UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

Current Report Pursuant to Section 13or 15(d) of The Securities Exchange Act of 1934

Date of Report (date of earliest event reported): July31, 2024

CALIFORNIA WATER SERVICE GROUP

(Exact name of Registrant as Specified in its Charter)

(408) 367-8200

(Registrant’s telephone number, including area code)

N/A

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined by Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ¨

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 13(a) of the Exchange Act. ¨

Item 8.01. Other Events

On July 31, 2024, California Water Service Group issued a press release (a copy of which is attached hereto as Exhibit 99.1 and incorporated herein by reference) announcing the declaration of a quarterly dividend of $0.28 per common share that will be payable on August 23, 2024 to stockholders of record as of the close of business on August 12, 2024.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits.

We hereby file the following exhibit with this report:

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Exhibit 99.1

July 31, 2024

For immediate release

CALIFORNIA WATER SERVICE GROUP BOARD OF DIRECTORS

DECLARES 318TH CONSECUTIVE QUARTERLY DIVIDEND

SAN JOSE, Calif. – At its meeting on July 31, 2024, the California Water Service Group (NYSE: CWT) Board of Directors declared the company's 318th consecutive quarterly dividend in the amount of $0.28 per common share. It will be payable on August 23, 2024 to stockholders of record as of the close of business on August 12, 2024.

California Water Service Group is the parent company of regulated utilities California Water Service, Hawaii Water Service, New Mexico Water Service, and Washington Water Service, as well as Texas Water Service, a utility holding company. Together, these companies provide regulated and non-regulated water and wastewater service to more than 2.1 million people in California, Hawaii, New Mexico, Washington, and Texas. California Water Service Group’s common stock trades on the New York Stock Exchange under the symbol “CWT.” Additional information is available online at www.calwatergroup.com.

This news release contains forward-looking statements withinthe meaning established by the Private Securities Litigation Reform Act of 1995 (“PSLRA”). The forward-looking statementsare intended to qualify under provisions of the federal securities laws for “safe harbor” treatment established by the PSLRA.Forward-looking statements in this news release are based on currently available information, expectations, estimates, assumptions andprojections, and our management’s beliefs, assumptions, judgments and expectations about us, the water utility industry and generaleconomic conditions. These statements are not statements of historical fact. When used in our documents, statements that are not historicalin nature, including words like will, would, expects, intends, plans, believes, may, could, estimates, assumes, anticipates, projects,progress, predicts, hopes, targets, forecasts, should, seeks or variations of these words or similar expressions are intended to identifyforward-looking statements. Forward-looking statements are not guarantees of future performance. They are based on numerous assumptionsthat we believe are reasonable, but they are open to a wide range of uncertainties and business risks. Consequently, actual results mayvary materially from what is contained in a forward-looking statement. Factors that may cause actual results to be different than thoseexpected or anticipated include but are not limited to those described under the section entitled “Risk Factors” in our mostrecent Annual Report on Form 10-K, as such factors may be updated from time to time in our periodic filings with the Securities andExchange Commission. In light of these risks, uncertainties and assumptions, investors are cautioned not to place undue reliance on forward-lookingstatements, which speak only as of the date of this news release. We are not under any obligation, and we expressly disclaim any obligation,to update or alter any forward-looking statements, whether as a result of new information, future events or otherwise.

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Contact

James P. Lynch

408-367-8200 (analysts)

Shannon Dean

408-367-8243 (media)