Other Events On July 29, 2026, 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 $0.3350 per common share. The quarterly dividend will be payable on August 21, 2026 to stockholders of record as of the close of business on August 10, 2026.

Results of Operations and Financial Condition On July 29, 2026, California Water Service Group (the “Company”) issued a press release (a copy of which is attached hereto as Exhibit 99.1 and incorporated herein by reference) announcing its financial results for the second quarter of 2026, ended June 30, 2026. As announced, the Company will host a conference call on Thursday, July 30, 2026, at 11:00 am EDT to discuss financial results and management’s business outlook. The financial results ann…

Results of Operations and Financial Condition On April 29, 2026, California Water Service Group (the “Company”) issued a press release (a copy of which is attached hereto as Exhibit 99.1 and incorporated herein by reference) announcing its financial results for the first quarter of 2026, ended March 31, 2026. As announced, the Company will host a conference call on Thursday, April 30, 2026, at 11:00 am EDT to discuss financial results and management’s business outlook. The financial results a…

Other Events On April 29, 2026, 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 $0.3350 per common share. The quarterly dividend will be payable on May 22, 2026 to stockholders of record as of the close of business on May 11, 2026.

Results of Operations and Financial Condition On February 25, 2026, California Water Service Group (the “Company”) issued a press release (a copy of which is attached hereto as Exhibit 99.1 and incorporated herein by reference) announcing its financial results for the fourth quarter and year ended December 31, 2025. As announced, the Company will host a conference call on Thursday, February 26, 2026 at 11:00 am EDT to discuss financial results and management’s business outlook. The financial…

Other Events On February 25, 2026, the Company announced that it has entered into a definitive agreement to purchase Nexus Water Group’s Nevada and Oregon subsidiaries. The purchase price for the transaction is approximately $218 million, subject to certain closing adjustments. The Company will fund the acquisition with working capital and existing debt and equity facilities. The Company expects to consummate the transaction by the end of 2026, subject to customary closing conditions and regu…

Other Events On January 28, 2026, 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 $0.3350 per common share. The quarterly dividend will be payable on February 20, 2026 to stockholders of record as of the close of business on February 9, 2026.

Results of Operations and Financial Condition On October 30, 2025, California Water Service Group (the “Company”) issued a press release (a copy of which is attached hereto as Exhibit 99.1 and incorporated herein by reference) announcing its financial results for the third quarter of 2025, ended September 30, 2025. As announced, the Company will host a conference call on Thursday, October 30, 2025, at 11:00 am EDT to discuss financial results and management’s business outlook. The financial r…

Other Events On October 29, 2025, 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 $0.30 per common share. The quarterly dividend will be payable on November 21, 2025, to stockholders of record as of the close of business on November 10, 2025.

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant On October 1, 2025, California Water Service Group (“Group”) completed the sale and issuance of (i) $70 million principal amount of its 4.87% Senior Unsecured Notes, Series A, due October 1, 2032 (the “Series A Notes”) and (ii) $100 million principal amount of its 5.22% Senior Unsecured Notes, Series B, due October 1, 2035 (the “Series B Notes” and together with the Series A Notes…

Results of Operations and Financial Condition On July 31, 2025, California Water Service Group (the “Company”) issued a press release (a copy of which is attached hereto as Exhibit 99.1 and incorporated herein by reference) announcing its financial results for the second quarter of 2025, ended June 30, 2025. As announced, the Company will host a conference call on Thursday, July 31, 2025, at 11:00 am EDT to discuss financial results and management’s business outlook. The financial results ann…

Other Events On July 30, 2025, 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 $0.30 per common share. The quarterly dividend will be payable on August 22, 2025, to stockholders of record as of the close of business on August 11, 2025.

Entry into a Material Definitive Agreement. On May 14, 2025, California Water Service Group (the “ Company ”) entered into an equity distribution agreement (the “ Equity Distribution Agreement ”) with 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 and Samuel A. Ramirez & Company, Inc., each as sales agent and/or as Forward Seller (as defined below) (collective…

Results of Operations and Financial Condition On May 1, 2025, California Water Service Group (the “Company”) issued a press release (a copy of which is attached hereto as Exhibit 99.1 and incorporated herein by reference) announcing its financial results for the first quarter of 2025, ended March 31, 2025. As announced, the Company will host a conference call on Thursday, May 1, 2025, at 11:00 am EDT to discuss financial results and management’s business outlook. The financial results announc…

Other Events On April 30, 2025, 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 $0.30 per common share. The quarterly dividend will be payable on May 23, 2025, to stockholders of record as of the close of business on May 12, 2025.

Results of Operations and Financial Condition On February 27, 2025, California Water Service Group (the “Company”) issued a press release (a copy of which is attached hereto as Exhibit 99.1 and incorporated herein by reference) announcing its financial results for the 2024 fourth quarter and year ended December 31, 2024. As announced, the Company will host a conference call on Thursday, February 27, 2025, at 11:00 am EDT to discuss financial results and management’s business outlook. The fina…

Other Events On January 29, 2025, 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 $0.30 per common share and a one-time special dividend of $0.04 per common share. Both the quarterly dividend and one-time special dividend will be payable on February 21, 2025 to stockholders of record as of the close of business on February 10, 2025.

Other Events On October 30, 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 November 22, 2024 to stockholders of record as of the close of business on November 12, 2024.

Results of Operations and Financial Condition On October 31, 2024, California Water Service Group (the “Company”) issued a press release (a copy of which is attached hereto as Exhibit 99.1 and incorporated herein by reference) announcing its financial results for the third quarter of 2024, ended September 30, 2024. As announced, the Company will host a conference call on Thursday, October 31, 2024, at 11:00 am EDT to discuss financial results and management’s business outlook. The financial r…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant On October 22, 2024, California Water Service Company (“Cal Water”), a wholly owned subsidiary of California Water Service Group, completed the sale and issuance of $125 million principal amount of its 5.22% First Mortgage Bonds due October 22, 2054, Series 2 (the “Bonds”) pursuant to a Bond Purchase Agreement, dated October 22, 2024. Interest on the Bonds will accrue quarterly an…

Chief Human Resource Officer — Ronald D. Webb: The filing discloses a planned retirement of a senior officer (CHRO) with a stated expectation of a successor, representing an orderly succession rather than a sudden loss.

Results of Operations and Financial Condition On August 1, 2024, California Water Service Group (the “Company”) issued a press release (a copy of which is attached hereto as Exhibit 99.1 and incorporated herein by reference) announcing its financial results for the second quarter of 2024, ended June 30, 2024. As announced, the Company will host a conference call on Thursday, August 1, 2024, at 11:00 am EDT to discuss financial results and management’s business outlook. The financial results a…

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.

Results of Operations and Financial Condition On April 25, 2024, California Water Service Group (the “Company”) issued a press release (a copy of which is attached hereto as Exhibit 99.1 and incorporated herein by reference) announcing its financial results for the first quarter of 2024, ended March 31, 2024. As announced, the Company will host a conference call on Thursday, April 25, 2024, at 11:00 am EDT to discuss financial results and management’s business outlook. The financial results a…

Other Events On April 24, 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 May 17, 2024 to stockholders of record as of the close of business on May 6, 2024.