Company Information

Contact Information
Customer Support Services
(Corporate headquarters)
1720 North First Street
San Jose, CA 95112
(408) 367-8200

To contact your local Cal Water office or report a problem with your water, visit the Contact Us page. For corporate, investor, and employment information, visit the California Water Service Group web site.

California Water Service (Cal Water) is the largest regulated American water utility west of the Mississippi River and the third largest in the country. Formed in 1926, the San Jose-based company serves 497,700 customer connections in over 100 communities throughout the state.

Cal Water is the largest subsidiary of the California Water Service Group, which also includes Washington Water Service, New Mexico Water Service, Texas Water Service, and Hawaii Water Service. As a whole, the Group provides high-quality regulated and non-regulated utility services to more than 2 million people in 100 communities. Company-wide, our employees share a commitment to being the leading provider of water and wastewater services and delivering quality, service, and value to our customers.

To get assistance with your account or report a problem with your water, visit the Contact Us page.

About California Water Service Group

California Water Service Group has been named one of “America’s Most Responsible Companies” and “World’s Most Trustworthy Companies” by Newsweek and a Great Place to Work®.