California Water Service (Cal Water) is the largest subsidiary of the California Water Service Group. Cal Water is the largest investor-owned American water utility west of the Mississippi River and the third largest in the country. Formed in 1926, the San Jose-based company serves more than 477,900 customers through 28 Customer and Operations Centers throughout the state.
Customer Support Services
(Corporate headquarters)
1720 North First Street
San Jose, CA 95112-4508
(408) 367-8200
infoGO@calwater.com