CALIFORNIA WATER SERVICE GROUP
For the period ended Dec 31, 2025. Filed Feb 27, 2026.
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FY2025 · Filed Feb 27, 2026
CWT$50.16-1.7%Stored close · as of Nov 9, 2026
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Exhibit Index
Unless filed with this Form 10-K, the documents listed are incorporated by reference to the filings referred to:
| Exhibit Number | |
|---|---|
| 1.1 | Equity Distribution Agreement, dated as of May 14, 2025, between California Water Service Group and Robert W. Baird & Co. Incorporated, BofA Securities, Inc, Morgan Stanley & Co. LLC, Wells Fargo Securities, LLC, Janney Montgomery Scott LLC, RBC Capital Markets, LLC, Blaylock Van, LLC and Samuel A. Ramirez & Company, Inc., et al. (incorporated by reference to the Company’s Form 8-K filed May 15, 2025) |
| 3.1 | Certificate of Incorporation of California Water Service Group (Exhibit 3.1 to the Quarterly Report on Form 10-Q filed August 9, 2006) |
| 3.2 | Certificate of Amendment to Certificate of Incorporation of California Water Service Group (Exhibit 3.1 to the Current Report on Form 8-K filed June 10, 2011) |
| 3.3 | Certificate of Amendment to Amended Certificate of Incorporation of California Water Service Group (Exhibit 3.3 to the Quarterly Report on Form 10-Q filed July 28, 2022) |
| 3.4 | Certificate of Amendment to Amended Certificate of Incorporation of California Water Service Group (Exhibit 3.4 to the Quarterly Report on Form 10-Q filed July 27, 2023) |
| 3.5 | Amended and Restated Bylaws of California Water Service Group, as amended on February 28, 2024 (Exhibit 3.5 to the Annual Report on Form 10-K filed February 29, 2024) |
| 4.1 | Certificate of Designations regarding Series D Participating Preferred Stock, as filed with Delaware Secretary of State on September 16, 1999 (Exhibit 4.2 to Annual Report on Form 10-K for the year ended December 31, 2003) |
| 4.2 | Certificate of Elimination of the Series D Participating Preferred Stock, as filed with Delaware Secretary of State on February 27, 2019 (Exhibit 4.2 to Annual Report on Form 10-K for the year ended December 31, 2018) |
| 4.3 | Thirty-Ninth Supplemental Indenture dated as of April 17, 2009, between California Water Service Company and U.S. Bank National Association, as Trustee (Exhibit 4.1 to Current Report on Form 8-K filed April 21, 2009) |
| 4.4 | Forty-Third Supplemental Indenture dated as of April 17, 2009, between California Water Service Company and U.S. Bank National Association, as Trustee, covering 7.28% First Mortgage Bonds due 2025, Series AAA. (Exhibit 4.5 to Current Report on Form 8-K filed April 21, 2009) |
| 4.5 | Forty-Fourth Supplemental Indenture dated as of April 17, 2009, between California Water Service Company and U.S. Bank National Association, as Trustee, covering 6.77% First Mortgage Bonds due 2028, Series BBB. (Exhibit 4.6 to Current Report on Form 8-K filed April 21, 2009) |
| 4.6 | Forty-Fifth Supplemental Indenture dated as of April 17, 2009, between California Water Service Company and U.S. Bank National Association, as Trustee, covering 8.15% First Mortgage Bonds due 2030, Series CCC. (Exhibit 4.7 to Current Report on Form 8-K filed April 21, 2009) |
| 4.7 | Forty-Sixth Supplemental Indenture dated as of April 17, 2009, between California Water Service Company and U.S. Bank National Association, as Trustee, covering 7.13% First Mortgage Bonds due 2031, Series DDD. (Exhibit 4.8 to Current Report on Form 8-K filed April 21, 2009) |
| 4.8 | Forty-Seventh Supplemental Indenture dated as of April 17, 2009, between California Water Service Company and U.S. Bank National Association, as Trustee, covering 7.11% First Mortgage Bonds due 2032, Series EEE. (Exhibit 4.9 to Current Report on Form 8-K filed April 21, 2009) |
| 4.9 | Fifty-Seventh Supplemental Indenture dated as of April 17, 2009, between California Water Service Company and U.S. Bank National Association, as Trustee, covering 6.02% First Mortgage Bonds due 2031, Series OOO. (Exhibit 4.19 to Current Report on Form 8-K filed April 21, 2009) |
| 4.10 | Fifty-Eighth Supplemental Indenture dated as of November 22, 2010, between California Water Service Company and U.S. Bank National Association, as Trustee, covering 5.50% First Mortgage Bonds due 2040, Series PPP. (Exhibit 4.1 to Current Report on form 8-K filed November 22, 2010). |
| 4.11 | Sixty-Second Supplemental Indenture dated as of June 11, 2019, between California Water Service Company and U.S. Bank National Association, as Trustee, covering 3.40% First Mortgage Bonds due 2029, Series VVV, 4.07% First Mortgage Bonds due 2049, Series WWW, and 4.17% First Mortgage Bonds due 2059, Series YYY (Exhibit 10.1 to the Current Report on Form 8-K filed June 18, 2019) |
