ANNUAL MEETING Fleet National Bank c/o EquiServe L.P. P.O. Box 43010 Providence, RI 02940-3010 (800) 736-3001 STOCK TRANSFER, DIVIDEND DISBURSING AND REINVESTMENT AGENT TO TRANSFER STOCK DIVIDEND DATES FOR 2002 The Annual Meeting of Stockholders will be held on Wednesday, April 24, 2002, at 10 a.m. at the Company’s Executive Office, located at 1720 North First Street in San Jose, California. Details of the business to be trans- acted during the meeting will be contained in the proxy material, which will be mailed to stockholders on or  about March 25, 2002. A change of ownership of shares (such as when stock is sold or gifted or when owners are deleted from or added to stock certificates) requires a transfer of stock. To transfer stock, the owner must complete the assignment on the back of the certificate and sign it exactly as his or her name appears on the front. This signature must be guaranteed by an eligible guarantor institution (banks, stock brokers, savings and loan associations and credit unions with membership in approved signature medallion programs) pursuant to SEC Rule 17Ad-15. A notary’s acknowledgement is not accept- able. This certificate should then be sent to EquiServe, L.P. Stockholder Services, by registered or certified mail with complete transfer instructions. US Bank Trust, N.A. One California Street San Francisco, CA 94111-5402 (415) 273-4580 California Water Service Group 1720 North First Street San Jose, CA 95112-4598 (408) 367-8200 EXECUTIVE OFFICE BOND REGISTRAR STOCKHOLDER INFORMATION ANNUAL REPORT FOR 2001 ON FORM 10-K Quarter Declaration Record Date Payment Date First January 30 February 8 February 22 Second April 24 May 6 May 20 Third July 24 August 5 August 19 Fourth October 23 November 4 November 18 A copy of the Company’s report for 2001 filed with the Securities and Exchange Commission on Form 10-K will be available in April 2002 and can be obtained by any stockholder at no charge upon written request to the address below. California Water Service Group Attn: Stockholder Relations 1720 North First Street San Jose, CA 95112-4598 (408) 367-8200 or (800) 750-8200 http://www.calwater.com Officers Board of Directors Corporate Information CALIFORNIA WATER SERVICE COMPANY Christine L. McFarlane Vice President, Human Resources Raymond H. Taylor Vice President, Operations Dan L. Stockton Vice President, Chief Information Officer Calvin L. Breed 1 Controller, Assistant Secretary and Assistant Treasurer Michael P. Ireland President Robert W. Foy 1, 2, 3 Chairman of the Board Peter C. Nelson 1, 2, 3 President and Chief Executive Officer Paul G. Ekstrom 4 Vice President, Customer Service and Corporate Secretary Gerald F. Feeney 1, 2, 3 Vice President, Chief Financial Officer and Treasurer Francis S. Ferraro 5 Vice President, Regulatory Matters and Corporate Development Robert R. Guzzetta 2 Vice President, Engineering and Water Quality WASHINGTON WATER SERVICE COMPANY 1 Holds the same position with California Water Service Group 2 Holds the same position with CWS Utility Services 3 Also an officer of Washington Water Service Company and New Mexico Water Service Company 4 Also Corporate Secretary of California Water Service Group, CWS Utility Services, Washington Water Service Company and New Mexico Water Service Company 5 Holds the same position with New Mexico Water Service Company Robert W. Foy* Chairman of the Board Peter C. Nelson* President and  Chief Executive Officer C.H. Stump # Former Chairman of the Board and CEO of California Water Service Company Langdon W. Owen † President, Don Owen & Associates; Member of the Board of Directors, Metropolitan Water District of Southern California Edward D. Harris, Jr.,M.D. $^{‡}$* George DeForest Barnett Professor of Medicine, Stanford University Medical Center Richard P. Magnuson †‡ Private Venture Capital Investor George A. Vera † Vice President and Chief Financial Officer, the David & Lucile Packard Foundation Linda R. Meier †‡ Member, National Advisory Board, Haas Public Service Center; Member of the Board of Directors, Greater Bay Bancorp Douglas M. Brown ‡ President and CEO of Tuition Plan Consortium; Chairman of Talbot Financial Services † Member of the Audit Committee ‡ Member of the Compensation Committee * Member of the Executive Committee # Director Emeritus California Water Service Group (Company) provides high-quality water utility services to 1.5 million people through its four subsidiaries: California Water Service Company (Cal Water), Washington Water Service Company (Washington Water), New Mexico Water Service Company (New Mexico Water) and CWS Utility Services. Regulated by state utility commissions, Cal Water and Washington Water provide water utility services to customers in 96 communities throughout California and Washington. New Mexico Water is nearing completion of its acquisition  of a regulated water utility in that state. CWS Utility Services conducts the Company’s non-regulated business, which includes providing billing and meter reading services, as well as full-system water operations, for cities and companies in California, Washington and New Mexico. DESIGN:Douglas Joseph Partners, Los Angeles