area comprising approximately 139 square miles in the metropolitan San Jose, California area. SJWTX, Inc. is another public utility that provides water service to approximately 14,000 connections serving approximately 42,000 people in an area comprising more than 244 square miles in western Comal County and southern Blanco County in the growing region between San Antonio and Austin, Texas. In addition, SJWTX, Inc. has a 25% interest in Acequia Water Supply Corporation, which has been consolidated with SJWTX, Inc. within the scope of Financial Accounting Standards Board ASC Topic 810, “Consolidation.” The principal business of these water utility services consists of the production, purchase, storage, purification, distribution, wholesale, and retail sale of water. San Jose Water Company also provides non-tariffed services under agreements with municipalities and other utilities. These non-tariffed services include water system operations, maintenance agreements and antenna site leases.

SJW Land Company owns an undeveloped real estate property, commercial and warehouse properties in Tennessee. SJW Land Company also has a 70% limited partnership interest in 444 West Santa Clara Street, L.P., which sold all of its interests in the commercial building and land the partnership owned and operated on April 6, 2017.

SJW’s common stock is traded on the NYSE under the symbol “SJW.” The principal executive offices of SJW are located on 110 West Taylor Street, San Jose, California 95110. Its telephone number is (408) 279-7800, and its Internet address is www.sjwgroup.com.

Connecticut Water Service, Inc.

CTWS was incorporated in 1974, with The Connecticut Water Company as its largest subsidiary, which was organized in 1956. CTWS is a non-operating holding company, whose income is derived from the earnings of its six wholly owned subsidiary companies. In 2017, approximately 95% of the company’s net income was attributable to water operations carried out within its four regulated water companies, The Connecticut Water Company, The Heritage Village Water Company, The Avon Water Company and The Maine Water Company. The Connecticut Water Company, The Heritage Village Water Company and The Avon Water Company are regulated by the PURA and The Maine Water Company is regulated by the MPUC. These regulated companies supplied water to 135,000 connections serving approximately 450,000 people in 80 municipalities in Connecticut and Maine and wastewater to more than 3,000 connections serving approximately 10,000 people in Southbury, Connecticut. They are subject to state regulation regarding financial issues, rates, service and operating issues, and to various other state and federal regulatory agencies concerning water quality and environmental standards.

In addition to its regulated companies, CTWS owns two active unregulated companies. In 2017, these unregulated companies, together with real estate transactions within The Connecticut Water Company, contributed the remaining 5% of CTWS’s net income through real estate transactions as well as services and rentals. The two active unregulated companies are Chester Realty, Inc., a real estate company in Connecticut, and New England Water Utility Services, Inc., which provides contract water and sewer operations and other water related services.

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CTWS’s common stock is traded on the NASDAQ under the symbol “CTWS.” The principal executive offices of CTWS are located on 93 West Main Street, Clinton, Connecticut 06413. Its telephone number is (860) 669-8636, and its Internet address is www.ctwater.com.

Hydro Sub, Inc.

Hydro Sub, Inc., a wholly owned subsidiary of SJW (“Merger Sub”), is a Connecticut corporation that was formed on March 9, 2018 for the sole purpose of effecting the merger. In the merger, Merger Sub will be merged with and into CTWS, with CTWS surviving as a wholly owned subsidiary of SJW.

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THE SJW SPECIAL MEETING

This joint proxy statement/prospectus is being provided to the stockholders of SJW as part of a solicitation of proxies by the SJW board of directors for use at SJW’s special meeting to be held at the time and place specified below and at any properly convened meeting following any adjournments or postponements thereof. This joint proxy statement/prospectus provides stockholders of SJW with the information they need to know to be able to vote or instruct their vote to be cast at SJW’s special meeting.

Date, Time and Place

The special meeting of SJW stockholders is scheduled to be held at 110 West Taylor Street, San Jose, California 95110, on [●], 2018, at [●], local time, subject to any adjournments or postponements thereof.

Purpose of the SJW Special Meeting

At the SJW special meeting, SJW stockholders will be asked to consider and vote on:

Completion of the merger is conditioned on, among other things, approval of the issuance of shares of SJW common stock to CTWS shareholders pursuant to the merger and the adoption of the SJW certificate of incorporation amendment by SJW stockholders.

Recommendation of the SJW Board of Directors

The SJW board of directors unanimously approved the merger agreement and determined that the merger agreement and the transactions contemplated thereby, including the merger, are advisable and in the best interests of SJW and its stockholders.

The SJW board of directors unanimously recommends that SJW stockholders vote “FOR” the proposal to approve the issuance of shares of SJW common stock to CTWS shareholders pursuant to the merger, “FOR” the proposal to adopt the SJW certificate of incorporation amendment and “FOR” the proposal to approve any motion to adjourn the SJW special meeting, if necessary or appropriate, to solicit additional proxies if there are not sufficient votes to approve the issuance of shares of SJW common stock to CTWS shareholders pursuant to the merger or the adoption of the SJW certificate of incorporation amendment.

SJW Record Date; Stockholders Entitled to Vote

Only SJW stockholders of record at the close of business on [●], 2018, the SJW record date for the SJW special meeting, are entitled to notice of, and to vote at, the SJW special meeting or any adjournments or postponements thereof.

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At the close of business on the SJW record date, there were [●] shares of SJW common stock outstanding and entitled to vote at the SJW special meeting. SJW issued and outstanding capital stock consists solely of outstanding shares of SJW common stock. SJW stockholders will have one vote for each share of SJW common stock they owned on the SJW record date, in person or through the Internet or by telephone or by a properly executed and delivered proxy with respect to the SJW special meeting. A list of stockholders of SJW will be available for review for any purpose germane to the special meeting at SJW’s executive offices and principal place of business at the 110 West Taylor Street, San Jose, California 95110, during regular business hours for a period of 10 days before the special meeting. The list will also be available at the special meeting for examination by any stockholder of record present at the special meeting.

Voting by SJW’s Directors and Executive Officers

At the close of business on the SJW record date, directors and executive officers of SJW and their affiliates were entitled to vote [●] shares of SJW common stock, or approximately [●]% of the shares of SJW common stock outstanding on that date. We currently expect that SJW’s directors (including those who are party to the SJW voting and support agreements) and executive officers will vote their shares in favor of the proposal to approve the issuance of shares of SJW common stock to CTWS shareholders pursuant to the merger and the proposal to adopt the SJW certificate of incorporation amendment.

Quorum

No business may be transacted at the SJW special meeting unless a quorum is present. Stockholders who hold shares representing at least a majority of the voting power of all shares of SJW stock issued and outstanding and entitled to vote at the SJW special meeting must be present in person or represented by proxy to constitute a quorum for the transaction of business at the SJW special meeting. If a quorum is not present, the special meeting may be adjourned by the approval of holders of SJW stock representing a majority of the voting power of all shares present in person or represented by proxy at the special meeting, or by the chairman of the special meeting, to allow additional time for obtaining additional proxies. In addition, the chairman of the special meeting may adjourn such meeting after the special meeting has been duly organized. At any subsequent reconvening of the special meeting, all proxies will be voted in the same manner as they would have been voted at the original convening of the special meeting, except for any proxies that have been effectively revoked or withdrawn prior to the subsequent meeting.

For purposes of determining whether a quorum has been achieved, abstentions (shares of SJW common stock for which proxies have been received but for which the holders have abstained from voting or as to which the holder attends the special meeting in person but does not vote) will be included in the calculation of the number of shares of SJW common stock represented at the special meeting, but broker non-votes will not be included.

Required Vote

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Completion of the merger is conditioned on, among other things, approval of the issuance of shares of SJW common stock to CTWS shareholders pursuant to the merger and the adoption of the SJW certificate of incorporation amendment by SJW stockholders.

Failure to Vote, Broker Non-Votes and Abstentions

Failure to Vote. A failure to vote occurs when a holder of SJW common stock fails to vote in person or by proxy and fails to instruct his or her bank, broker, trust or other nominee to vote shares beneficially owned by such holder. Accordingly, if an SJW stockholder fails to vote with respect to:

Broker Non-Votes. If you hold your SJW shares in a stock brokerage account or if your shares are held by a bank, broker, trustee or other nominee (that is, in “street name”), you must provide the record holder of your shares with instructions on how to vote your shares. Please follow the voting instructions provided by your bank, broker, trustee or other nominee. Please note that you may not vote shares held in “street name” by returning a proxy card directly to SJW or by voting in person at your stockholders meeting unless you have a “legal proxy,” which you must obtain from your bank or broker. Further, brokers who hold shares of SJW common stock on behalf of their customers may not give a proxy to SJW to vote those shares without specific instructions from their customers. If you are an SJW stockholder and you do not instruct your broker on how to vote your shares, pursuant to the rules of the NYSE, your broker may not vote your shares on:

Abstentions. An abstention occurs when an SJW stockholder attends the SJW special meeting, either in person or by proxy, but abstains from voting. An abstention of any SJW stockholder with respect to each of the proposals to approve the issuance of shares of SJW common stock to CTWS shareholders pursuant to the merger, the proposal to approve adoption of the SJW certificate of incorporation amendment and a proposal to adjourn the SJW special meeting will have the same effect as a vote against such proposal.

Voting at the Special Meeting In Person

Whether or not you plan to attend the SJW special meeting, please vote your shares in advance of the meeting by proxy by following the instructions set forth in the section below.

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If you plan to attend the SJW special meeting and wish to vote in person, you will be given a ballot at the special meeting.

If you are a registered or “record” holder, which means your shares are registered in your name with American Stock Transfer & Trust Company, SJW’s transfer agent, you may vote in person at the special meeting. In addition, if you are a registered stockholder, please be prepared to provide proper identification, such as a driver’s license.

If your shares are held in “street name” and you wish to vote at the special meeting, you must bring to the special meeting a proxy executed in your favor from the record holder (your broker, bank or other nominee) of the shares authorizing you to vote at the special meeting. You will need to provide proof of ownership, such as a recent account statement or letter from your bank, broker or other nominee, along with proper identification.

Voting at the Special Meeting by Proxy

If you are a holder of record, a proxy card is enclosed for your use. SJW requests that you submit a proxy via the Internet by logging onto www.proxyvote.com and following the instructions on your proxy card or by telephone by dialing (866) 357-4029 and listening for further directions or by signing and dating the enclosed proxy and returning it promptly in the enclosed postage-paid envelope. When the enclosed proxy is returned properly executed and dated, the shares of SJW common stock represented by it will be voted at the SJW special meeting or any adjournment or postponement thereof in accordance with the instructions contained in the proxy.

If a proxy is returned without an indication as to how the shares of SJW common stock represented are to be voted with regard to a particular proposal, the SJW common stock represented by the proxy will be voted in accordance with the recommendation of the SJW board of directors and, therefore, “FOR” the proposal to approve the issuance of shares of SJW common stock to CTWS shareholders pursuant to the merger, “FOR” the proposal to adopt the SJW certificate of incorporation amendment and “FOR” the proposal to approve any motion to adjourn the SJW special meeting, if necessary or appropriate, to solicit additional proxies if there are not sufficient votes to approve the issuance of shares of SJW common stock to CTWS shareholders pursuant to the merger or the adoption of the SJW certificate of incorporation amendment. At the date hereof, management has no knowledge of any business that will be presented for consideration at the special meeting and which would be required to be set forth in this joint proxy statement/prospectus or the related proxy card other than the matters set forth in SJW’s Notice of Special Meeting of Stockholders. If any other matter is properly presented at the special meeting for consideration, it is intended that the persons named in the enclosed form of proxy and acting thereunder will vote in accordance with their best judgment on such matter.

If you hold your shares of SJW common stock in “street name”, you will receive instructions from your broker, bank or other nominee that you must follow in order to vote your shares. If you vote by Internet or telephone, you need not return a proxy card by mail, but your vote must be received by 11:59 p.m., Eastern time, on [●], 2018.

Your vote is important. Accordingly, please sign and return the enclosed proxy card whether or not you plan to attend the SJW special meeting in person. Proxies submitted through the specified Internet website or by phone must be received by 11:59 p.m., Eastern time, on [●], 2018.

Revocation of Proxies

If you are the record holder of SJW stock, you can change your vote or revoke your proxy at any time before your proxy is voted at the special meeting. You can do this by:

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A registered stockholder may revoke a proxy by any of these methods, regardless of the method used to deliver the stockholder’s previous proxy.

Written notices of revocation and other communications with respect to the revocation of proxies should be addressed as follows:

SJW Group

110 West Taylor Street

San Jose, California 95110

Attention: General Counsel and Corporate Secretary

Please note that if your shares are held in “street name” through a broker, bank, employee benefit plan trustee or other nominee, you may change your vote by submitting new voting instructions to your broker, bank or other nominee in accordance with its established procedures. If your shares are held in the name of a broker, bank, employee benefit plan trustee or other nominee and you decide to change your vote by attending the special meeting and voting in person, your vote in person at the special meeting will not be effective unless you have obtained and present an executed proxy issued in your name from the record holder (your broker, bank or other nominee).

Tabulation of Votes

SJW expects to appoint one or more independent contractors retained by Georgeson LLC (“Georgeson”) to serve as the Inspector of Election for the SJW special meeting. Georgeson will independently tabulate affirmative and negative votes and abstentions.

Solicitation of Proxies

SJW is soliciting proxies for the SJW special meeting and, in accordance with the merger agreement, the cost of SJW proxy solicitation will be borne by SJW. In addition to solicitation by use of mails, proxies may be solicited by SJW directors, officers and employees in person or by telephone or other means of communication. These individuals will not be additionally compensated but may be reimbursed for out-of-pocket expenses associated with solicitation. Arrangements will also be made with brokers, banks, trustees and other nominees for forwarding of proxy solicitation material to beneficial owners of common stock held of record and we may reimburse these individuals for their reasonable expenses.

To help assure the presence in person or by proxy of the largest number of stockholders possible, SJW has engaged Georgeson, a proxy solicitation firm, to solicit proxies on SJW’s behalf. SJW has agreed to pay Georgeson a proxy solicitation fee of $50,000, plus reasonable expenses for its services. SJW will also reimburse Georgeson for its reasonable out-of-pocket costs and expenses.

Adjournments

Any adjournment of the special meeting may be made from time to time, if a quorum does not exist, by approval holders of SJW stock representing a majority of the voting power of all shares present in person or represented by proxy at the special meeting, or by the chairman of the special meeting, without further notice other than by an announcement made at the special meeting. In addition, the chairman of the special meeting may adjourn such meeting after the special meeting has been duly organized. If a quorum is not present at the special meeting, or if a quorum is present at the special meeting but there are not sufficient votes at the time of the special meeting to approve the proposal to issue shares of SJW common stock to CTWS shareholders or the proposal to adopt the SJW certificate of incorporation amendment, then SJW stockholders may be asked to vote on the proposal to adjourn the special meeting so as to permit the further solicitation of proxies.

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THE CTWS SPECIAL MEETING

This joint proxy statement/prospectus is being provided to CTWS shareholders as part of a solicitation of proxies by the CTWS board of directors for use at the CTWS special meeting to be held at the time and place specified below and at any properly convened meeting following any adjournments or postponements thereof. This joint proxy statement/prospectus provides CTWS shareholders with the information they need to know to be able to vote or instruct their vote to be cast at the CTWS special meeting.

Date, Time and Place

The special meeting of CTWS shareholders is scheduled to be held at [●] on [●], 2018 at [●], local time, subject to any adjournments or postponements thereof.

