California Water Service Group is a holding company. The Company operates through the supply and distribution of water and providing water-related utility services segment. The Company, through its subsidiaries, provides non-regulated services and non-regulated services to private companies and municipalities. The bulk of the business consists of the production, purchase, storage, treatment, testing, distribution and sale of water for domestic, industrial, public and irrigation uses, and for fire protection. It also provides non-regulated water-related services. The non-regulated services include water system operation, billing and meter reading services. Non-regulated operations also include the lease of communication antenna sites, lab services and promotion of other non-regulated services. The Company under its non-regulated contract arrangements, operates municipally owned water systems, privately owned water and recycled water distribution systems.