California Water Service Group is a holding company that provides water utility and other related services in California, Washington, New Mexico and Hawaii through its subsidiaries. It operates through supply and distribution of water, and providing water-related utility services segment. Its business comprises the production, purchase, storage, treatment, testing, distribution and sale of water for domestic, industrial, public and irrigation uses, and for fire protection. It provides non-regulated water-related services under agreements with municipalities and other private companies. The non-regulated services include water system operation, billing and meter reading services. Non-regulated operations also include the lease of communication antenna sites and lab services. Its subsidiaries include California Water Service Company, New Mexico Water Service Company, Washington Water Service Company, Hawaii Water Service Company, Inc., CWS Utility Services and HWS Utility Services LLC.