Press Release

California Water Service Group Schedules Fourth Quarter and Year-End 2008 Earnings Results Announcement and Teleconference

SAN JOSE, CA, Feb 05, 2009 (MARKET WIRE via COMTEX) -- California Water Service Group (NYSE: CWT) today announced that its fourth quarter and year-end earnings results will be released after the market-close on Wednesday, February 25, 2009, and its teleconference will be held at 11:00 a.m. EST on Thursday, February 26, 2009.

All stockholders and interested investors are invited to listen to the teleconference. The 2008 fourth quarter and year-end conference call may be accessed by dialing 1-866-882-0695 and keying in ID# 1322231. A replay of the call will be available from 2:00 p.m. EST on Thursday, February 26, 2009, through April 27, 2009, at 888-266-2081, ID# 1322231. The call, which will be hosted by President and Chief Executive Officer Peter C. Nelson and Vice President and Chief Financial Officer Martin A. Kropelnicki, will also be webcast under the investor relations tab 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., CWS Utility Services, and HWS Utility Services. Together these companies provide regulated and non-regulated water service to more than 2 million people in 100 California, Washington, New Mexico and Hawaii communities. Group's common stock trades on the New York Stock Exchange under the symbol "CWT."

Contact:
Shannon Dean
(310) 257-1435

1720 North First Street
San Jose, CA 95112-4598

SOURCE: California Water Service Group