| 4.12 | Sixty-Third Supplemental Indenture dated as of May 11, 2021, between California Water Service Company and U.S. Bank National Association, as Trustee, covering 2.87% First Mortgage Bonds due 2051, Series ZZZ and 3.02% First Mortgage Bonds due 2061, Series 1 (Exhibit 10.1 to the Current Report on Form 8-K filed May 11, 2021) |
| Exhibit Number | |
|---|---|
| 4.13 | Sixty-Fourth Supplemental Indenture dated as of October 22, 2024, between California Water Service Company and U.S. Bank Trust Company, National Association, as trustee, covering 5.22% First Mortgage Bonds due 2054, Series 2 (Exhibit 10.1 to the Current Report on Form 8-K filed October 22, 2024) |
| 4.14 | Sixty-Fifth Supplemental Indenture dated as of October 1, 2025, between California Water Service Company and U.S. Bank Trust Company, National Association, as trustee, covering 5.64% First Mortgage Bonds due 2055, Series 3 (Exhibit 10.2 to the Current Report on Form 8-K filed October 3, 2025) |
| 4.15 | The Company agrees to furnish upon request to the Securities and Exchange Commission a copy of each instrument defining the rights of holders of long-term debt of the Company. |
| 10.1 | Water Supply Contract between Cal Water and County of Butte relating to Cal Water's Oroville District; Water Supply Contract between Cal Water and the Kern County Water Agency relating to Cal Water’s Bakersfield District; Water Supply Contract between Cal Water and Stockton East Water District relating to Cal Water's Stockton District. (Exhibits 5(g), 5(h), 5(i), 5(j), Registration Statement No. 2-53678, which exhibits are incorporated by reference to Annual Report on Form 10-K for the year ended December 31, 1974) |
| 10.2 | Water Supply Contract between the City and County of San Francisco and wholesale customers in Alameda County, San Mateo County and Santa Clara County for a term of twenty-five years beginning on July 1, 2009 and ending on June 30, 2034. The agreement was dated June 24, 2009. (Exhibit 10.3 to Quarterly Report on Form 10-Q for the quarter ending September 30, 2009). |
| 10.3 | Water Supply Contract dated July 1, 2009 between the City and County of San Francisco and California Water Service Company to provide water to Bear Gulch and Bayshore service areas for a term of twenty-five years beginning July 1, 2009 and ending June 30, 2034. (Exhibit 10.4 to Quarterly Report on Form 10-Q for the quarter ending September 30, 2009). |
| 10.4 | Water Supply Contract dated January 27, 1981, between Cal Water and the Santa Clara Valley Water District relating to Cal Water’s Los Altos District (Exhibit 10.3 to Annual Report on Form 10-K for the year ended December 31, 1992) |
| 10.5 | Amendments No. 3, 6 and 7 and Amendment dated June 17, 1980, to Water Supply Contract between Cal Water and the County of Butte relating to Cal Water’s Oroville District. (Exhibit 10.5 to Annual Report on Form 10-K for the year ended December 31, 1992) |
| 10.6 | Amendment dated May 31, 1977, to Water Supply Contract between Cal Water and Stockton East Water District relating to Cal Water’s Stockton District. (Exhibit 10.6 to Annual Report on Form 10-K for the year ended December 31, 1992) |
| 10.7 | Second Amended Contract dated September 25, 1987, among Stockton East Water District, California Water Service Company, the City of Stockton, the Lincoln Village Maintenance District, and the Colonial Heights Maintenance District Providing for the Sale of Treated Water. (Exhibit 10.7 to Annual Report on Form 10-K for the year ended December 31, 1987) |
| 10.8 | Water Supply Contract dated April 19, 1927, and Supplemental Agreement dated June 5, 1953, between Cal Water and Pacific Gas and Electric Company relating to Cal Water’s Oroville District. (Exhibit 10.9 to Annual Report on Form 10-K for the year ended December 31, 1992) |
| 10.9 | Water Supply Agreement dated September 25, 1996, between the City of Bakersfield and California Water Service Company. (Exhibit 10.18 to Quarterly Report on Form 10-Q for the quarter ended September 30, 1996) |
| 10.10 | Water Supply Contract dated November 16, 1994, between California Water Service Company and Alameda County Flood Control and Water Conservation District relating to Cal Water’s Livermore District (Exhibit 10.15 to Annual Report on Form 10-K for the year ended December 31, 1994) |
| 10.11 | California Water Service Group Directors’ Retirement Plan (As amended and restated on February 22, 2006) (Exhibit 10.14 to the Annual Report on Form 10-K for the year ended December 31, 2005) |
| 10.12 | Credit Agreement dated as of March 31, 2023 among California Water Service Group and certain of its subsidiaries from time to time party thereto, as borrowers, Bank of America, N.A., as administrative agent, swing line lender and letter of credit issuer, BofA Securities, Inc., as sole lead arranger and sole bookrunner, CoBank, ACB, and U.S. Bank National Association as co-syndication agents, Bank of China, Los Angeles Branch as documentation agent, and the other lender parties thereto (Exhibit 10.2 to the Current Report on Form 8-K filed April 5, 2023) |
