Press Release

Cal Water CFO to Speak at A.G. Edwards Yield Conference

SAN JOSE, Calif.--(BUSINESS WIRE)--May 11, 2007--Martin A. Kropelnicki, Chief Financial Officer and Treasurer of California Water Service Group (Cal Water) (NYSE:CWT), will give a presentation about the company at the A.G. Edwards Yield Conference on Tuesday, May 15, 2007, at 10:30 a.m. Eastern time at the New York Palace hotel in New York City.

Kropelnicki's presentation will be webcast live from Cal Water's web site at Participants can listen to the audio webcast and view presentation slides by clicking on the event name, which is listed on the Calendar of Events page under the Investor Relations section. The webcast also will be archived on Company's web site for one year following the presentation.

California Water Service Group is the parent company of California Water Service Company, Washington Water Service Company, New Mexico Water Service Company, Hawaii Water Service Company, Inc., and CWS Utility Services. The subsidiaries provide regulated and non-regulated water service to over 2 million people in 100 communities. The Company's common stock trades on the New York Stock Exchange under the symbol "CWT." Additional information about the company is available online at

CONTACT: California Water Service Group
Media: Shannon Dean, 310-257-1435
Analysts: Marty Kropelnicki, 408-367-8200

SOURCE: California Water Service Group