Purpose of the CTWS Special Meeting

At the CTWS special meeting, CTWS shareholders will be asked to consider and vote on:

Completion of the merger is conditioned on, among other things, approval of the merger agreement by CTWS shareholders.

Recommendation of the CTWS Board of Directors

The CTWS board of directors unanimously (i) determined that the merger agreement and the consummation of the transactions contemplated thereby, including the merger, are in the best interests of CTWS and its shareholders, (ii) declared advisable the merger agreement and the transactions contemplated thereby, including the merger, and (iii) approved and adopted the merger agreement and the transactions contemplated thereby, including the merger.

The CTWS board of directors unanimously recommends that CTWS shareholders vote “FOR” the proposal to approve the merger agreement, “FOR” the proposal to approve, on a non-binding advisory basis, specific compensatory arrangements between CTWS and its named executive officers relating to the merger and “FOR” the proposal to adjourn the CTWS special meeting, if necessary or appropriate, to solicit additional proxies if there are not sufficient votes to approve the merger agreement.

CTWS Record Date; Shareholders Entitled to Vote

Only holders of record of CTWS common stock at the close of business on [●], 2018, the CTWS record date, will be entitled to notice of, and to vote at, the CTWS special meeting or any adjournments or postponements thereof.

At the close of business on the CTWS record date, [●] shares of CTWS common stock were issued and outstanding and held by [●] holders of record. As of the CTWS record date, CTWS issued and outstanding capital stock consists solely of outstanding shares of CTWS common stock. Holders of record of CTWS common

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stock on the CTWS record date are entitled to three votes per share at the CTWS special meeting on each proposal. A list of CTWS shareholders will be available for review for any purpose germane to the CTWS special meeting at CTWS’s executive offices and principal place of business at 93 West Main Street, Clinton, Connecticut 06413, during regular business hours for a period of 10 days before the CTWS special meeting. The list will also be available at the CTWS special meeting for examination by any shareholder of record present at the CTWS special meeting.

Voting by CTWS’s Directors and Executive Officers

At the close of business on the CTWS record date, directors and executive officers of CTWS and their affiliates were entitled to vote [●] shares of CTWS common stock, or approximately [●] of the shares of CTWS common stock outstanding on that date. We currently expect that CTWS’s directors and executive officers will vote their shares in favor of each proposal being submitted to a vote of CTWS shareholders at the CTWS special meeting, although no director or officer has entered into any agreement obligating him or her to do so.

Quorum

No business may be transacted at the CTWS special meeting unless a quorum is present. Shareholders who hold shares representing at least a majority of the shares of common stock issued and outstanding as of the close of business on the CTWS record date and entitled to vote at the CTWS special meeting must be present in person or represented by proxy to constitute a quorum for the transaction of business at the meeting. If a quorum is not present at the CTWS special meeting, the shareholders present in person or by proxy may adjourn to such future time as shall be agreed upon by them, and notice of such adjournment shall be given to the shareholders not present or represented at the meeting.

Abstentions and broker non-votes will be included in the calculation of the number of shares of CTWS common stock represented at the special meeting for purposes of determining whether a quorum has been achieved.

Required Vote

Approval of the merger agreement requires the affirmative vote of holders of two-thirds (66 2/3 %) of the outstanding shares of CTWS common stock entitled to vote on the proposal. Abstentions, failures to vote and broker non-votes will have the effect of a vote against this proposal, assuming a quorum is present.

Approval, on a non-binding advisory basis, of specific compensatory arrangements between CTWS and its named executive officers relating to the merger requires that the votes favoring the action cast by the shareholders entitled to vote thereon exceed the votes opposing the action cast by the shareholders entitled to vote thereon, although such vote will not be binding on CTWS or its board of directors or any of its committees. Abstentions, failures to vote and broker non-votes will have no effect on this proposal, assuming a quorum is present.

Approval of the proposal to adjourn the CTWS special meeting, if necessary or appropriate, to solicit additional proxies if there are not sufficient votes to approve the merger agreement requires that the votes favoring the action cast by the shareholders entitled to vote thereon exceed the votes opposing the action cast by such shareholders. Abstentions, failures to vote and broker non-votes will have no effect on this proposal, assuming a quorum is present.

Completion of the merger is conditioned on, among other things, approval of the merger agreement by CTWS shareholders.

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Failure to Vote; Broker Non-Votes and Abstentions

Failure to Vote. A failure to vote occurs when a holder of CTWS common stock fails to vote in person or by proxy and fails to instruct his or her bank, broker, trust or other nominee to vote shares beneficially owned by such holder. Accordingly, if a CTWS shareholder fails to vote with respect to:

Broker Non-Votes. Under the rules of the NYSE (which effectively govern the voting by any brokerage firm holding shares registered in its name or in the name of its nominee on behalf of a beneficial owner), banks, brokers, trusts or other nominees holding shares of record may vote those shares in their discretion on certain routine proposals when they do not receive timely voting instructions from the beneficial holders. A “broker non-vote” occurs under these NYSE rules when a bank, broker, trust or other nominee holding shares of record is not permitted to vote on a non-routine matter without instructions from the beneficial owner of the shares and no instruction is given.

In accordance with these NYSE rules, banks, brokers and other nominees who hold shares of CTWS common stock in “street name” for their customers, but do not have discretionary authority to vote the shares, may not exercise their voting discretion with respect to the proposals to be voted on at the CTWS special meeting. Accordingly, if banks, brokers or other nominees do not receive specific voting instructions from the beneficial owner of such shares, they may not vote such shares with respect to the proposals. For shares of CTWS common stock held in “street name,” only shares of CTWS common stock affirmatively voted “FOR” the proposals will be counted as a favorable vote for such proposals.

Abstentions. An abstention occurs when a CTWS shareholder attends the CTWS special meeting, either in person or by proxy, but abstains from voting. Abstentions will have the same effect on each proposal as a failure to vote (as described above).

Voting at the Special Meeting In Person

Your vote is important. Whether or not you plan to attend the CTWS special meeting, please vote your shares in advance of the meeting by proxy by following the instructions set forth in the section below.

If you plan to attend the CTWS special meeting and wish to vote in person, you will be given a ballot at the special meeting.

If you are a registered or “record” holder, which means your shares are registered in your name with Broadridge Corporate Issuer Solutions, Inc. (“Broadridge”), CTWS’s transfer agent, you may vote in person at the special meeting. In addition, if you are a registered shareholder, please be prepared to provide proper identification, such as a driver’s license.

If your shares are held in “street name,” which means your shares are held of record in an account with a broker, bank or other nominee, and you wish to vote at the special meeting, you must bring to the special meeting a proxy executed in your favor from the record holder (your broker, bank or other nominee) of the shares authorizing you to vote at the special meeting. You will need to provide proof of ownership, such as a recent account statement or letter from your bank, broker or other nominee, along with proper identification.

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Voting at the Special Meeting by Proxy

If you are a holder of record, a proxy card is enclosed for your use. CTWS requests that you submit a proxy via the Internet by logging onto www.proxyvote.com and following the instructions on your proxy card or by telephone by dialing (800) 454-8683 and listening for further directions. Shareholders of record of CTWS may also submit their proxies through the mail by completing the enclosed proxy card, and signing, dating and returning it in the enclosed, pre-addressed, postage-paid envelope. To be valid, a returned proxy card must be signed and dated. You should submit your proxy in advance of the meeting even if you plan to attend the CTWS special meeting. You can always change your vote at the special meeting.

If you hold your shares of CTWS common stock in “street name”, you will receive instructions from your broker, bank or other nominee that you must follow in order to vote your shares. If you vote by Internet or telephone, you need not return a proxy card by mail, but your vote must be received by 11:59 p.m., Eastern time, on [●], 2018.

How Proxies are Counted

All shares represented by properly executed proxies received in time for the CTWS special meeting will be voted at the meeting in the manner specified by the shareholders giving those proxies.

If you properly execute your proxy card but do not indicate how your shares of CTWS common stock should be voted on a matter, the shares of CTWS common stock represented by your proxy will be voted as the CTWS board of directors recommends and, therefore, “FOR” the proposal to approve the merger agreement, “FOR” the proposal to approve, on a non-binding advisory basis, specific compensatory arrangements between CTWS and its named executive officers relating to the merger and “FOR” the proposal to adjourn the CTWS special meeting, if necessary or appropriate, to solicit additional proxies if there are not sufficient votes to approve the merger agreement, assuming a quorum is present.

Only shares affirmatively voted for the proposal, and properly executed proxies that do not contain voting instructions, will be counted as favorable votes for the proposal to approve the merger agreement. Abstentions and broker non-votes will have the same effect as votes against the proposal to approve the merger agreement. Abstentions and broker non-votes will have no effect on the proposals to approve, on a non-binding advisory basis, the specific compensatory arrangements or to adjourn the CTWS special meeting.

Revocation of Proxies

If you are the record holder of CTWS common stock, you can change your vote or revoke your proxy at any time before your proxy is voted at the special meeting. You can do this by:

A registered shareholder may revoke a proxy by any of these methods, regardless of the method used to deliver the shareholder’s previous proxy.

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Written notices of revocation and other communications with respect to the revocation of proxies should be addressed as follows:

Connecticut Water Service, Inc.

93 West Main Street

Clinton, Connecticut 06413

Attention: Corporate Secretary

Please note that if your shares are held in “street name” through a broker, bank or other nominee, you may change your vote by submitting new voting instructions to your broker, bank or nominee in accordance with its established procedures. If your shares are held in the name of a broker, bank or other nominee and you decide to change your vote by attending the special meeting and voting in person, your vote in person at the special meeting will not be effective unless you have obtained and present an executed proxy issued in your name from the record holder (your broker, bank or nominee).

Tabulation of Votes

CTWS expects to appoint one or more representatives of Broadridge to serve as the Inspector of Election for the CTWS special meeting. Broadridge will independently tabulate affirmative and negative votes and abstentions.

Solicitation of Proxies

CTWS is soliciting proxies for its special meeting from its shareholders. CTWS will pay its own cost of soliciting proxies, including the cost of mailing this joint proxy statement/prospectus, from its shareholders. In addition to solicitation by use of the mails, proxies may be solicited by CTWS’s directors, officers and employees in person or by telephone or other means of communication. These persons will not receive additional compensation, but may be reimbursed for actual and reasonable fees and expenses in connection with this solicitation.

CTWS has retained the services of Morrow Sodali LLC to assist in the solicitation of proxies for an estimated fee of $45,000, plus reimbursement of disbursements for actual and reasonable fees and expenses. CTWS will make arrangements with brokerage houses, custodians, nominees and fiduciaries to forward proxy solicitation materials to beneficial owners of shares held of record by them. CTWS will also reimburse these brokerage houses, custodians, nominees and fiduciaries for their reasonable expenses incurred in forwarding the proxy materials.

Adjournments

If a quorum is not present at the CTWS special meeting, the shareholders present in person or by proxy may adjourn to such future time as shall be agreed upon by them, and notice of such adjournment shall be given to the shareholders not present or represented at the meeting. If a quorum is present at the special meeting but there are not sufficient votes at the time of the special meeting to approve the proposal to approve the merger agreement, then CTWS shareholders may be asked to vote on the proposal to adjourn the special meeting so as to permit the further solicitation of proxies.

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THE MERGER

The following is a description of the material aspects of the merger, including the merger agreement. While we believe that the following description covers the material terms of the merger, the description may not contain all of the information that is important to you. We encourage you to read this joint proxy statement/prospectus carefully and in its entirety, including the merger agreement which is included as Annex A to this joint proxy statement/prospectus, for a more complete understanding of the merger.

Effects of the Merger

Upon the terms and subject to the conditions of the merger agreement and in accordance with Connecticut law, at the effective time of the merger, Merger Sub, a wholly owned subsidiary of SJW and a party to the merger agreement, will merge with and into CTWS. CTWS will survive the merger as a wholly owned subsidiary of SJW and, following completion of the merger, is sometimes referred to in this joint proxy statement/prospectus as the combined company’s “New England Region.” The merger will become effective at such time as a certificate of merger has been duly filed with the Secretary of the State of the State of Connecticut or at any later date or time mutually agreed to by SJW and CTWS in writing and specified in the certificate of merger in accordance with Connecticut law.

At the effective time of the merger, each share of CTWS common stock (other than shares of CTWS common stock owned by SJW, Merger Sub, CTWS or any of their respective subsidiaries and not held on behalf of third parties, which will be canceled and retired and cease to exist) issued and outstanding immediately prior to the effective time of the merger, will be converted into the right to receive 1.1375 shares of SJW common stock (the “exchange ratio”), with cash paid in lieu of fractional shares. This exchange ratio will not be adjusted for changes in the market price of either SJW common stock or CTWS common stock between the date of signing of the merger agreement and completion of the merger.

SJW stockholders will not receive any merger consideration and will continue to hold their shares of SJW common stock after the merger.

SJW and CTWS are working to complete the merger as soon as practicable and expect the closing of the merger to occur during the fourth quarter of 2018. However, the merger is subject to various regulatory clearances and the satisfaction or waiver of other conditions, and it is possible that factors outside the control of SJW and CTWS could result in the merger being completed at an earlier time, at a later time or not at all. There may be a substantial amount of time between the SJW and CTWS special meetings and the completion of the merger.

Background of the Merger

From time to time, the CTWS board of directors and CTWS senior management have reviewed and evaluated various strategic alternatives available to CTWS. Among the strategic alternatives evaluated were (i) maintaining CTWS as an independent public company, including making strategic acquisitions, (ii) a business combination with a strategic partner or (iii) a whole-company sale of CTWS. Except as otherwise described below, in recent years none of the matters evaluated in connection with any of the strategic alternatives that involved a transaction with a third party (other than strategic acquisitions by CTWS) has progressed beyond the initial stages.

From time to time, the SJW board of directors and SJW senior management have reviewed and evaluated various strategic alternatives available to SJW. Among the strategic alternatives evaluated were (i) maintaining SJW as an independent public company, including making strategic acquisitions, (ii) a business combination with a strategic partner or (iii) a whole-company sale of SJW. Except as otherwise described below, in recent years none of the matters evaluated in connection with any of the strategic alternatives that involved a transaction with a third party (other than strategic acquisitions by SJW) has progressed beyond the initial stages.

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On June 10, 2016, Mr. Andrew Walters, chief administrative officer of San Jose Water Company, a subsidiary of SJW, approached Mr. Eric W. Thornburg, then chairman, president and chief executive officer of CTWS, to explore the concept of a merger of equals transaction between SJW and CTWS. Messrs. Walters and Thornburg concluded that they would approach their respective boards of directors regarding further exploration of the merger of equals concept.

On August 10, 2016, SJW (after consulting with and obtaining authorization from the SJW board of directors) and CTWS (after consulting with and obtaining authorization from the CTWS board of directors) entered into a mutual confidentiality agreement (the “confidentiality agreement”) to share certain non-public information about their respective businesses. The confidentiality agreement included, among other things, covenants prohibiting SJW and CTWS from soliciting for employment any employee of the other party, or inducing any employee of the other party to terminate such employee’s employment, subject to certain exceptions.

