Cal Water President & CEO to Speak at NYSSA Water Conference

Peter C. Nelson, president & CEO of California Water Service Group (Cal Water) (NYSE:CWT), will give a presentation about the company at the New York Society of Security Analysts (NYSSA) Water Utility Conference on Dec. 6, 2007, at 11 a.m. Eastern time at the NYSSA office in New York City. Nelson’s presentation will not be webcast live; however, it will be included in the archived webcast available at www.nyssa.org a few days following the conference. The presentation can also be viewed from the Calendar of Events page on Cal Water’s web site at www.calwatergroup.com. 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 www.calwatergroup.com.