San Diego County CA Water Department

Find San Diego County, California water departments, districts, authorities, boards, and services. Water departments provide information on drinking water, treatment plants, sewage treatment, water conservation, and testing.


Encinitas Water Department MAGDALENA Clle Encinitas CA 92024


Escondido Waste Water 1521 S Hale Ave Escondido CA 92029 760-839-6290

Escondido Water Department 201 North Broadway Escondido CA 92025 760-839-4657

Olivehain Municipal Water Department 8833 HARMONY GROVE Rd Escondido CA 92025 760-839-5279

San Diego Water Department 600 B Street San Diego CA 92101 619-515-3500

Santee Water Department 10744 Rockville Street Santee CA 92071 619-258-6776

About San Diego County Water Departments

The San Diego County Water Department or Water Utility is a government agency or private company that operates a public water system, which provides potable tap water directly to residential, commercial, industrial, and institutional customers in San Diego County, CA.

You may contact the Water Department for questions about:
  • Water utility bills and payments
  • San Diego County drinking water
  • Drinking water quality testing and safety
  • Water treatment facilities in San Diego County, CA
San Diego County Water Utility Companies

Water Departments in San Diego County operate as an utility and are self-sustaining operations funded through user fees. San Diego County water rates may be subject to approval from a state regulatory authority such as a California Public Service Commission or Utility Control Authority.

Public Drinking Water

Water Departments, or Water Companies in San Diego County typically own the sources of drinking water they provide and must manage and maintain those sources and their surrounding areas. Surface sources include reservoirs, lakes, and rivers. San Diego County groundwater sources can be found in pockets beneath the ground, which can be accessed by drilling wells. Maintenance of San Diego County drinking water source sites and limitations on permitted activity around water sources helps minimize contamination. However, drinking water requires treatment prior to distribution to customers.

Water Treatment Facilities in San Diego County, CA

San Diego County water treatment facilities are used to remove contaminants and make drinking water safe for consumption. Treatment of water begins with the removal of the larger particles in the water through processes known as coagulation, flocculation, and sedimentation. After the large particles are removed, water is filtered through materials such as sand, gravel, and charcoal to remove dissolved particles. The final stage of treatment involves disinfection using chemicals or ultraviolet irradiation. San Diego County Water Departments may add fluoride to water at this stage as part of a community health effort to support oral health in the general population. Water Departments are responsible for the day-to-day operations and maintenance of San Diego County water treatment facilities. Equipment must also be periodically replaced and treatment processes may also be periodically upgraded.

From the treatment plant, water reaches its customers through a distribution system consisting of pipes, referred to as water mains, storage tanks, and pumping stations. Individual customers connect to water mains to bring public drinking water directly to their properties in San Diego County, California.

Water Testing in San Diego County

Water Companies typically have a laboratory or testing division responsible for monitoring the quality of tap water throughout the process, from source to distribution. California state regulations require Water Utilities to prepare and issue San Diego County water quality reports to the general public several times per year.