From August 2016 through January 2017, members of the CTWS board of directors and CTWS management, in consultation with and pursuant to authorization from the CTWS board of directors, engaged in in-person and telephonic discussions with members of the SJW board of directors and SJW management, in consultation with and pursuant to authorization from the SJW board of directors, from time to time about various matters relating to a potential transaction, including each company’s culture, the industrial logic of a merger of equals transaction, governance matters for the combined company that would result from such a transaction and financial projections for each company. Throughout this time period, the CTWS board of directors and members of CTWS management evaluated the potential benefits and risks of a merger of equals transaction with SJW and consulted with representatives of Wells Fargo Securities, which was engaged to advise CTWS in connection with its review of strategic alternatives, and Sullivan & Cromwell LLP (“Sullivan & Cromwell”), CTWS’s outside legal counsel. Also throughout this time period, the SJW board of directors and members of SJW management evaluated the potential benefits and risks of a merger of equals transaction with CTWS and consulted with representatives of J.P. Morgan, which was engaged to advise SJW in connection with its review of a possible transaction, and Skadden, Arps, Slate, Meagher & Flom LLP (“Skadden”), SJW’s outside legal counsel.

By January 2017, SJW and CTWS had not agreed to terms upon which they would be willing to conduct a merger of equals transaction, and discussions between SJW and CTWS discontinued.

From November 2016 through May 2017, the CTWS board of directors and members of CTWS management explored another transaction involving the possible acquisition of a large water utility company, which transaction did not occur.

In connection with the retirement of Mr. W. Richard Roth as president and chief executive officer of SJW, SJW engaged in an executive search process. As a part of such search process, which included multiple candidates, Mr. Thornburg met with the nominating and governance committee of the SJW board of directors in June 2017 and the full SJW board of directors in July 2017. In August 2017, the executive compensation committee of the SJW board of directors informed Mr. Thornburg of its interest in discussing the terms upon which SJW might hire Mr. Thornburg to serve as its president and chief executive officer provided that CTWS agrees to waive the non-solicitation provision of the confidentiality agreement for the purpose of SJW’s hiring of Mr. Thornburg.

On August 31, 2017, SJW and CTWS entered into a release and waiver whereby CTWS agreed to waive, solely with respect to SJW’s solicitation and possible or actual employment of Mr. Thornburg, the covenants of the confidentiality agreement which prohibited SJW from soliciting for employment any employee of CTWS. As part of the release and waiver, in the event SJW did employ Mr. Thornburg, SJW agreed to reimburse CTWS for its fees and expenses related to engaging an executive search firm to perform a search for Mr. Thornburg’s replacement and other fees and expenses incident to his replacement, up to $500,000.

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On September 28, 2017, SJW announced that the SJW board of directors had appointed Mr. Thornburg to serve as president and chief executive officer of SJW, effective as of November 6, 2017.

Also on September 28, 2017, CTWS announced the resignation of Mr. Thornburg and that the CTWS board of directors had appointed Mr. David C. Benoit, who was then the senior vice president — finance, chief financial officer and treasurer of CTWS, to serve as the interim president and chief executive officer of CTWS, effective as of September 28, 2017.

In October 2017, the executive vice president and general counsel of Eversource Energy (“Eversource”) contacted Ms. Carol P. Wallace, chairman of the CTWS board of directors, by phone. During the course of their discussion, Ms. Wallace indicated that the CTWS board of directors was pleased with the company’s strategy and results and intended to continue maintaining CTWS as an independent public company.

On November 14, 2017, the SJW board of directors held a meeting with members of SJW management in attendance. During the meeting, the SJW board of directors discussed the possibility of exploring a merger of equals transaction between SJW and CTWS and directed Mr. Thornburg to contact Mr. Benoit in order to assess whether the CTWS board of directors would be interested in discussing such a merger of equals transaction with SJW.

The following day, on November 15, 2017, Mr. Thornburg telephoned Mr. Benoit to inquire as to whether Mr. Benoit and the CTWS board of directors would be interested in receiving a proposal regarding a potential merger of equals transaction with SJW. Following their phone call, Mr. Benoit informed Ms. Wallace and members of CTWS management of his phone call with Mr. Thornburg.

On November 16, 2017, the CTWS board of directors held a special telephonic meeting with members of CTWS management in attendance. During the meeting, Mr. Benoit informed the CTWS board of directors of the phone call from Mr. Thornburg inquiring if the CTWS board of directors would be interested in receiving a proposal for a merger of equals transaction with SJW. Following a discussion about the merits and potential risks and benefits of a return communication to Mr. Thornburg, it was agreed that the CTWS board of directors would continue its discussion at a telephonic meeting to occur the next day on November 17, 2017. Following the CTWS board of directors meeting, Mr. Benoit informed Sullivan & Cromwell of the phone call with Mr. Thornburg and the CTWS board meeting.

On November 17, 2017, the CTWS board of directors held a special telephonic meeting with members of CTWS management in attendance. Following additional discussion regarding the merits and potential risks and benefits of a return communication to Mr. Thornburg, the CTWS board of directors agreed that Mr. Benoit should communicate to Mr. Thornburg that the CTWS board of directors would be open to reviewing a proposal from SJW regarding a merger of equals transaction and would give such a proposal careful consideration, with specific attention to the premium that would be offered in the merger of equals, the governance terms and SJW’s plans and pathway to achieve regulatory approval for the transaction.

Between November 17, 2017 and early December 2017, Messrs. Benoit and Thornburg communicated periodically regarding ongoing internal discussions at CTWS and SJW, respectively, and of potential key issues, including regulatory approval, board composition and merger premium, in connection with submitting a proposal for a potential transaction.

On December 6, 2017, the finance committee of the SJW board of directors (the “SJW finance committee”) held a meeting with members of SJW management and representatives of J.P. Morgan and Skadden in attendance. During the meeting, members of SJW management presented to the SJW finance committee a potential merger of equals transaction with CTWS, which included the possibility of a potential share repurchase to be effective following consummation of the potential transaction. Review of the background, rationale and terms of the potential transaction included its anticipated impact on SJW’s liquidity position, capital cost, ability

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to scale and attractiveness to investors, as well as likely benefits from increased regulatory, geographic and weather diversification. Representatives of J.P. Morgan then presented a financial analysis of the proposed financial terms of the potential transaction and also discussed with the SJW finance committee a potential share repurchase to be effective following consummation of the potential transaction. Members of the SJW finance committee proceeded to engage in a discussion of the potential transaction, following which the SJW finance committee recommended that the full SJW board of directors consider delivering to CTWS an indication of interest letter outlining the potential transaction.

On December 8, 2017, the SJW board of directors held a meeting with members of SJW management and representatives of J.P. Morgan and Skadden in attendance. During the meeting, Mr. Daniel B. More, chairman of the SJW finance committee, provided the SJW board of directors with an update of matters discussed by the SJW finance committee during its December 6 meeting and the SJW finance committee’s recommendation that the SJW board of directors consider delivery to CTWS of an indication of interest letter relating to the potential transaction. Members of SJW management then reviewed the background, rationale and proposed terms of the potential transaction, including a possible accelerated repurchase of shares of SJW common stock to be announced in connection with such potential transaction to take advantage of the combined company’s improved credit profile and optimize the balance sheet, while increasing earnings per share accretion and maintaining a strong investment grade rating. During this discussion, Mr. Thornburg disclosed his ownership of CTWS securities. Representatives of J.P. Morgan presented a financial analysis of the proposed financial terms of the potential transaction and also discussed with the SJW board of directors a potential share repurchase to be effective following consummation of the proposed transaction. In addition, at the meeting, a representative of Skadden reviewed with the members of the SJW board of directors their fiduciary duties in the context of consideration of a strategic transaction. The SJW board of directors unanimously determined that it was in the best interests of the SJW stockholders for Mr. Thornburg, in consultation with SJW’s lead independent director and the chairman of the SJW finance committee, to deliver a letter to, and to enter into non-binding negotiations with, CTWS with respect to the terms of the potential transaction.

Later on December 8, 2017, following the direction of the SJW board of directors, Mr. Thornburg sent Mr. Benoit a non-binding indicative offer (the “proposal”) to acquire all of the outstanding shares of CTWS common stock in a merger of equals transaction at an exchange ratio of 1.0 share of SJW common stock per outstanding share of CTWS common stock. At market close on December 7, 2017, this exchange ratio represented a premium for CTWS shareholders of 11.2% based on the closing share prices of SJW and CTWS and would result in SJW stockholders and CTWS shareholders owning approximately 63% and 37%, respectively, of the outstanding shares of the combined company. The proposal outlined SJW’s belief that the combination of SJW and CTWS would create a leading, diversified North American water utility company with strong positions on the West Coast, in Texas, and in the New England Region. The proposal included SJW’s expectation that the combined company’s board of directors would be comprised of directors from both companies, in numbers commensurate with the pro forma ownership of the current SJW stockholders and CTWS shareholders in the combined company, and that CTWS would designate the lead independent director of the combined company. SJW also proposed that Mr. Thornburg serve as chairman and chief executive officer of the combined company, with current members of CTWS management and CTWS employees playing vital lead roles within the combined company and continuing to lead CTWS’s existing businesses. In addition, the proposal specified that SJW’s current headquarters would remain as corporate headquarters for the combined company and that CTWS’s current headquarters would be retained as the New England headquarters for the combined company.

Following receipt of the proposal, Mr. Benoit informed the CTWS board of directors and CTWS management of the proposal. CTWS management consulted with Sullivan & Cromwell and Wells Fargo Securities regarding appropriate next steps and process, including scheduling a special meeting of the CTWS board of directors on December 15, 2017 and instructing Wells Fargo Securities to assemble preliminary financial analyses regarding the potential transaction.

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On December 13, 2017, Mr. Benoit emailed Mr. Thornburg to update him that a meeting of the CTWS board of directors had been scheduled to discuss and consider the potential transaction and that members of the CTWS management were consulting with Sullivan & Cromwell and Wells Fargo Securities regarding the proposal.

On December 15, 2017, the CTWS board of directors held a special telephonic meeting with members of CTWS management and representatives of Wells Fargo Securities in attendance. During the meeting, representatives of Wells Fargo Securities reviewed with the CTWS board of directors its preliminary financial analyses regarding the proposal, considerations specific to merger of equals transactions and potential next steps (including required due diligence). The CTWS board of directors then discussed with the members of CTWS management and representatives of Wells Fargo Securities a wide range of considerations regarding the potential risks and benefits associated with the proposal, including the value to CTWS shareholders of the proposed exchange ratio (including the implied premium and pro forma ownership for CTWS shareholders in the combined company), strategic considerations, cultural fit, governance matters and credit rating impact. Following these discussions, the CTWS board of directors authorized members of CTWS management to engage in preliminary discussions with SJW, provide CTWS’s five-year financial projections to SJW, and to report any updates regarding the discussions with SJW to the corporate finance and investments committee of the CTWS board of directors (the “CTWS CF&I committee”). The CTWS CF&I committee is authorized pursuant to its committee charter to assist the CTWS board of directors in the evaluation of proposed merger and acquisition transactions and other significant activities of CTWS.

Following the December 15, 2017 meeting and over the course of December 2017 and early January 2018, SJW and CTWS exchanged five-year financial projections, held calls to review each other’s financial forecasts and assumptions, and maintained communication to facilitate due diligence and otherwise explore the potential transaction. Representatives of J.P. Morgan and Wells Fargo Securities also participated in the due diligence review of SJW and CTWS.

On January 10, 2018, Mr. Thornburg sent Mr. Benoit a letter reiterating SJW’s interest in a transaction with CTWS on the terms outlined in the proposal and detailing SJW’s perspective of the significant benefits that would result from the potential transaction, including: the creation of a leading, national water utility; greater geographic diversity and new growth regions for both organizations; increased scale enabling the combined company to take advantage of more and larger growth opportunities; a combined leadership team closely aligned in their commitment to a culture of serving customers, communities, employees, shareholders and the environment; greater earnings growth potential than either SJW or CTWS could attain individually, with significant and immediate earnings accretion for the two companies’ combined shareholders; a stronger balance sheet with a lower cost of capital over the long term; and customer benefits through the reduction of public company costs, enhancing information technology services systems and procurement benefits. Mr. Thornburg’s letter also specified that Mr. Benoit would be named president of the New England Region and The Connecticut Water Company, and that certain other CTWS officers may be named as officers of the combined company or its subsidiaries. Mr. Thornburg’s letter to Mr. Benoit was accompanied by discussion materials prepared by J.P. Morgan at the direction of SJW management regarding the strategic and financial benefits of the potential transaction. The discussion materials included a proposal from SJW to conduct share repurchases in conjunction with the closing of the potential transaction in order to optimize the pro forma balance sheet of the combined company and increase earnings accretion.

On January 12, 2018, the CTWS CF&I committee held a special meeting with members of CTWS management and representatives of Wells Fargo Securities in attendance. During the meeting, representatives of Wells Fargo Securities provided an update on developments since the December 15, 2017 meeting of the CTWS board of directors, reviewed the strategic considerations and potential risks associated with the potential transaction and provided preliminary financial analyses to assist the CTWS CF&I committee in its evaluation of the potential transaction. After discussion, the CTWS CF&I committee unanimously determined to recommend that the CTWS board of directors authorize the members of CTWS management and CTWS’s advisors to

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conduct additional due diligence on the potential transaction with SJW and to develop information for the CTWS board of directors and the CTWS CF&I committee to consider in structuring a counterproposal, if appropriate. On the same day, Mr. Benoit updated Mr. Thornburg on the recommendation of the CTWS CF&I committee and outlined next steps.

On January 18, 2018, the CTWS board of directors held a regular meeting with members of CTWS management and representatives of Wells Fargo Securities in attendance. During the meeting, the CTWS board of directors discussed with the members of CTWS management and representatives of Wells Fargo Securities the strategic considerations and potential risks associated with the potential transaction. Following this discussion, the CTWS board of directors agreed with the CTWS CF&I committee’s recommendation authorizing the members of CTWS management and CTWS’s advisors to conduct additional due diligence on the potential transaction with SJW and to develop information for the CTWS board of directors and the CTWS CF&I committee to consider in structuring a counterproposal, if appropriate. Following the meeting, Mr. Benoit contacted Mr. Thornburg to communicate the CTWS board of directors’ authorization to proceed with management meetings and due diligence.

On January 19, 2018, Mr. Benoit and Mr. Thornburg discussed next steps regarding the potential transaction, including a meeting between certain members of management of CTWS and SJW.

On January 25 and 26, 2018, members of SJW management and CTWS management and representatives of J.P. Morgan and Wells Fargo Securities met at the offices of Wells Fargo Securities in Houston, Texas. Over the course of these two days, the companies reviewed and discussed their businesses and operations, shared commitments to customer service, approach to regulatory affairs, required approvals for the potential transaction, the potential benefits of the potential transaction on various stakeholders, SJW’s proposal to conduct share repurchases in conjunction with the closing of the potential transaction, and the potential organizational structure and operations of the combined company, as well as outstanding diligence items, transaction timing and next steps in their evaluation of the potential transaction. During the meetings, the companies also discussed SJW’s and CTWS’s plan to share updated five-year financial projections that reflected the expected financial impact on SJW and CTWS of the 2017 Tax Cuts and Jobs Act.

On January 30, 2018, the SJW finance committee held a meeting with members of SJW management and representatives of J.P. Morgan and Skadden in attendance. During the meeting, members of SJW management reviewed recent communications with CTWS, including the management meetings that took place in Houston, Texas on January 25 and 26, 2018, and developments regarding the potential transaction, including a summary of key resolved and outstanding items. The SJW finance committee discussed market, process and timing considerations, and regulatory and shareholder approval matters with members of SJW management and representatives of J.P. Morgan and Skadden. Following discussion, the SJW finance committee came to a consensus to continue to review the financial, regulatory and other aspects of the potential transaction with CTWS.

