California Water Service Company

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Founded in 1926, California Water Service Group is a water and sewage company that provides various related services. Located in San Mateo, Calif., the firm serves over 460,000 customers through more than 28 customer and operations centers across the state. The company is one of the leading subsidiaries of the California Water Service Group, which includes Washington Water Service Company, New Mexico Water Service Company, Hawaii Water Service Company and CWS Utility Services. California Water Service Group offers its vast customer base an array of water conservation programs.