California Water Service Group to Hold First Quarter Earnings Results Analyst Teleconference.

SAN JOSE, Calif. -- California Water Service Group (NYSE:CWT) will hold its first quarter earnings analyst teleconference to discuss first quarter 2005 results on Thursday, April 28, 2005, at 4 p.m. Eastern Time (1 p.m. Pacific Time).

This call is being webcast by Thomson/CCBN and can be accessed at California Water Service Group's web site at www.calwatergroup.com. Participants can also call toll- free [phone] and enter ID No. 679647.

The webcast is also being distributed through the Thomson StreetEvents Network. Individual investors can listen to the call at www.earnings.com, Thomson's individual investor portal, powered by StreetEvents. Institutional investors can access the call via Thomson StreetEvents (www.streetevents.com), a password-protected event management site.

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. 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."