On January 31, 2018, the SJW board of directors held a meeting with members of SJW management in attendance. The SJW finance committee reviewed and discussed with the SJW board of directors a report regarding the matters discussed at the January 30 meeting of the SJW finance committee, including the status of discussions with CTWS regarding the potential transaction.

On February 7, 2018, CTWS issued a press release and filed a Current Report on Form 8-K disclosing that The Connecticut Water Company, a wholly-owned subsidiary of CTWS, had entered into a rate settlement agreement with the Connecticut Office of Consumer Counsel on February 6, 2018. The rate settlement agreement contemplates a change in The Connecticut Water Company’s customer rates effective for bills rendered on and after April 1, 2018 made up of the following components: (i) the revenue requirements associated with a $36.3 million addition to rate base to reflect necessary upgrades to The Connecticut Water Company’s Rockville Water Treatment Facility; and (ii) folding the amount of the Water Infrastructure Conservation Adjustment

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charge on customers’ bills into base rates. If approved by the Connecticut Public Utilities Regulatory Authority (“PURA”), the settlement will permit The Connecticut Water Company to recover additional investments through its rates, which is expected to have a positive impact on CTWS’s earnings per share.

Also on February 7, 2018, the CTWS CF&I committee held a special telephonic meeting with members of CTWS management and representatives of Wells Fargo Securities in attendance. During the meeting, representatives of Wells Fargo Securities reviewed with the CTWS board of directors a preliminary analysis of the strategic alternatives available to CTWS, including continuing to operate on a standalone basis, the merger of equals transaction with SJW and a comparison of a merger of equals transaction with a hypothetical transaction involving the acquisition of CTWS for cash. The CTWS CF&I committee engaged in further discussion regarding the strategic alternatives available to CTWS and concluded that a merger of equals transaction would best position CTWS to continue delivering value to its shareholders and fulfilling its commitment to its customers, employees and communities, provided acceptable terms could be negotiated. Representatives of Wells Fargo Securities then reviewed with the CTWS CF&I committee its updated preliminary financial analyses in connection with the potential transaction, including the implied premium to CTWS shareholders of approximately 10.6% based on the 1.0 exchange ratio in the proposal and current market prices and pro forma ownership for SJW stockholders and CTWS shareholders of approximately 62.5% and 37.5%, respectively, of the outstanding shares of the combined company. Representatives of Wells Fargo Securities also discussed the proposal from SJW to conduct share repurchases in conjunction with the closing of the potential transaction in order to optimize the pro forma balance sheet of the combined company and increase earnings accretion. The members of CTWS management also briefed the CTWS CF&I committee on the key areas of discussion during the management meetings that took place in Houston, Texas on January 25 and 26, 2018. The CTWS CF&I committee engaged in discussion with the members of CTWS management and representatives of Wells Fargo Securities regarding whether or not to recommend that the CTWS board of directors proceed with making a counterproposal to SJW and the appropriate terms of any such counterproposal, including the exchange ratio, governance rights and the board composition of the combined company. With respect to the exchange ratio, the CTWS CF&I committee discussed the recent volatility in the equity markets and the impact of the CPUC’s proposed decision (as defined below) and The Connecticut Water Company’s rate settlement agreement on SJW’s and CTWS’s respective stock prices. Following such discussion, the CTWS CF&I committee authorized members of CTWS management and CTWS’s advisors to continue to evaluate the potential transaction and develop a counterproposal to share with the CTWS CF&I committee at a meeting to be scheduled in the near future.

On February 9, 2018, SJW filed a Current Report on Form 8-K disclosing that the California Public Utilities Commission (the “CPUC”) had issued a proposed decision (the “CPUC’s proposed decision”) on February 6, 2018 in connection with SJW’s April 3, 2017 application requesting authority to increase its authorized cost of capital for the period from January 1, 2018 to December 31, 2020. The CPUC’s proposed decision provided for a reduction to SJW’s authorized return on equity from 9.43% to 8.30% and its overall return on rate base from 8.09% to 7.19%. While the CPUC’s proposed decision was subject to change, SJW’s authorized revenue was expected to reduce by approximately $10 million for 2018 if the proposal remained unchanged (on March 22, 2018, the CPUC issued a final decision providing a reduction to SJW’s authorized return on equity from 9.43% to 8.90% and its overall return on rate base from 8.09% to 7.64%, with an anticipated reduction in SJW’s authorized revenue for 2018 of approximately $6 million). Following the issuance of the CPUC’s proposed decision, members of SJW management discussed with members of CTWS management the impact of the CPUC’s proposed decision on SJW’s business and SJW’s plan to address the proposed decision.

On February 9, 2018, Mr. Thornburg called Mr. Benoit to provide an update on SJW’s plan of action in response to the CPUC’s proposed decision. Mr. Thornburg reaffirmed SJW’s interest in the potential transaction and expressed SJW’s intention to revise its proposed exchange ratio in light of the relative movement in the companies’ stock prices and the potential impact of the CPUC’s proposed decision. Mr. Thornburg and Mr. Benoit agreed that SJW and CTWS would share updated five-year financial projections that reflected the

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expected financial impact on SJW and CTWS of the 2017 Tax Cuts and Jobs Act, the CPUC’s proposed decision on SJW and The Connecticut Water Company’s rate settlement agreement on CTWS.

Later that day, Mr. Benoit sent a letter to the CTWS board of directors informing them of his conversation with Mr. Thornburg. The CTWS CF&I committee, members of CTWS management and representatives of Wells Fargo Securities discussed that it was preferable not to make a counterproposal at this time, but that SJW and CTWS should continue sharing information.

Also on February 9, 2018, representatives of SJW sent to CTWS and Wells Fargo Securities an initial draft of the merger agreement. SJW also sent to CTWS and Wells Fargo Securities its updated five-year financial projections.

On February 12, 2018, the SJW finance committee held a meeting with members of SJW management and representatives of J.P. Morgan and Skadden in attendance. During the meeting, members of SJW management reviewed recent developments regarding the potential transaction, including SJW’s delivery of an initial draft of the merger agreement to CTWS, as well as the CPUC’s proposed decision and its potential detrimental impact on SJW’s cost of capital. Representatives of J.P. Morgan presented to the SJW finance committee a revised financial presentation based on revised projections provided by SJW. Members of the SJW finance committee then engaged in a discussion regarding the potential impact of the CPUC’s proposed decision and recent improved market performance of CTWS on SJW’s value and the potential financial terms of the potential transaction. Thereafter, the SJW finance committee instructed Mr. Thornburg to reiterate to CTWS management SJW’s continued interest in the potential transaction and to deliver, subject to the approval of the SJW board of directors, a revised exchange ratio proposal of 1.125 shares of SJW common stock per outstanding share of CTWS common stock (the “1.125 exchange ratio”) (which, at market close on February 12, 2018, represented a premium of approximately 8.3% based on the closing share prices of SJW and CTWS and would result in SJW stockholders and CTWS shareholders owning approximately 60.3% and 39.7%, respectively, of the outstanding shares of the combined company).

On February 13, 2018, Messrs. Thornburg and Benoit had a phone discussion during which Mr. Thornburg proposed the 1.125 exchange ratio, subject to approval of the SJW board of directors. Following the phone discussion, Mr. Thornburg sent Mr. Benoit discussion materials prepared by J.P. Morgan at the direction of SJW management containing a contribution analysis and an accretion analysis based on SJW’s proposed revised exchange ratio. Mr. Benoit informed the CTWS board of directors and members of CTWS management of his discussion with Mr. Thornburg regarding the 1.125 exchange ratio.

On February 14, 2018, representatives of Wells Fargo Securities sent to SJW and J.P. Morgan the updated CTWS five-year financial projections on behalf of CTWS.

Also on February 14, 2018, the executive vice president and general counsel of Eversource contacted Ms. Wallace to set up a meeting between Ms. Wallace, Mr. Benoit and the chief executive officer and executive vice president and general counsel of Eversource.

On February 16, 2018, the CTWS CF&I committee held a special telephonic meeting with members of CTWS management and representatives of Wells Fargo Securities in attendance. During the meeting, the CTWS CF&I committee discussed with the members of CTWS management and representatives of Wells Fargo Securities the latest developments with respect to the potential transaction with SJW, including Wells Fargo Securities’ preliminary analysis of the 1.125 exchange ratio. At market close on February 15, 2018, the 1.125 exchange ratio represented a premium of approximately 13% based on the closing share prices of SJW and CTWS and would result in SJW stockholders and CTWS shareholders owning approximately 59.7% and 40.3%, respectively, of the outstanding shares of the combined company. Following additional discussion, the CTWS CF&I committee unanimously proposed to recommend that the CTWS board of directors make a counterproposal to SJW that provided for, among other matters, equal board representation for directors

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designated by each of SJW and CTWS on the combined company’s board of directors (with CTWS designating the lead independent director, consistent with SJW’s initial proposal) and an exchange ratio of 1.150 shares of SJW common stock per outstanding share of CTWS common stock (which, at market close on February 15, 2018, represented a premium of approximately 15.5% based on the closing share prices of SJW and CTWS and would result in SJW stockholders and CTWS shareholders owning approximately 59.3% and 40.7%, respectively, of the outstanding shares of the combined company). The CTWS CF&I committee authorized members of CTWS management and CTWS’s advisors to draft a response to SJW’s proposal to be shared with the CTWS board of directors at a meeting to be held in the near future.

Later on February 16, 2018, Mr. Benoit informed Mr. Thornburg that, at a meeting earlier that day, the CTWS CF&I committee determined to recommend to the full CTWS board of directors that CTWS submit a counterproposal to SJW.

On February 19, 2018, the CTWS board of directors held a special telephonic meeting with members of CTWS management and representatives of Wells Fargo Securities and Sullivan & Cromwell in attendance. During the meeting, the members of CTWS management and representatives of Wells Fargo Securities provided an update on the recent developments in the potential transaction with SJW and the matters discussed by the CTWS CF&I committee during its February 16 meeting. Representatives of Sullivan & Cromwell then reviewed and discussed with the members of the CTWS board of directors their fiduciary duties in connection with considering strategic alternatives, including the potential transaction with SJW. The CTWS board of directors then engaged in further discussion regarding the strategic alternatives available to CTWS and determined that a merger of equals transaction on appropriate terms would best position CTWS to continue delivering value to its shareholders and fulfilling its commitment to its customers, employees and communities. After additional discussions, the CTWS board of directors agreed with the recommendations of the CTWS CF&I committee and authorized members of CTWS management to respond to SJW’s current proposal with a counterproposal that provided for, among other matters, equal board representation for directors designated by each of SJW and CTWS on the combined company’s board of directors and an exchange ratio of 1.150 shares of SJW common stock per outstanding share of CTWS common stock (which, at market close on February 16, 2018, represented a premium of approximately 18.9% based on the closing share prices of SJW and CTWS and would result in SJW stockholders and CTWS shareholders owning approximately 59.3% and 40.7%, respectively, of the outstanding shares of the combined company).

The CTWS board of directors also discussed the meeting invitation that Ms. Wallace received from Eversource and concluded that Ms. Wallace should respond to the executive vice president and general counsel of Eversource to accept the meeting request. Following the board meeting, Ms. Wallace contacted the executive vice president and general counsel of Eversource. During the course of their phone conversation, Ms. Wallace indicated that while she was willing to meet, it was unlikely that the CTWS board would be receptive to pursuing a sale of CTWS, and Ms. Wallace and the executive vice president and general counsel of Eversource determined not to move forward with scheduling a meeting.

On February 20, 2018, Mr. Benoit sent a letter to Mr. Thornburg that reflected the CTWS counterproposal approved by the CTWS board of directors. On the same day, Mr. Benoit and Mr. Thornburg also had a brief phone discussion about CTWS’s counterproposal.

On February 21, 2018, the SJW finance committee held a meeting with members of SJW management and representatives of J.P. Morgan and Skadden in attendance. During the meeting, the members of SJW management provided an update on recent developments in the potential transaction with CTWS and the CTWS counterproposal included in Mr. Benoit’s February 20 letter, which contemplated an exchange ratio of 1.150 shares of SJW common stock per outstanding share of CTWS common stock and equal representation on the combined company’s board of directors. Representatives of J.P. Morgan then reviewed and discussed with the SJW finance committee the terms of the CTWS counterproposal. The SJW finance committee then engaged in further discussion regarding financial, governance, dividend, regulatory and shareholder support matters, as well

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as potential counterproposals to CTWS. Following additional discussion, the SJW finance committee recommended that SJW management review with the full SJW board of directors potential alternative exchange ratios that may be appropriate for the potential transaction.

On February 22, 2018, the SJW board of directors held a meeting with members of SJW management and representatives of J.P. Morgan and Skadden in attendance. During the meeting, the members of SJW management provided an update on the recent developments in the potential transaction with CTWS. Mr. More provided the SJW board of directors with an update of matters discussed by the SJW finance committee during its February 21 meeting. The SJW board of directors engaged in a discussion regarding the February 20 letter received from CTWS. Representatives of J.P. Morgan then reviewed and discussed with the SJW board of directors the financial terms of the CTWS counterproposal and the financial terms of potential counterproposals to CTWS. After additional discussions with representatives of Skadden and J.P. Morgan, the members of the SJW board of directors present at the meeting unanimously determined to authorize Mr. Thornburg to respond to CTWS’s current proposal with a counterproposal that, among other matters, provided that the combined company’s board of directors be composed of a number of representatives from each of the SJW and CTWS board of directors proportionate to SJW’s and CTWS’s relative post-merger ownership of the combined company and provided for a revised exchange ratio of 1.1375 shares of SJW common stock per outstanding share of CTWS common stock (which, at market close on February 22, 2018, represented a premium of approximately 22.5% based on the closing share prices of SJW and CTWS and would result in SJW stockholders and CTWS shareholders owning approximately 59.5% and 40.5%, respectively, of the outstanding shares of the combined company).

Later on February 22, 2018, following the meeting of the SJW board of directors, Mr. Thornburg contacted Mr. Benoit and informed him that the SJW board of directors had authorized him to respond to CTWS with a counterproposal of a revised exchange ratio of 1.1375 shares of SJW common stock per outstanding share of CTWS common stock and that the combined company’s board of directors be composed of a number of representatives from each of the SJW and CTWS board of directors proportionate to SJW’s and CTWS’s relative post-merger ownership of the combined company, consistent with the initial proposal.

On February 23, 2018, Mr. Benoit updated the CTWS board of directors regarding the latest terms proposed by SJW. Following a review by the CTWS board of directors of such terms and updated preliminary financial analyses provided by representatives of Wells Fargo Securities, all members of the CTWS board of directors expressed their support and authorization for the members of CTWS management and CTWS’s advisors to conduct further due diligence and negotiate a definitive merger agreement on the basis of such terms. Later that day, Mr. Benoit communicated to Mr. Thornburg the decision of the CTWS board of directors to proceed with conducting further due diligence and negotiating a definitive merger agreement on the basis of such terms.

Also on February 23, 2018, SJW and CTWS opened virtual data rooms. Reciprocal due diligence commenced and continued through March 14, 2018 and included review of financial and legal information and due diligence calls with representatives of SJW and CTWS and their respective advisors.

On February 26, 2018, the SJW board of directors held a meeting with members of SJW management in attendance. Messrs. Thornburg and More provided to the SJW board of directors a report regarding the status of communications with CTWS respecting the potential transaction. The SJW board of directors reviewed and discussed such report.

On March 2, 2018, with authorization from members of SJW management, representatives of Skadden sent to representatives of Sullivan & Cromwell a draft SJW voting and support agreement proposed to be entered into by certain stockholders of SJW beneficially owning, in the aggregate, approximately 16% of the outstanding shares of SJW common stock.

