Corporate Information STOCK TRANSFER, DIVIDEND DISBURSING AND REINVESTMENT AGENT Fleet National Bank c/o EquiServe L.P. P.O. Box 43010 Providence, RI 02940-3010 (800) 736-3001 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 mem- bership in approved signature medallion programs) pursuant  to SEC Rule 17Ad-15. A notary’s acknowledgement is not acceptable.This certificate should then be sent to EquiServe, L. P. Stockholder Services, by registered or certified mail with complete transfer instructions. TO TRANSFER STOCK ANNUAL MEETING The Annual Meeting of Stockholders will be held on Wednesday, April 23, 2003, 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 transacted during the meeting will be contained in the proxy material, which will be mailed to stockholders on or about March 26, 2003. DIVIDEND DATES FOR 2003 Quarter Declaration Record Date Payment Date First January 29 February 7 February 21 Second April 23 May 2 May 16 Third July 23 August 1 August 15 Fourth October 22 October 31 November 14 A copy of the Company’s report for 2002 filed with the Securities and Exchange Commission (SEC) on Form 10-K will be available in April 2003 and can be obtained by any stockholder at no charge upon written request to the address below. The Company’s filings with the SEC can viewed via the link to the SEC’s EDGAR system on the Company’s web site. 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 ANNUAL REPORT FOR 2002 ON FORM 10-K STOCKHOLDER INFORMATION EXECUTIVE OFFICE BOND REGISTRAR 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 56 Officers CALIFORNIA WATER SERVICE COMPANY 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 Richard D. Nye  1,2,3 Vice President, Chief Financial Officer  and Treasurer Francis S. Ferraro  2,5 Vice President, Regulatory Matters and Corporate Development Robert R. Guzzetta  2 Vice President, Engineering and  Water Quality 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 J. Davey President WASHINGTON WATER SERVICE COMPANY NEW MEXICO WATER SERVICE COMPANY 1 Holds the same position with California Water Service Group 2 Also an officer of 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