| 10.13 | Credit Agreement dated as of March 31, 2023 among California Water Service Company as borrower, Bank of America, N.A., as administrative agent, swing line lender and letter of credit issuer, BofA Securities, Inc., as sole lead arranger and sole bookrunner, CoBank, ACB, and U.S. Bank National Association as co-syndication agents, Bank of China, Los Angeles Branch as documentation agent, and the other lender parties thereto (Exhibit 10.1 to the Current Report on Form 8-K filed April 5, 2023) |
| 10.14 | Executive Severance Plan (Exhibit 10.24 to Annual Report on Form 10-K for the year ended December 31, 1998)* |
| Exhibit Number | |
|---|---|
| 10.15 | California Water Service Group Deferred Compensation Plan effective January 1, 2001 (Exhibit 10.22 to Annual Report on Form 10-K for the year ended December 31, 2000)* |
| 10.16 | California Water Service Company Supplemental Executive Retirement Plan effective January 1, 2001 (Exhibit 10.23 to Annual Report on Form 10-K for the year ended December 31, 2000)* |
| 10.17 | Amendment No. 1 to California Water Service Company Supplemental Executive Retirement Plan effective January 1, 2001 (Exhibit 10.22 to Quarterly Report on Form 10-Q for the quarter ended September 30, 2004)* |
| 10.18 | Water Supply Contract 99-73 between the City of Bakersfield and California Water Service Company, dated March 31, 1999 (Exhibit 10.25 to Quarterly Report on Form 10-Q for the quarter ended September 30, 2003) |
| 10.19 | Amendment No. 1 to Water Supply Contract between the City of Bakersfield and California Water Service Company, dated October 3, 2001 (Exhibit 10.26 to Quarterly Report on Form 10-Q for the quarter ended September 30, 2003) |
| 10.20 | Amendment No. 2 to California Water Service Company Supplemental Executive Retirement Plan effective January 1, 2001 (Exhibit 10.27 to Quarterly Report on Form 10-Q for the quarter ended September 30, 2004)* |
| 10.21 | California Water Service Group 2024 Equity Incentive Plan (Exhibit 99.1 to the Registration Statement on Form S-8 filed May 29, 2024)* |
| 10.22 | The registrant’s policy on option repricing under its Equity Incentive Plan (incorporated by reference to Item 8.01 Other Events in the registrant's Current Report on Form 8-K dated April 7, 2005)* |
| 10.23 | Water Supply Contract dated September 21, 2005, between Cal Water and the Kern County Water Agency. (Exhibit 10.1 to Current Report on Form 8-K filed on September 21, 2005) |
| 10.24 | Form of Restricted Stock Award Grant Notice under the California Water Service Group Equity Incentive Plan. (Exhibit 10.36 to the Annual Report on Form 10-K for the year ended December 31, 2005) |
| 10.25 | Form of Restricted Stock Award Agreement under the California Water Service Group Equity Incentive Plan with Assignment Separate From Certificate and Joint Escrow Instructions. (Exhibit 10.38 to the Annual Report on Form 10-K for the year ended December 31, 2005) |
| 10.26 | Form of Indemnification Agreement to be entered between California Water Service Group and its directors and officers. (Exhibit 10.44 to the Annual Report on Form 10-K for the year ended December 31, 2006) |
| 10.27 | Note Purchase Agreement, dated as of October 1, 2025, by and among California Water Service Group and the several Purchasers named therein. (Exhibit 10.1 to the Current Report on Form 8-K filed October 3, 2025) |
| 19 | California Water Service Group Insider Trading Policy (Exhibit 19 to the Annual Report on Form 10-K filed February 27, 2025) |
| 21.0 | Subsidiaries of the Registrant |
| 22.1 | List of Subsidiary Issuers and Guarantors |
| 23.1 | Consent of Independent Registered Public Accounting Firm |
| 31.1 | Chief Executive Officer certification of financial statements pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 |
| 31.2 | Chief Financial Officer certification of financial statements pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 |
| 32.0 | Chief Executive Officer and Chief Financial Officer Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 |
| 97 | Incentive Compensation Clawback Policy (Exhibit 97 to the Annual Report on Form 10-K filed February 29, 2024) |
| 101 | The following materials from this Annual Report on Form 10-K formatted in iXBRL (Inline extensible Business Reporting Language): (i) Consolidated Balance Sheets, (ii) Consolidated Statements of Operations, (iii) Consolidated Statements of Comprehensive Income (iv) Consolidated Statements of Cash Flows, (v) Consolidated Statements of Equity and (vi) the Notes to the Consolidated Financial Statements. |
- Management contract or compensatory plan or arrangement.
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