On March 5, 2018, the CTWS CF&I committee held a special telephonic meeting with members of CTWS management and representatives of Wells Fargo Securities and Sullivan & Cromwell in attendance. During the

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meeting, representatives of Wells Fargo Securities provided the CTWS CF&I committee with an overview of the latest developments in the various due diligence work streams. Representatives of Sullivan & Cromwell then summarized the key terms of, and the issues raised by, the draft merger agreement proposed by SJW. The CTWS CF&I committee discussed with the members of CTWS management and representatives of Sullivan & Cromwell their proposed responses to the draft merger agreement, including, among other matters, (i) reducing the proposed termination fee to be paid by CTWS in certain circumstances from approximately 3.9% of CTWS equity value to approximately 3.0% of CTWS equity value, (ii) revising the proposed termination fee to be paid by SJW in certain circumstances from approximately 3.9% of CTWS equity value to approximately 3.0% of SJW equity value and (iii) rejecting the reciprocal “force the vote” provision proposed by SJW that would prohibit CTWS or SJW from terminating the merger agreement in order to enter into an agreement with respect to a superior proposal and would instead require SJW and CTWS to hold their respective shareholder meetings even if the relevant party has changed its recommendation that its shareholders vote in favor of the merger. Following discussion, the CTWS CF&I committee authorized members of CTWS management and Sullivan & Cromwell to send a revised draft of the merger agreement to SJW and Skadden.

Later on March 5, 2018, representatives of Sullivan & Cromwell sent a revised draft of the merger agreement to representatives of Skadden.

On March 6, 2018, members of SJW management reviewed the draft merger agreement with representatives of Skadden and J.P. Morgan, following which representatives of Skadden discussed certain issues with representatives of Sullivan & Cromwell.

On March 6, 2018, the CTWS board of directors held a special telephonic meeting with members of CTWS management in attendance. During the meeting, Mr. Richard Forde, chairman of the CTWS CF&I committee, and the members of CTWS management updated the CTWS board of directors on the key terms of, issues raised by and CTWS’s response to the draft merger agreement proposed by SJW.

Between March 6, 2018 and March 14, 2018, SJW and CTWS, with assistance from their respective financial advisors and legal counsel, continued to negotiate the commercial and legal terms of the potential transaction and related documentation, including the merger agreement, the confidential disclosure letters to the merger agreement and the SJW voting and support agreements (with the assistance of the stockholders’ legal counsel). Among other terms, over the course of the negotiations SJW and CTWS agreed that (i) the termination fee to be paid by CTWS in certain circumstances would be equal to approximately 3.75% of CTWS’s equity value, (ii) the termination fee to be paid by SJW in certain circumstances would be equal to approximately 3.75% of SJW’s equity value, (iii) each of SJW and CTWS would be required to reimburse the expenses of the other party up to $5 million (a reduction of $2 million from the $7 million proposed by SJW) in the event that such party did not obtain the approvals of its shareholders required in connection with the merger, and (iv) the merger agreement would not include a “force the vote” provision.

On March 8, 2018, representatives of SJW met with representatives of Standard & Poor’s Financial Services LLC (“S&P”) in New York, New York to discuss the potential transaction, a potential share repurchase to be effective following consummation of the potential transaction and the impact of such transaction and share repurchase on SJW’s credit rating. Mr. Benoit also participated in the meeting by telephone.

On March 9, 2018, the SJW finance committee held a meeting with members of SJW management and representatives of J.P. Morgan and Skadden in attendance. During the meeting, representatives of Skadden reviewed and discussed with the SJW finance committee a summary of negotiations with CTWS regarding the merger agreement, and the members of SJW management provided an update of recent developments in the potential transaction with CTWS and reported to the SJW finance committee on the status of ongoing mutual due diligence with CTWS and meetings with credit ratings agencies in connection with the potential transaction. The SJW finance committee also engaged in discussion regarding a potential share repurchase to be effective following consummation of the potential transaction, ongoing negotiations with certain SJW stockholders to

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enter into the SJW voting and support agreements in support of the potential transaction, tentative communications rollout plans and change-in-control provisions relating to employment agreements with certain members of CTWS management.

On March 13, 2018, the SJW board of directors held a meeting with members of SJW management and representatives of J.P. Morgan and Skadden in attendance. During the meeting, Mr. More provided the SJW board of directors with an update of the SJW finance committee’s meetings and activities in connection with the potential transaction. Representatives of Skadden reviewed with the SJW board of directors its fiduciary duties in connection with considering the potential transaction with CTWS, the key terms of the merger agreement, including the remaining open points, and the SJW voting and support agreements. Representatives of J.P. Morgan then reviewed with the SJW board of directors J.P. Morgan’s financial analysis of the financial terms of the potential transaction. Following discussion with members of SJW management and representatives of J.P. Morgan and Skadden, the SJW board of directors provided guidance to management regarding the remaining open points with respect to the potential transaction.

On the morning of March 14, 2018, the CTWS board of directors held a regular meeting with members of CTWS management and representatives of Wells Fargo Securities, Sullivan & Cromwell and Murtha Cullina LLP (“Murtha Cullina”), outside Connecticut legal counsel to CTWS, in attendance. Representatives of Sullivan & Cromwell reviewed with the CTWS board of directors its fiduciary duties in connection with considering whether to approve the potential transaction with SJW as well as the key terms of the merger agreement, including the remaining open points. Representatives of Wells Fargo Securities then reviewed with the CTWS board of directors the financial analyses performed by Wells Fargo Securities in connection with its evaluation of the potential transaction, highlighting key valuation methods and financial metrics, as described further in the section entitled “The Merger — Opinion of CTWS’s Financial Advisor — Opinion of Wells Fargo Securities, LLC” beginning on page 88 of this joint proxy statement/prospectus. The CTWS board of directors engaged in discussions with and asked questions of the members of CTWS management and representatives of Wells Fargo Securities and Sullivan & Cromwell. A representative of Murtha Cullina then reviewed with the CTWS board of directors a proposed amendment to the Amended and Restated Bylaws of CTWS to adopt a forum selection clause (the “forum selection bylaw amendment”) to designate certain courts located in the State of Connecticut as the exclusive forum for certain actions brought against CTWS or any director, officer or shareholder of CTWS. The CTWS board of directors authorized members of CTWS management and representatives of Sullivan & Cromwell to resolve the open points in the transaction documents and decided to reconvene in the afternoon.

Also on the morning of March 14, 2018, the SJW board of directors held a meeting with members of SJW management and representatives of J.P. Morgan and Skadden in attendance. During the meeting, representatives of Skadden reviewed with the SJW board of directors its fiduciary duties in connection with considering the potential transaction with CTWS, the key terms of the merger agreement, including the remaining open points, and the SJW voting and support agreements. Representatives of J.P. Morgan reviewed with the SJW board of directors J.P. Morgan’s financial analysis of the financial terms of the potential transaction. Representatives of J.P. Morgan then delivered to the SJW board of directors J.P. Morgan’s oral opinion, which was subsequently confirmed by delivery of a written opinion dated March 14, 2018, to the effect that, as of such date and based upon and subject to the factors, assumptions, limitations and qualifications set forth in its opinion, the exchange ratio in the merger was fair, from a financial point of view, to SJW, as more fully described below in the section entitled “The Merger — Opinion of SJW’s Financial Advisor — Opinion of J.P. Morgan Securities LLC” beginning on page 73 of this joint proxy statement/prospectus. Following further discussion, the SJW board of directors thereafter unanimously declared advisable and in the best interests of SJW and its stockholders and determined to approve each of (i) the merger agreement, (ii) the issuance of shares of SJW common stock to holders of CTWS common stock pursuant to the merger, (iii) the SJW certificate of incorporation amendment, (iv) the SJW voting and support agreements and (v) the consummation of the transactions contemplated by the merger agreement, including the merger. The SJW board of directors also unanimously resolved to submit for consideration and approval by the SJW stockholders entitled to vote at a special meeting of the SJW

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stockholders, and to recommend that the SJW stockholders approve, the issuance of shares of SJW common stock to holders of CTWS common stock pursuant to the merger and the SJW certificate of incorporation amendment.

Later in the day on March 14, 2018, the CTWS board of directors held a special telephonic meeting with members of CTWS management and representatives of Wells Fargo Securities and Sullivan & Cromwell in attendance. During the meeting, representatives of Sullivan & Cromwell updated the CTWS board of directors regarding the outcome of the points in the transaction documents that had remained open earlier in the day, and reviewed with the CTWS board of directors the resolutions that it would be adopting if it determined to enter into the potential transaction with SJW. Representatives of Wells Fargo Securities then reviewed with the CTWS board of directors its final financial analysis of the exchange ratio provided for in the merger agreement based on the stock prices of SJW and CTWS. At market close on March 14, 2018, the exchange ratio of 1.1375 shares of SJW common stock per outstanding share of CTWS common stock represented a premium of approximately 18% based on the closing share prices of SJW and CTWS and would result in SJW stockholders and CTWS shareholders owning approximately 60% and 40%, respectively, of the outstanding shares of the combined company. Representatives of Wells Fargo Securities then delivered to the CTWS board of directors its oral opinion, which was confirmed by delivery of a written opinion dated March 14, 2018, to the effect that, as of such date and based upon and subject to the assumptions made, procedures followed, matters considered and limitations and qualifications on the review undertaken by Wells Fargo Securities in preparing the opinion, the exchange ratio in the proposed merger was fair, from a financial point of view, to the holders of CTWS common stock, other than the excluded shares, as more fully described below in the section entitled “The Merger — Opinion of CTWS’s Financial Advisor — Opinion of Wells Fargo Securities, LLC” beginning on page 88 of this joint proxy statement/prospectus. Following further discussion, the CTWS board of directors thereafter unanimously determined that (i) the merger agreement and the consummation of the transactions contemplated thereby, including the merger, are in the best interests of CTWS and its shareholders, (ii) declared advisable the merger agreement and the transactions contemplated thereby, including the merger, and (iii) approved and adopted the merger agreement and the transactions contemplated thereby, including the merger. The CTWS board of directors also unanimously resolved that the merger agreement be submitted for consideration and approval by the CTWS shareholders entitled to vote at a special meeting of the CTWS shareholders and recommended that the CTWS shareholders approve the merger agreement at the CTWS special meeting. The CTWS board of directors also authorized, approved and adopted the forum selection bylaw amendment.

On the evening of March 14, 2018, SJW, CTWS and Merger Sub executed the merger agreement, and certain stockholders of SJW beneficially owning, in the aggregate, approximately 16% of the outstanding shares of SJW common stock executed the SJW voting and support agreements.

On the morning of March 15, 2018, SJW and CTWS issued a joint press release announcing the potential transaction and the execution of the merger agreement. In the joint press release, SJW also announced that, upon closing of the potential transaction and subject to market conditions and approval of the combined company’s board of directors at the time, the combined company is expected to establish a dividend at least equivalent to SJW’s announced 2018 annual dividend of $1.12 per share, which represents an immediate dividend increase of approximately 7% for the CTWS shareholders, when adjusted for the agreed exchange ratio, based on the annualized quarterly cash dividend of $0.2975 per share. SJW also announced that, given the incremental debt capacity resulting from the potential transaction, the combined company expects to pursue a share repurchase program of up to $100 million, subject to the closing of the potential transaction, market conditions and approval of the combined company’s board of directors at the time.

On April 5, 2018, Mr. Benoit received an unsolicited written proposal from Eversource regarding the acquisition by Eversource of all of the outstanding shares of CTWS common stock for $63.50 per share in cash and/or Eversource common stock at the election of CTWS shareholders (the “Eversource proposal”). Mr. Benoit promptly informed the CTWS board of directors, members of CTWS management, Sullivan & Cromwell and Wells Fargo Securities of the receipt of the Eversource proposal. CTWS also promptly notified SJW of the

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receipt of the Eversource proposal and that the CTWS board of directors planned to review and consider the Eversource proposal in consultation with its legal counsel and financial advisor, all in accordance with the terms of the merger agreement.

On April 8, 2018, the CTWS board of directors held a special telephonic meeting with members of CTWS management and representatives of Wells Fargo Securities, Sullivan & Cromwell and Murtha Cullina in attendance. During the meeting, the members of CTWS management and representatives of Wells Fargo Securities provided the CTWS board of directors with an update on recent developments surrounding the receipt by CTWS of the Eversource proposal and the receipt by SJW of the unsolicited proposal from Company X. See “Recent Developments” on page 23 of this joint proxy statement/prospectus. Representatives of Sullivan & Cromwell then reviewed and discussed with the members of the CTWS board of directors their fiduciary duties in connection with considering the Eversource proposal, the provisions of the merger agreement setting forth CTWS’s obligations with respect to the receipt of an unsolicited written takeover proposal and the process and considerations for the CTWS board of directors to assess whether or not the Eversource proposal constitutes or is reasonably likely to lead to a superior proposal as defined in the merger agreement. Representatives of Wells Fargo Securities then reviewed with the CTWS board of directors its preliminary financial analyses regarding the Eversource proposal as compared to the proposed merger with SJW. The representatives of Wells Fargo Securities informed the CTWS board of directors that Wells Fargo Securities had requested and expected to receive updated five-year projected financial plans for SJW reflecting the CPUC’s March 22, 2018 decision regarding SJW’s authorized cost of capital, and that Wells Fargo Securities planned to update its preliminary financial analyses following receipt of the updated SJW financial plans. The CTWS board of directors then engaged in further discussion regarding the Eversource proposal and the timeline and next steps for evaluating the Eversource proposal. The CTWS board of directors determined that the CF&I committee should meet in the near future to further consider the Eversource proposal once Wells Fargo Securities had updated its financial analyses.

On April 11, 2018, SJW shared its updated five-year projected financial plans with CTWS and Wells Fargo Securities through SJW’s virtual data room.

On April 16, 2018, the CF&I committee held a special telephonic meeting with members of CTWS management and representatives of Wells Fargo Securities and Sullivan & Cromwell in attendance. During the meeting, the members of CTWS management and representatives of Wells Fargo Securities provided the CF&I committee with an update on the most recent developments, including the outcome of the SJW board of directors meeting held on April 13, 2018 with respect to the unsolicited proposal from Company X. Representatives of Wells Fargo Securities then reviewed with the CF&I committee its preliminary financial analyses regarding the Eversource proposal as compared to the proposed merger with SJW, which analyses had been updated to reflect the latest SJW five-year projected financial plans. The CF&I committee asked questions throughout Wells Fargo Securities’ presentation and requested additional financial analyses of the stock consideration component included in the Eversource proposal. The CF&I committee then engaged in further discussion regarding the Eversource proposal with Wells Fargo Securities and Sullivan & Cromwell. The CF&I committee determined to meet again in the near future to further discuss the Eversource proposal after receiving the additional financial analysis that the CF&I committee requested from Wells Fargo Securities.

On April 17, 2018, the chairman, chief executive officer and president of Eversource sent a follow up email to Mr. Benoit regarding the Eversource proposal, in which Eversource requested a substantive response to the Eversource proposal by the close of business on Thursday, April 19, 2018. Mr. Benoit responded that CTWS expects to be in a position to respond to the Eversource proposal by the end of the week or early the following week, but emphasized that the timing of a decision remains with the CTWS board of directors, which is carefully considering the Eversource proposal with CTWS management and its advisors.

