Press Release

Cal Water Director of Corporate Communications to Speak at IncreMental Advantage Conference

SAN JOSE, Calif.--(BUSINESS WIRE)--Dec. 10, 2007--(NYSE: CWT) - Shannon Dean, Director of Corporate Communications of California Water Service Group (Cal Water), will give a presentation about the company at IncreMental Advantage's Profiting in the Water Industry Conference on Dec. 13, 2007, at 9:10 a.m. Pacific time at The Westin San Francisco Airport Hotel in Millbrae, Calif.

Dean's presentation slides will be available on the Company's web site at, on the Calendar of Events page under the Investor Relations section.

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 nearly 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