Water Treatment PlantThe City of Escondido supplies water to approximately 150,000 residential, commercial, and agricultural customers. The Escondido-Vista Water Treatment Plant treats all raw water before it is delivered to customers. The Water Treatment Plant was constructed in 1976 and has a capacity of 75 million gallons a day.

The City has multiple sources for its raw water. Local water originates from the watershed and well fields located near Lake Henshaw. The water is transferred to Lake Wohlford via an open canal. Additional water is purchased from the Colorado River and from northern California via the State Water Project through the Metropolitan Water District and San Diego County Water Authority. The water is stored in Dixon Lake.

The treatment of water includes coagulation, sedimentation, filtration and disinfection to ensure destruction of pathogenic organisms. Water enters the plant through a 54-inch diameter pipe. Chemicals are then added to assist in the treatment process. After chemical treatment and removal of organic components and suspended materials, the water is filtered through beds of Anthracite coal and sand supported by graded rock. Crystal clear water results.

Bacteriological, physical, and chemical tests are performed on water samples from the source during treatment and from the distribution system to assure safe water to customers with no compromises to public health. Process variables of pH, turbidity, and chlorine residual are monitored continuously.

After treatment, water is distributed from the Escondido-Vista Water Treatment Plant to the Vista Irrigation District, parts of Rincon del Diablo MWD, and throughout Escondido through a system of pipelines and reservoirs.

The City of Escondido is a member of the American Water Works Association


Water Quality Reports are a snapshot of drinking water quality in Escondido during a given calendar year. These reports include details about where Escondido's water originates, what elements the raw water contains, how it is tested and disinfected by the Water Division, and how the treated water compares to standards set by regulatory agencies.