On April 19, 2018 at 12:30 p.m., Eastern time, the CF&I committee held a special telephonic meeting with members of CTWS management and representatives of Wells Fargo Securities and Sullivan & Cromwell in

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attendance. During the meeting, the representatives of Wells Fargo Securities reviewed with the CF&I committee its financial analyses regarding the Eversource proposal as compared to the proposed merger with SJW, which analyses had been updated to include the stock consideration component included in the Eversource proposal that was requested by the CF&I committee during the April 16 committee meeting. The CF&I committee asked questions throughout Wells Fargo Securities’ presentation and engaged in further discussion regarding the Eversource proposal with representatives of Wells Fargo Securities and Sullivan & Cromwell. The CF&I committee discussed the reasons that it continues to believe that the proposed merger with SJW, as compared to the transaction contemplated by the Eversource proposal, is in the best interests of CTWS shareholders and has significant long-term benefits for CTWS’s customers, employees and communities, which reasons are further described in the section entitled “— CTWS’s Reasons for the Merger; Recommendation of the CTWS Board of Directors.” After discussion, the CF&I committee unanimously recommended to the CTWS board of directors that (i) the CTWS board of directors determine that the Eversource proposal does not constitute and is not reasonably likely to lead to a superior proposal and (ii) CTWS inform Eversource that CTWS is not permitted to participate in any discussions with, or furnish any information regarding CTWS to, Eversource in connection with the Eversource proposal pursuant to the terms of the merger agreement.

On April 19, 2018 at 1:30 p.m., Eastern time, the CTWS board of directors held a special telephonic meeting with members of CTWS management and representatives of Wells Fargo Securities and Sullivan & Cromwell in attendance. During the meeting, the representatives of Wells Fargo Securities reviewed with the CTWS board of directors its financial analyses regarding the Eversource proposal as compared to the proposed merger with SJW. The CTWS board of directors asked questions throughout Wells Fargo Securities’ presentation and engaged in further discussion regarding the Eversource proposal with representatives of Wells Fargo Securities and Sullivan & Cromwell. The CTWS board of directors discussed the reasons that it continues to believe that the proposed merger with SJW, as compared to the transaction contemplated by the Eversource proposal, is in the best interests of CTWS shareholders and has significant long-term benefits for CTWS’s customers, employees and communities, which reasons are further described in the section entitled “— CTWS’s Reasons for the Merger; Recommendation of the CTWS Board of Directors.” After further discussion in executive session with the non-employee directors and Sullivan & Cromwell in attendance, the non-employee directors of the CTWS board of directors unanimously accepted the CF&I committee’s recommendation and (i) determined that the Eversource proposal does not constitute and is not reasonably likely to lead to a superior proposal, (ii) authorized Mr. Benoit and CTWS’s advisors to inform Eversource that CTWS is not permitted to participate in any discussions with, or furnish any information regarding CTWS to, Eversource in connection with the Eversource proposal pursuant to the terms of the merger agreement and (iii) reaffirmed its recommendation that the CTWS shareholders approve the merger agreement and such other matters that are submitted for their approval in connection with the merger agreement at the special meeting.

On April 19, 2018 at approximately 5:00 p.m., Eastern time, Eversource issued a press release to disclose the Eversource proposal.

On April 19, 2018 at approximately 6:00 p.m., Eastern time, Mr. Benoit telephoned the chairman, chief executive officer and president of Eversource to inform him that the CTWS board of directors had unanimously determined that the Eversource proposal does not constitute and is not reasonably likely to lead to a superior proposal. Mr. Benoit noted that, pursuant to the terms of the merger agreement, CTWS is not permitted to participate in any discussions with, or furnish any information regarding CTWS to, Eversource in connection with the Eversource proposal.

On April 19, 2018 at approximately 6:15 p.m., Eastern time, CTWS issued a press release reaffirming the CTWS board of directors’ intention to recommend that all CTWS shareholders approve the merger agreement. The press release also confirmed receipt of the Eversource proposal and disclosed that the CTWS board of directors had unanimously determined that the Eversource proposal is not a superior proposal and is not reasonably likely to lead to a superior proposal.

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On April 19, 2018 at approximately 10:30 p.m., Eastern time, SJW issued a press release reaffirming its commitment to the existing merger agreement with CTWS and reiterating that the SJW board of directors continues to believe that the proposed merger of equals provides the shareholders of both CTWS and SJW with the best opportunity for value creation over the long term.

SJW’s Reasons for the Merger; Recommendation of the SJW Board of Directors

In reaching its decision to approve the merger agreement and recommend approval of the issuance of shares of SJW common stock to CTWS shareholders pursuant to the merger and the adoption of the SJW certificate of incorporation amendment, the SJW board of directors consulted with SJW’s management, as well as with SJW’s legal and financial advisors, and also considered a number of factors that the SJW board of directors viewed as supporting its decisions, including, but not limited to, the following:

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The SJW board of directors weighed the foregoing against a number of risks and potentially negative factors, including:

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In view of the wide variety of factors considered in connection with its evaluation of the merger and the complexity of these matters, the SJW board of directors did not find it useful and did not attempt to assign any relative or specific weights to the various factors that it considered in reaching its determination to approve the merger and the merger agreement and to recommend that SJW stockholders vote “FOR” the proposal to approve the issuance of shares of SJW common stock to CTWS shareholders pursuant to the merger, “FOR” the proposal to adopt the SJW certificate of incorporation amendment and “FOR” the proposal to approve any motion to adjourn the SJW special meeting, if necessary or appropriate, to solicit additional proxies if there are not sufficient votes to approve the issuance of shares of SJW common stock to CTWS shareholders pursuant to the merger or the adoption of the SJW certificate of incorporation amendment. In addition, although the SJW board of directors did not find it useful and did not attempt to assign any relative or specific weights to the various factors, individual members of the SJW board of directors may have assigned different weights to different factors.

The SJW board of directors unanimously approved the merger agreement and determined that the merger agreement and the transactions contemplated thereby, including the merger, are advisable and in the best interests of SJW and its stockholders. The SJW board of directors unanimously recommends that SJW stockholders vote “FOR” the proposal to approve the issuance of shares of SJW common stock to CTWS shareholders pursuant to the merger, “FOR” the proposal to adopt the SJW certificate of incorporation amendment and “FOR” the proposal to approve any motion to adjourn the SJW special meeting, if necessary or appropriate, to solicit additional proxies if there are not sufficient votes to approve the issuance of shares of SJW common stock to CTWS shareholders pursuant to the merger or the adoption of the SJW certificate of incorporation amendment.

Opinion of SJW’s Financial Advisor — Opinion of J.P. Morgan Securities LLC

Pursuant to an engagement letter dated October 27, 2016, as amended by an extension letter dated October 20, 2017, SJW retained J.P. Morgan as its financial advisor in connection with a review of potential strategic alternatives, including a potential transaction with CTWS.

At the meeting of the SJW board of directors on March 14, 2018, J.P. Morgan rendered its oral opinion to the SJW board of directors that, as of such date and based upon and subject to the factors, assumptions, limitations and qualifications set forth in its opinion, the exchange ratio in the proposed merger was fair, from a financial point of view, to SJW. J.P. Morgan has confirmed its oral opinion by delivering its written opinion to the SJW board of directors, dated March 14, 2018, that, as of such date, the exchange ratio in the proposed merger was fair, from a financial point of view, to SJW.

The full text of the written opinion of J.P. Morgan dated as of March 14, 2018, which sets forth the assumptions made, matters considered and limitations and qualifications on the review undertaken, is attached as

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Annex B to this joint proxy statement/prospectus and is incorporated herein by reference. The summary of the opinion of J.P. Morgan set forth in this proxy statement is qualified in its entirety by reference to the full text of such opinion. SJW stockholders are urged to read the opinion in its entirety. J.P. Morgan’s written opinion was addressed to the SJW board of directors (in its capacity as such) in connection with and for the purposes of its evaluation of the proposed merger, was directed only to the exchange ratio in the merger and did not address any other aspect of the merger. J.P. Morgan expressed no opinion as to the fairness of the exchange ratio to the holders of any class of securities, creditors or other constituencies of SJW or CTWS or as to SJW’s or CTWS’s underlying decision to engage in the proposed merger. The issuance of J.P. Morgan’s opinion was approved by a fairness committee of J.P. Morgan. The opinion does not constitute a recommendation to any stockholder of SJW or CTWS as to how such stockholder should vote with respect to the proposed merger or any other matter.

In arriving at its opinions, J.P. Morgan, among other things:

In addition, J.P. Morgan held discussions with certain members of the management of SJW and CTWS with respect to certain aspects of the merger, and the past and current business operations of SJW and CTWS, the financial condition and future prospects and operations of SJW and CTWS, the effects of the merger on the financial condition and future prospects of SJW and CTWS, and certain other matters J.P. Morgan believed necessary or appropriate to its inquiry.

In giving its opinion, J.P. Morgan relied upon and assumed the accuracy and completeness of all information that was publicly available or was furnished to or discussed with J.P. Morgan by SJW and CTWS or otherwise reviewed by or for J.P. Morgan, and J.P. Morgan did not independently verify (and did not assume responsibility or liability for independently verifying) any such information or its accuracy or completeness. J.P. Morgan did not conduct or was not provided with any valuation or appraisal of any assets or liabilities, nor did J.P. Morgan evaluate the solvency of SJW or CTWS under any applicable laws relating to bankruptcy, insolvency or similar matters. In relying on financial analyses and forecasts provided to J.P. Morgan or derived therefrom (including the financial benefits expected to result from the elimination of duplicative public company and other related costs expected from the transaction), J.P. Morgan assumed that they were reasonably prepared based on assumptions reflecting the best currently available estimates and judgments by management as to the expected future results of operations and financial condition of SJW and CTWS to which such analyses or forecasts relate. J.P. Morgan expressed no view as to such analyses or forecasts (including the financial benefits expected to result from the elimination of duplicative public company and other related costs expected from the transaction) or the assumptions on which they were based. J.P. Morgan also assumed that the merger will qualify as a tax-free reorganization for United States federal income tax purposes, that the other transactions contemplated by the merger agreement will be consummated as described in the merger agreement and this joint proxy statement/prospectus, and that the definitive merger agreement would not differ in any material respect

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from the draft thereof furnished to J.P. Morgan. J.P. Morgan also assumed that the representations and warranties made by SJW and CTWS in the merger agreement and the related agreements were and will be true and correct in all respects material to its analysis. J.P. Morgan is not a legal, regulatory or tax expert and relied on the assessments made by advisors to SJW with respect to such issues. J.P. Morgan further assumed that all material governmental, regulatory or other consents and approvals necessary for the consummation of the merger will be obtained without any adverse effect on SJW or CTWS or on the contemplated benefits of the merger.

J.P. Morgan’s opinion was necessarily based on economic, market and other conditions as in effect on, and the information made available to J.P. Morgan as of, the date of such opinion. J.P. Morgan’s opinion noted that subsequent developments may affect J.P. Morgan’s opinion, and that J.P. Morgan does not have any obligation to update, revise, or reaffirm such opinion. J.P. Morgan’s opinion is limited to the fairness, from a financial point of view, to SJW of the exchange ratio in the proposed merger. Furthermore, J.P. Morgan expressed no opinion with respect to the amount or nature of any compensation to any officers, directors, or employees of any party to the proposed merger, or any class of such persons relative to the exchange ratio in the proposed merger or with respect to the fairness of any such compensation. J.P. Morgan expressed no opinion as to the price at which the SJW common stock or the CTWS common stock will trade at any future time.

The terms of the merger agreement, including the exchange ratio, were determined through arm’s length negotiations between SJW and CTWS, and the decision to enter into the merger agreement was solely that of the SJW board of directors and the CTWS board of directors. J.P. Morgan’s opinion and financial analyses were only one of the many factors considered by the SJW board of directors in its evaluation of the proposed merger and should not be viewed as determinative of the views of the SJW board of directors or management with respect to the proposed merger or the exchange ratio.

In accordance with customary investment banking practice, J.P. Morgan employed generally accepted valuation methodology in rendering its opinion to the SJW board of directors on March 14, 2018 and contained in the presentation delivered to the SJW board of directors on such date in connection with the rendering of such opinion and this summary does not purport to be a complete description of the analyses or data presented by J.P. Morgan. Some of the summaries of the financial analyses include information presented in tabular format. The tables are not intended to stand alone, and in order to more fully understand the financial analyses used by J.P. Morgan, the tables must be read together with the full text of each summary. Considering the data set forth below without considering the full narrative description of the financial analyses, including the methodologies and assumptions underlying the analyses, could create a misleading or incomplete view of J.P. Morgan’s analyses.

Analysis of CTWS

Public Trading Multiples Analysis

Using publicly available information, J.P. Morgan compared selected financial data of CTWS with similar data for selected publicly traded companies engaged in businesses which J.P. Morgan judged to be sufficiently analogous to CTWS. The companies selected by J.P. Morgan were as follows:

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These companies were selected, among other reasons, because they are publicly traded companies with operations and businesses that, for purposes of J.P. Morgan’s analysis, may be considered similar in certain respects to those of CTWS based on business sector participation, financial metrics and form of operations. The analyses necessarily involve complex considerations and judgments concerning differences in financial and operational characteristics of the companies involved and other factors that could affect the companies differently than would affect CTWS.

For each company listed above, J.P. Morgan calculated and compared the multiple of market price per share of its common equity based on research analysts’ consensus estimates for earnings per share (“EPS”) for the calendar years 2018 (“2018E P/E Multiple”) and 2019 (“2019E P/E Multiple”) based on FactSet market prices, Institutional Brokers’ Estimate System consensus estimates, equity analyst research reports and other publicly available information as of March 9, 2018. In addition, with respect to CTWS, J.P. Morgan also calculated and compared the 2018E P/E Multiple and 2019E P/E Multiple based on the CTWS projections (as defined under “— Opinion of CTWS’s Financial Advisor — Opinion of Wells Fargo Securities, LLC”).

Results of the analysis were presented for the selected companies, as indicated in the following table:

Based on the results of this analysis and J.P. Morgan’s professional judgment, J.P. Morgan selected a multiple reference range of 21.5x – 31.0x for P/E for calendar year 2018 and a multiple reference range of 20.5x – 29.5x for P/E for calendar year 2019.

After applying such ranges to the respective estimated 2018 EPS and estimated 2019 EPS for CTWS based on the CTWS projections, the analysis indicated the following ranges of implied equity value per share for the CTWS common stock (rounded to the nearest $0.25):

The ranges of implied equity value per share for CTWS were compared to (1) the closing price per share of CTWS common stock of $51.18 on March 9, 2018 and (2) the implied offer price of $61.36 per share based on the exchange ratio of 1.1375 per share and the closing price per share of SJW common stock of $53.94 on March 9, 2018.

Discounted Cash Flow Analysis

J.P. Morgan conducted a discounted cash flow analysis for the purpose of determining an implied fully diluted equity value per share for the CTWS common stock. A discounted cash flow analysis is a method of evaluating an asset using estimates of the future unlevered free cash flows generated by the asset, and taking into

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consideration the time value of money with respect to those future cash flows by calculating their “present value.” The “unlevered free cash flows” refers to a calculation of the future cash flows generated by an asset without including in such calculation any debt servicing costs. “Present value” refers to the current value of the future cash flows generated by the asset, and is obtained by discounting those cash flows back to the present using a discount rate that takes into account macro-economic assumptions and estimates of risk, the cost of capital and other appropriate factors. “Terminal value” refers to the present value of all future cash flows generated by the asset for periods beyond the projections period.

