Water Sources

District No. 21 serves approximately 240 customers, and receives its water through an interagency agreement with the Cities of Glendale and Los Angeles. The City of Glendale provides groundwater to the City of Los Angeles in exchange for the City of Los Angeles providing District No. 21 with a connection to their water system which is located at the south end of the District. The City of Los Angeles’ water is a mixture of groundwater pumped from the local area, treated State Water Project water, and water that is imported by the City of Los Angeles from the Owens Valley.

The largest district, District No. 40 serves approximately 57,000 customers with water that is imported to the Antelope Valley through the State Water Project and then treated at AVEK’s Quartz Hill Water Treatment Plant and Eastside Water Treatment Plant. This supply is supplemented by groundwater pumped from the Antelope Valley Groundwater Basin by approximately 50 wells owned and operated by the District

In an effort to ensure supply reliability, District No. 40 is undertaking projects to store excess imported water in the ground during wet years so that it can be extracted and used during dry years. District No. 40 has designed many of its groundwater wells so that excess treated imported water in the District’s distribution system can be injected through the wells and stored until a future time when it is needed. This program is called aquifer storage and recovery (ASR). District No. 40 is also working with AVEK to utilize large undeveloped areas in the Antelope Valley to deliver imported water and allow it to infiltrate into the ground where it will be stored. Subsequently, new wells will extract this water at a later time when it is needed.

District No. 40 also has an agreement with the Los Angeles County Sanitation Districts to use over 13,000 acre-feet of highly treated wastewater produced at their Palmdale and Lancaster Water Reclamation Plants on the North Los Angeles County Regional Recycled Water Project. This “recycled water” will be made available through construction of a completely separate water distribution system for irrigation and other applications that do not require the water to be drinkable. This project will decrease the region’s reliance on imported water and local groundwater supplies.

District No. 36 is served with imported State Water Project water that is treated at Santa Clarita Valley Water Agency's Earl Schmidt Filtration Plant and Rio Vista Water Treatment Plant. The District also utilizes groundwater from the Saugus formation beneath the District service area. In general, the supply in the District is made up of 50% imported water and 50% groundwater. District No. 36 serves approximately 1,300 customers.

The water supply for District No. 37 is primarily groundwater pumped from 3 wells owned and operated by the District. The groundwater is supplemented by imported water from the State Water Project which is treated at AVEK’s Acton Water Treatment Plant. District No. 37 serves approximately 1,400 customers.

District No. 29 serves over 7000 customers using imported water from the State Water Project and the Colorado River Aqueduct. The water is initially treated to drinking water standards at one of Metropolitan Water Districts’ water treatment plants. District No. 29 receives the water through a contract with the West Basin Municipal Water District, a member agency of the Metropolitan Water District. The District’s connection to Metropolitan Water District’s system is located in Culver City. The water travels to the District through a 35-mile transmission main in Pacific Coast Highway.