{"url_path":"/sec/cwt/8-k/2026-05-21/cover-page","section_key":"cover-page","section_title":"Cover Page","topic":"sec","document":{"doc_type":"8-K","doc_date":"2026-05-21","source_url":"https://www.sec.gov/Archives/edgar/data/1035201/0001104659-26-065135-index.html","accession_number":"0001104659-26-065135","cik":"0001035201","ticker":"CWT","issuer_name":"CALIFORNIA WATER SERVICE GROUP","edgar_url":"https://www.sec.gov/Archives/edgar/data/1035201/0001104659-26-065135-index.html","primary_entity_key":"0001035201","primary_entity_name":"CALIFORNIA WATER SERVICE GROUP"},"word_count":310,"has_tables":true,"body_markdown":"false\n0001035201\n\n0001035201\n\n2026-05-20\n2026-05-20\n\niso4217:USD\n\nxbrli:shares\n\niso4217:USD\n\nxbrli:shares\n\n \n\n** **\n\n**UNITED STATES**\n\n**SECURITIES AND EXCHANGE COMMISSION**\n\n**Washington, D.C. 20549**\n\n \n\n**FORM 8-K**\n\n \n\n**Current Report Pursuant to Section 13\nor 15(d) of\nThe Securities Exchange Act of 1934**\n\n \n\nDate of Report (date of earliest event\nreported): **May 20, 2026**\n\n \n\n**CALIFORNIA WATER SERVICE GROUP**\n\n(Exact name of Registrant as Specified in its\nCharter) \n\n \n\n**Delaware**\n\n(State or other jurisdiction\nof incorporation)\n**1-13883**\n\n(Commission file number)\n**77-0448994**\n\n(I.R.S. Employer\nIdentification Number)\n\n \n\n**1720 North First Street**\n**San Jose, California**\n\n(Address of principal executive offices)\n**95112**\n\n(Zip Code)\n\n \n\n**(408) 367-8200**\n\n(Registrant’s telephone number, including\narea code)\n\n \n\n**N/A**\n\n(Former name or former address, if changed\nsince last report)\n\n \n\nCheck the appropriate box below if the Form 8-K filing\nis intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:\n\n \n\n¨\nWritten communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)\n\n \n \n\n¨\nSoliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)\n\n \n \n\n¨\nPre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act\n(17 CFR 240.14d-2(b))\n\n \n \n\n¨\nPre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act\n(17 CFR 240.13e-4(c))\n\n \n\nSecurities registered pursuant to Section 12(b) of\nthe Act:\n\n \n\n**Title of each class**\n \n**Trading Symbol(s)**\n \n**Name of each exchange on which registered**\n\nCommon Shares, par value $0.01\n \nCWT\n \nNew York Stock Exchange\n\n \n\nIndicate by check mark whether the registrant is an emerging\ngrowth company as defined by Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of\nthe Securities Exchange Act of 1934 (§240.12b-2 of this chapter).\n\n \n\nEmerging growth company ¨\n\n \n\nIf an emerging growth\ncompany, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or\nrevised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨"}