J.P. Morgan calculated the present value of unlevered free cash flows for CTWS (1) for the calendar years 2018 through 2022 using unlevered free cash flows that were based upon the CTWS projections and were reviewed and approved by the management of SJW for use by J.P. Morgan in connection with its financial analyses and rendering its fairness opinion and (2) for the calendar years 2023 through 2027 using unlevered free cash flows that were derived from a rate base model and were reviewed and approved by the management of SJW for use by J.P. Morgan in connection with its financial analyses and rendering its fairness opinion. J.P. Morgan also calculated a range of terminal values for CTWS at December 31, 2027 by applying a terminal growth rate ranging from 1.25% to 1.75% to the unlevered free cash flows of CTWS for calendar year 2027, which were adjusted by the management of SJW for valuation purposes. The unlevered free cash flows and the range of terminal values were then discounted to present values using a range of discount rates from 5.25% to 5.75%. The present values were then adjusted for CTWS’s 2017 fiscal year end total debt and cash to derive implied equity values for CTWS. The discount rate range was based upon J.P. Morgan’s analysis of the weighted average cost of capital for CTWS determined by applying the Capital Asset Pricing Model and based on considerations J.P. Morgan deemed relevant in its professional judgment and experience, including target capital structures, yields for U.S. Treasury notes, levered and unlevered betas for CTWS and the selected publicly traded companies identified above, market risk premium and tax rates.

This analysis indicated the following range of implied equity value per share for the CTWS common stock, rounded to the nearest $0.25.

The range of implied equity values per share for the CTWS common stock was compared to (1) the closing price per share of CTWS common stock of $51.18 on March 9, 2018 and (2) the implied value of the merger consideration of $61.36 per share based on the exchange ratio of 1.1375 per share and the closing price per share of SJW common stock of $53.94 on March 9, 2018.

Other Information

Historical Trading Range

For reference only and not as a component of its fairness analysis, J.P. Morgan reviewed the trading range for the CTWS common stock for the 52-week period ending March 9, 2018, which was $48.86 per share to $65.04 per share, and compared that to (1) the closing price per share of CTWS common stock of $51.18 on March 9, 2018 and (2) the implied value of the merger consideration of $61.36 per share based on the exchange ratio of 1.1375 per share and the closing price per share of SJW common stock of $53.94 on March 9, 2018.

Analyst Price Targets

For reference only and not as a component of its fairness analysis, J.P. Morgan also reviewed certain publicly available equity research analyst share price targets for the CTWS common stock and noted that the range of such price targets was $53.00 per share to $64.00 per share, and compared that to (1) the closing price per share of CTWS common stock of $51.18 on March 9, 2018 and (2) the implied value of the merger consideration of $61.36 per share based on the exchange ratio of 1.1375 per share and the closing price per share of SJW common stock of $53.94 on March 9, 2018.

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Analysis of SJW

Public Trading Multiples Analysis

Using publicly available information, J.P. Morgan compared selected financial data of SJW with similar data for selected publicly traded companies engaged in businesses which J.P. Morgan judged to be sufficiently analogous to SJW. The companies selected by J.P. Morgan were as follows:

These companies were selected, among other reasons, because they are publicly traded companies with operations and businesses that, for purposes of J.P. Morgan’s analysis, may be considered similar in certain respects to those of SJW based on business sector participation, financial metrics and form of operations. The analyses necessarily involve complex considerations and judgments concerning differences in financial and operational characteristics of the companies involved and other factors that could affect the companies differently than would affect SJW.

For each company listed above, J.P. Morgan calculated and compared the 2018E P/E Multiple and 2019E P/E Multiple based on FactSet market prices, Institutional Brokers’ Estimate System consensus estimates, equity analyst research reports and other publicly available information as of March 9, 2018. In addition, with respect to SJW, J.P. Morgan also calculated and compared the 2018E P/E Multiple and 2019E P/E Multiple based on the SJW projections (as defined below under the section entitled “— Miscellaneous — Financial Forecasts Regarding SJW and CTWS”).

Results of the analysis are as follows:

Based on the results of this analysis and J.P. Morgan’s professional judgment, J.P. Morgan selected a multiple reference range of 21.5x – 31.0x for P/E for calendar year 2018 and a multiple reference range of 20.5x – 29.5x for P/E for calendar year 2019.

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After applying such ranges to the respective estimated 2018 EPS and estimated 2019 EPS for SJW, the analysis indicated the following ranges of implied equity value per share for the SJW common stock (rounded to the nearest $0.25):

The ranges of implied equity value per share for SJW were compared to the closing price per share of SJW common stock of $53.94 on March 9, 2018.

Discounted Cash Flow Analysis

J.P. Morgan conducted a discounted cash flow analysis for the purpose of determining an implied fully diluted equity value per share for the SJW common stock.

J.P. Morgan calculated the present value of unlevered free cash flows for SJW (i) for the calendar years 2018 through 2022 using unlevered free cash flows that were based upon the SJW projections and were reviewed and approved by the management of SJW for use by J.P. Morgan in connection with its financial analyses and rendering its fairness opinion and (ii) for the calendar years 2023 through 2027 using unlevered free cash flows that were derived from a rate base model and were reviewed and approved by the management of SJW in connection with J.P. Morgan’s financial analyses and rendering its fairness opinion. J.P. Morgan also calculated a range of terminal values for SJW at December 31, 2027 by applying a terminal growth rate ranging from 1.25% to 1.75% to the unlevered free cash flows of SJW for calendar year 2027, which were adjusted by the management of SJW for valuation purposes. The unlevered free cash flows and the range of terminal values were then discounted to present values using a range of discount rates from 5.25% to 5.75%. The present values were then adjusted for SJW’s 2017 fiscal year end total debt and cash to derive implied equity values for SJW. The discount rate range was based upon J.P. Morgan’s analysis of the weighted average cost of capital for SJW determined by applying the Capital Asset Pricing Model and based on considerations J.P. Morgan deemed relevant in its professional judgment and experience, including target capital structures, yields for U.S. Treasury notes, levered and unlevered betas for SJW and the selected publicly traded companies identified above, market risk premium and tax rates.

This analysis indicated the following range of implied equity value per share for the SJW common stock, rounded to the nearest $0.25.

The range of implied equity values per share for the SJW common stock was compared to the closing price per share of SJW common stock of $53.94 on March 9, 2018.

Other Information

Historical Trading Range

For reference only and not as a component of its fairness analysis, J.P. Morgan reviewed the trading range for the SJW common stock for the 52-week period ending March 9, 2018, which was $45.39 per share to $69.29 per share, and compared that to the closing price per share of SJW common stock of $53.94 on March 9, 2018.

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Analyst Price Targets

For reference only and not as a component of its fairness analysis, J.P. Morgan also reviewed certain publicly available equity research analyst share price targets for the SJW common stock and noted that such price target was $63.00 per share, and compared that to the closing price per share of SJW common stock of $53.94 on March 9, 2018.

Relative Value Analysis

Based upon the implied equity values per share for CTWS and SJW calculated above in “— Analysis of CTWS — Public Trading Multiples Analysis,” “— Analysis of CTWS — Discounted Cash Flow Analysis,” “— Analysis of SJW — Public Trading Multiples Analysis,” and “— Analysis of SJW — Discounted Cash Flow Analysis,” J.P. Morgan calculated a range of implied exchange ratios based on a comparison of a share of CTWS common stock to a share of SJW common stock, as shown in the table below. For each comparison, J.P. Morgan divided the highest equity value per share for CTWS by the lowest equity value per share for SJW to derive the highest exchange ratio implied by each set of reference ranges. J.P. Morgan also divided the lowest equity value per share for CTWS by the highest equity value per share for SJW to derive the lowest exchange ratio implied by each set of reference ranges. The implied exchange ratios resulting from J.P. Morgan’s analysis were:

The implied exchange ratios for CTWS and SJW were compared to (1) the exchange ratio of .9488 of a share of SJW common stock for a share of CTWS common stock, based on the respective closing prices per share on March 9, 2018 and (2) the proposed exchange ratio of 1.1375 shares of SJW common stock for a share of CTWS common stock in the merger.

Miscellaneous

The foregoing summary of certain material financial analyses does not purport to be a complete description of the analyses or data presented by J.P. Morgan. The preparation of a fairness opinion is a complex process and is not necessarily susceptible to partial analysis or summary description. J.P. Morgan believes that the foregoing summary and its analyses must be considered as a whole and that selecting portions of the foregoing summary and these analyses, without considering all of its analyses as a whole, could create an incomplete view of the processes underlying the analyses and its opinion. As a result, the ranges of valuations resulting from any particular analysis or combination of analyses described above were merely utilized to create points of reference for analytical purposes and should not be taken to be the view of J.P. Morgan with respect to the actual value of SJW or CTWS. The order of analyses described does not represent the relative importance or weight given to those analyses by J.P. Morgan. In arriving at its opinion, J.P. Morgan did not attribute any particular weight to any analyses or factors considered by it and did not form an opinion as to whether any individual analysis or factor (positive or negative), considered in isolation, supported or failed to support its opinion. Rather, J.P. Morgan considered the totality of the factors and analyses performed in determining its opinion.

Analyses based upon forecasts of future results are inherently uncertain, as they are subject to numerous factors or events beyond the control of the parties and their advisors. Accordingly, forecasts and analyses used or made by J.P. Morgan are not necessarily indicative of actual future results, which may be significantly more or less favorable than suggested by those analyses. Moreover, J.P. Morgan’s analyses are not and do not purport to be appraisals or otherwise reflective of the prices at which businesses actually could be acquired or sold. None of the selected companies reviewed as described in the above summary is identical to SJW or CTWS. However, the companies selected were chosen because they are publicly traded companies with operations and businesses that,

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for purposes of J.P. Morgan’s analysis, may be considered similar to those of SJW and CTWS. The analyses necessarily involve complex considerations and judgments concerning differences in financial and operational characteristics of the companies involved and other factors that could affect the companies compared to SJW and CTWS.

As a part of its investment banking business, J.P. Morgan and its affiliates are continually engaged in the valuation of businesses and their securities in connection with mergers and acquisitions, investments for passive and control purposes, negotiated underwritings, secondary distributions of listed and unlisted securities, private placements, and valuations for corporate and other purposes. J.P. Morgan was selected to advise SJW with respect to the merger on the basis of, among other things, such experience and its qualifications and reputation in connection with such matters and its familiarity with SJW, CTWS and the industries in which they operate.

For services rendered in connection with the merger (including the delivery of its opinion), SJW agreed to pay J.P. Morgan certain fees, which are payable in installments as follows: (i) $1.5 million, upon the delivery of a fairness opinion by J.P. Morgan, (ii) a fee equal to $2.5 million upon receipt of the upon receipt of approval by the stockholders of SJW of the issuance of shares of SJW common stock in the merger and the SJW certificate of incorporation amendment and (iii) a fee equal to $3.5 million upon the consummation of the merger. Also, at its sole discretion, SJW may pay J.P. Morgan a discretionary fee of $2.5 million based on its evaluation of J.P. Morgan’s performance under the engagement letter, upon the consummation of the merger. In addition, SJW has agreed to reimburse J.P. Morgan for its expenses incurred in connection with its services, including the fees and disbursements of counsel, and will indemnify J.P. Morgan against certain liabilities arising out of J.P. Morgan’s engagement.

During the two years preceding the date of J.P. Morgan’s opinion, J.P. Morgan and its affiliates have not had any other material financial advisory or other material commercial or investment banking relationships with SJW or CTWS. In the ordinary course of their businesses, J.P. Morgan and its affiliates may actively trade the debt and equity securities of SJW or CTWS for their own accounts or for the accounts of customers and, accordingly, they may at any time hold long or short positions in such securities or other financial instruments.

Financial Forecasts Regarding SJW and CTWS

The management forecasts furnished to J.P. Morgan by SJW regarding SJW for the fiscal years ending December 31, 2018 through December 31, 2022 were prepared by the management of SJW (the “SJW projections”) and were reviewed and approved by the management of SJW for use by J.P. Morgan in connection with its financial analyses and rendering its fairness opinion (see the section entitled “Unaudited Financial Forecasts — Certain Financial Projections Utilized by the SJW Board of Directors and SJW’s Financial Advisor” beginning on page 97 of this joint proxy statement/prospectus for more information). The management forecasts furnished to J.P. Morgan by SJW regarding CTWS were prepared by the management of CTWS and were reviewed and approved by the management of SJW for use by J.P. Morgan in connection with its financial analyses and rendering its fairness opinion (see the section entitled “Unaudited Financial Forecasts — Certain Financial Projections Utilized by the CTWS Board of Directors and CTWS’s Financial Advisor” beginning on page 97 of this joint proxy statement/prospectus for more information). Neither SJW nor CTWS publicly discloses long-term projections as to future revenues, earnings or other results of the type provided to J.P. Morgan in connection with J.P. Morgan’s analysis of the merger, and such forecasts were not prepared with a view toward public disclosure or soliciting proxies. These forecasts were based on numerous variables and assumptions that are inherently uncertain and may be beyond the control of SJW and CTWS, including, without limitation, factors related to general economic and competitive conditions and prevailing interest rates. As a result, actual results may differ materially from those contained in the financial projections. For more information regarding the use of forecasts, please refer to the sections entitled “— Unaudited Financial Forecasts — Certain Financial Projections Utilized by the SJW Board of Directors and SJW’s Financial Advisor” beginning on page 97 in this joint proxy statement/prospectus.

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CTWS’s Reasons for the Merger; Recommendation of the CTWS Board of Directors

The CTWS board of directors and CF&I committee held multiple meetings after receiving SJW’s proposal on December 8, 2017 during which SJW’s proposal and other strategic alternatives available to CTWS were evaluated and considered. CTWS’s outside legal counsel, Sullivan & Cromwell, and financial advisor, Wells Fargo Securities, participated in portions of many of such meetings. At certain of these meetings, the CTWS board of directors met in executive session without management or any advisors present.

After careful consideration, at a meeting held on March 14, 2018, the CTWS board of directors unanimously (i) determined that the merger agreement and the consummation of the transactions contemplated thereby, including the merger, are in the best interests of CTWS and its shareholders, (ii) declared advisable the merger agreement and the transactions contemplated thereby, including the merger, and (iii) approved and adopted the merger agreement and the transactions contemplated thereby, including the merger. The CTWS board of directors also unanimously recommended that CTWS shareholders approve the merger agreement at the CTWS special meeting.

In the course of evaluating the merger and reaching its decision to approve the merger agreement and recommend that its shareholders approve the merger agreement, the CTWS board of directors consulted with CTWS management and legal and financial advisors and considered a number of factors, both positive and negative, and a substantial amount of information.

The CTWS board of directors considered the following principal factors that weighed positively in favor of its decision to approve and recommend the merger:

Economic Terms of the Transaction

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Financial Characteristics of the Combined Company

Operational Considerations for CTWS

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Governance Terms of the Transaction

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Other Transaction Terms

The CTWS board of directors also weighed the factors described above against a number of risks and other factors identified in its deliberations as weighing negatively against the merger, including:

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The CTWS board of directors was also apprised of certain interests in the merger of CTWS’s directors and executive officers that may be different from, or in addition to, the interests of CTWS shareholders generally as discussed in “— Interests of CTWS Directors and Executive Officers in the Merger.”

After careful consideration of the Eversource proposal as compared to the proposed merger with SJW, at a meeting held on April 19, 2018, the non-employee directors of the CTWS board of directors unanimously reaffirmed its recommendation that CTWS shareholders approve the merger agreement at the CTWS special meeting. In the course of reaching its decision to reaffirm its recommendation, the CTWS board of directors consulted with CTWS management and legal and financial advisors and considered a number of factors and a substantial amount of information.

