Founded in 1926, California Water Service Company is one of the largest investor-owned water utilities in the United States. Based in San Jose, Calif., the company serves more than 460,000 customers through over 25 customer and operations centers throughout the state. It offers online subscription, cancellation and bill payment services. California Water Service Company operates the Low-Income Assistance Program that offers a monthly discount to low-income customers in California service areas. The company maintains a location in Stockton, Calif. California Water Service Company, also known as Cal Water is one of the largest subsidiaries of the California Water Service Group, which also includes Washington Water Service Company, New Mexico Water Service Company, Hawaii Water Service Company and CWS Utility Services.