The reasons that the CTWS board of directors continues to believe that the proposed merger with SJW is in the best interests of CTWS shareholders and has significant long-term benefits for CTWS’s customers, employees and communities, include, among other things, that:

Further, in considering the Eversource proposal, the CF&I committee discussed the financial and strategic benefits of the proposed merger with SJW as compared to the Eversource proposal, including, among other things, that:

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This discussion of the information and factors considered by the CTWS board of directors in reaching its conclusions and recommendation summarizes the material factors considered by the board, but is not intended to be exhaustive or presented in any relative order of importance. In view of the wide variety of factors considered in connection with its evaluation of the proposed merger and the complexity of these matters, the CTWS board of directors did not find it practicable, and did not attempt, to quantify, rank or assign any relative or specific weights to the various factors that it considered in reaching its determination to approve the merger agreement and to recommend that CTWS shareholders vote in favor of the proposal to approve the merger agreement. In addition, individual members of the CTWS board of directors may have given differing weights to different factors. The CTWS board of directors conducted an overall review of the factors described above and based its recommendation on the totality of the information presented.

Portions of this explanation of the reasons for the merger and other information presented in this section are forward-looking in nature and, therefore, should be read in light of the matters described in the section entitled “Special Note Regarding Forward-Looking Statements” beginning on page 25 of this joint proxy statement/prospectus.

The CTWS board of directors unanimously approved the merger agreement and determined that the merger agreement and the transactions contemplated thereby, including the merger, are advisable and in the best interests of CTWS and its shareholders. The CTWS board of directors unanimously recommends that CTWS shareholders vote “FOR” the proposal to approve the merger agreement, “FOR” the proposal to approve, on a non-binding advisory basis, specific compensatory arrangements between CTWS and its named executive officers relating to the merger and “FOR” the proposal to adjourn the CTWS special meeting, if necessary or appropriate, to solicit additional proxies if there are not sufficient votes to approve the merger agreement.

Opinion of CTWS’s Financial Advisor — Opinion of Wells Fargo Securities, LLC

Pursuant to an engagement letter dated January 27, 2017, CTWS retained Wells Fargo Securities as the financial advisor to the CTWS board of directors in connection with a review of potential strategic alternatives, which would include a potential transaction with SJW.

On March 14, 2018, Wells Fargo Securities rendered its oral opinion to the CTWS board of directors, which was subsequently confirmed in writing by delivery of Wells Fargo Securities’ written opinion dated the same date, that, as of March 14, 2018, the exchange ratio in the proposed merger was fair, from a financial point of view, to the holders of CTWS common stock, other than the excluded shares.

Wells Fargo Securities’ opinion was for the information and use of the CTWS board of directors (in its capacity as such) in connection with its evaluation of the proposed merger. Wells Fargo Securities’ opinion only addressed the fairness, from a financial point of view, to the holders of CTWS common stock, other than the excluded shares, of the exchange ratio in the proposed merger pursuant to the merger agreement and did not

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address any other aspect or implication of the proposed merger. The summary of Wells Fargo Securities’ opinion in this joint proxy statement/prospectus is qualified in its entirety by reference to the full text of its written opinion, which is included as Annex C to this joint proxy statement/prospectus and sets forth the procedures followed, assumptions made, matters considered and limitations and qualifications on the review undertaken by Wells Fargo Securities in connection with the preparation of its opinion. However, neither Wells Fargo Securities’ written opinion nor the summary of its opinion and the related analyses set forth in this joint proxy statement/prospectus is intended to be, and they do not constitute, advice or a recommendation to the CTWS board of directors or any holder of CTWS common stock as to how such holder should vote or act on any matter relating to the proposed merger.

In arriving at its opinion, Wells Fargo Securities, among other things:

In connection with its review, Wells Fargo Securities did not independently verify any of the foregoing information, and Wells Fargo Securities assumed and relied upon such information being complete and accurate in all respects. Wells Fargo Securities was advised, and at CTWS’s direction, assumed, that the CTWS projections and the SJW projections were reasonably prepared on bases reflecting the best currently available estimates and judgments of the managements of CTWS and SJW as to the respective future financial performance of CTWS and SJW. At CTWS’s direction, Wells Fargo Securities further assumed that the CTWS projections and SJW projections were a reasonable basis upon which to evaluate CTWS, SJW and the proposed merger and used and relied upon such forecasts for purposes of its analyses and opinion. Wells Fargo Securities expressed no view or opinion with respect to the CTWS projections and the SJW projections or the assumptions upon which they were based.

Neither CTWS nor SJW publicly discloses internal management projections of the type provided to Wells Fargo Securities in connection with Wells Fargo Securities’ analysis of the proposed merger, and the CTWS projections and SJW projections were not prepared with a view toward public disclosure. The CTWS projections and SJW projections were based on numerous variables and assumptions that are inherently uncertain and may be beyond the control of management, including, without limitation, factors related to general economic and competitive conditions and prevailing interest rates. Accordingly, actual results could vary significantly from those set forth in the CTWS projections and SJW projections. For more information regarding the use of the CTWS projections and SJW projections, please refer to the section entitled “— Unaudited Financial Forecasts — Certain Financial Projections Utilized by the CTWS Board of Directors and CTWS’s Financial Advisor” beginning on page 97 of this joint proxy statement/prospectus.

For purposes of its analyses and opinion, Wells Fargo Securities, at CTWS’s direction, assumed that, in the course of obtaining any regulatory or third party consents, approvals or agreements in connection with the

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proposed merger, no delay, limitation, restriction or condition would be imposed that would have an adverse effect on CTWS, SJW or the contemplated benefits of the proposed merger that was material to Wells Fargo Securities’ analyses or opinion. Wells Fargo Securities also assumed that the proposed merger would be consummated in compliance with all applicable laws and regulations and in accordance with the terms of the merger agreement without waiver, modification or amendment of any term, condition or agreement thereof that was material to its analyses or opinion and that the final form of the merger agreement would not differ from the draft reviewed by Wells Fargo Securities in any respect material to its analyses or opinion. In addition, Wells Fargo Securities was not requested to make, and did not make, an independent evaluation or appraisal of the assets or liabilities (contingent or otherwise) of CTWS or SJW, nor was Wells Fargo Securities furnished with any such evaluations or appraisals. Wells Fargo Securities did not undertake any independent analysis of any potential or actual litigation or claims, regulatory action, possible unasserted claims or other contingent assets or liabilities, to which CTWS or SJW was or may have been a party or was or may have been subject, or of any governmental investigation of any possible unasserted claims or other contingent liabilities to which CTWS or SJW was or may have been a party or was or may have been subject.

Wells Fargo Securities’ opinion only addressed the fairness, from a financial point of view, to the holders of CTWS common stock, other than the excluded shares, of the exchange ratio in the proposed merger pursuant to the merger agreement and did not address any other aspect or implication (financial or otherwise) of the proposed merger, or any other agreement, arrangement or understanding entered into in connection with the proposed merger or otherwise, including, without limitation, the fairness of the amount or nature of, or any other aspect relating to, any compensation or consideration to be received by or otherwise payable to any officers, directors or employees of any party to the proposed merger, or class of such persons, relative to the exchange ratio or otherwise. Furthermore, Wells Fargo Securities did not express any advice or opinion regarding matters that require legal, regulatory, accounting, insurance, tax, environmental, executive compensation or other similar professional advice. Wells Fargo Securities assumed that CTWS had or would obtain such advice or opinions from appropriate professional sources.

Wells Fargo Securities’ opinion was necessarily based upon information made available to Wells Fargo Securities as of the date of its opinion and financial, economic, market and other conditions as they existed and could be evaluated on the date of its opinion. Wells Fargo Securities did not undertake, and is under no obligation, to update, revise, reaffirm or withdraw its opinion, or otherwise comment on or consider events occurring or coming to its attention after the date of its opinion. Wells Fargo Securities’ opinion did not address the relative merits of the proposed merger as compared to any alternative transactions or strategies that might have been available to CTWS, nor did it address the underlying business decision of the CTWS board of directors or CTWS to proceed with or effect the proposed merger. Wells Fargo Securities also did not express any opinion as to the price at which the CTWS common stock or the SJW common stock may be traded at any time.

Financial Analyses

In preparing its opinion to the CTWS board of directors, Wells Fargo Securities performed a variety of analyses, including those described below. The summary of Wells Fargo Securities’ analyses is not a complete description of the analyses underlying Wells Fargo Securities’ opinion. The preparation of such an opinion is a complex process involving various quantitative and qualitative judgments and determinations with respect to the financial, comparative and other analytical methods employed and the adaptation and application of these methods to the unique facts and circumstances presented. As a consequence, neither Wells Fargo Securities’ opinion nor its underlying analyses is readily susceptible to summary description. Wells Fargo Securities arrived at its opinion based on the results of all analyses undertaken by it and assessed as a whole and did not draw, in isolation, conclusions from or with regard to any individual analysis, methodology or factor. Accordingly, Wells Fargo Securities believes that its analyses and the following summary must be considered as a whole and that selecting portions of its analyses, methodologies and factors, without considering all analyses, methodologies and factors or the narrative description of the analyses, could create a misleading or incomplete view of the processes underlying Wells Fargo Securities’ analyses and opinion.

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In performing its analyses, Wells Fargo Securities considered general business, economic, industry and market conditions, financial and otherwise, and other matters as they existed on, and could be evaluated as of, the date of its opinion. None of the selected companies used in Wells Fargo Securities’ analyses is identical to CTWS or SJW and an evaluation of the results of those analyses is not entirely mathematical. The financial analyses performed by Wells Fargo Securities were performed for analytical purposes only and are not necessarily indicative of actual values or predictive of future results or values, which may be significantly more or less favorable than those suggested by the analyses. In addition, any analyses relating to the value of assets, businesses or securities do not purport to be appraisals or to reflect the prices at which businesses or securities actually may be sold, which may depend on a variety of factors, many of which are beyond the control of CTWS or SJW.

While the results of each analysis were taken into account in reaching its overall conclusion with respect to fairness, Wells Fargo Securities did not make separate or quantifiable judgments regarding individual analyses. Much of the information used in, and accordingly the results of, Wells Fargo Securities’ analyses are inherently subject to substantial uncertainty.

Wells Fargo Securities’ opinion was only one of many factors considered by the CTWS board of directors in evaluating the proposed merger. Neither Wells Fargo Securities’ opinion nor its analyses were determinative of the exchange ratio or of the views of the CTWS board of directors or management with respect to the proposed merger or the exchange ratio. The type and amount of consideration payable in the proposed merger were determined through negotiations between CTWS and SJW, and the decision to enter into the merger agreement was solely that of the CTWS board of directors.

The following is a summary of the material financial analyses performed by Wells Fargo Securities in connection with the preparation of its opinion rendered to, and reviewed with, the CTWS board of directors on March 14, 2018. The order of the analyses summarized below does not represent relative importance or weight given to those analyses by Wells Fargo Securities. The analyses summarized below include information presented in tabular format. The tables alone do not constitute a complete description of the analyses. Considering the data in the tables below without considering the full narrative description of the analyses, as well as the methodologies underlying, and the assumptions made, procedures followed, matters considered and limitations and qualifications affecting, each analysis, could create an incomplete view of Wells Fargo Securities’ analyses.

The estimates of the future financial performance of the selected companies listed below were based on certain publicly available research analyst estimates for those companies and the estimates of the future financial performance of CTWS and SJW relied upon for the financial analyses described below were based on the CTWS projections and the SJW projections, respectively.

Selected Companies Analysis

Wells Fargo Securities reviewed certain data for selected companies with publicly traded equity securities that Wells Fargo Securities deemed relevant. None of the selected companies used in Wells Fargo Securities’ analyses is identical to CTWS or SJW. The selected companies were selected by Wells Fargo Securities because they are comparably-sized, U.S. investor-owned public regulated water utilities and were deemed by Wells Fargo Securities similar to CTWS and SJW in one or more respects, including, among other things, services offered, customers, end-markets and financial performance.

The financial data reviewed for CTWS and SJW included:

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CTWS

For CTWS, the selected companies and median, mean, high and low of such financial data for the selected companies were:

Taking into account the results of the selected companies analysis, Wells Fargo Securities applied multiple ranges of 22.5x to 27.0x to CTWS’s 2018E EPS and 20.5x to 25.0x to CTWS’s 2019E EPS. The selected companies analysis indicated the following implied price per share reference ranges for CTWS common stock:

The implied price per share reference ranges were then compared to CTWS’s closing price per share of $52.19 as of March 13, 2018 and the implied offer price per share of $61.62, based on the proposed exchange ratio of 1.1375x.

SJW

For SJW, the selected companies and median, mean, high and low of such financial data for the selected companies were:

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Taking into account the results of the selected companies analysis, Wells Fargo Securities applied multiple ranges of 22.5x to 28.0x to SJW’s 2018E EPS and 20.5x to 26.0x to SJW’s 2019E EPS. The selected companies analysis indicated the following implied price per share reference ranges for SJW common stock:

The implied price per share reference ranges were then compared to SJW’s closing price per share of $54.17 as of March 13, 2018.

Discounted Cash Flow Analysis

Wells Fargo Securities performed a discounted cash flow analysis for each of CTWS and SJW by calculating the estimated net present value (as of January 1, 2018) of the projected unlevered free cash flows of each of CTWS and SJW for the calendar years ending December 31, 2018 through December 31, 2022, based on the CTWS projections and the SJW projections, respectively. Unlevered free cash flows were calculated as EBITDA (earnings before interest, taxes, depreciation and amortization) less cash taxes, capital expenditures and increases in net working capital.

CTWS

For CTWS’s discounted cash flow analysis, Wells Fargo Securities applied a perpetuity growth rate of 1.50% and discount rates ranging from 5.65% to 6.70%, which were chosen by Wells Fargo Securities based on its experience and professional judgment taking into account an analysis of CTWS’s weighted average cost of capital. The discounted cash flow analysis indicated the following implied price per share reference range for CTWS common stock:

The implied price per share reference range was then compared to CTWS’s closing price per share of $52.19 as of March 13, 2018 and the implied offer price per share of $61.62, based on the proposed exchange ratio of 1.1375x.

SJW

For SJW’s discounted cash flow analysis, Wells Fargo Securities applied a perpetuity growth rate of 2.00% and discount rates ranging from 6.21% to 6.93%, which were chosen by Wells Fargo Securities based on its experience and professional judgment taking into account an analysis of SJW’s weighted average cost of capital. The discounted cash flow analysis indicated the following implied price per share reference range for SJW common stock:

The implied price per share reference range was then compared to SJW’s closing price per share of $54.17 as of March 13, 2018.

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Exchange Ratio Analysis

Based upon the implied price per share for each of CTWS and SJW as described above under “— Selected Companies Analysis” and “— Discounted Cash Flow Analysis” and the fully diluted shares of CTWS common stock and SJW common stock, as provided by the managements of CTWS and SJW, respectively, Wells Fargo Securities calculated the implied exchange ratio reference ranges per share of CTWS common stock to a share of SJW common stock.

Wells Fargo Securities calculated the implied exchange ratios for CTWS by dividing the low end of each range of the implied price per share of CTWS common stock by the high end of each range of the implied price per share of SJW common stock and by dividing the high end of each range of the implied price per share of CTWS common stock by the low end of each range of the implied price per share of SJW common stock. The exchange ratio analysis indicated the following implied exchange ratio reference ranges for CTWS: