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The Metropolitan Water District of Southern California
Diemer Treatment Plant
The Robert B. Diemer Treatment Plant is located on a hilltop in Yorba Linda. The plant distributes water via gravity-flow to areas of Los Angeles and Orange counties.


The Diemer plant treats water from both the Colorado River Aqueduct and the State Water Project. The facility has a treatment capacity of 520 million gallons a day.


The facility is also home to the 5.1 megawatt Yorba Linda Hydroelectric Power Plant, which generates power by taking advantage of the powerful force created as water rushes down the pipelines leading to Diemer. The power plant is one of 16 such facilities built by Metropolitan along its conveyance and distribution system. Energy from the Yorba Linda facility is used to supplement Metropolitan's overall energy needs.


The plant is named after Robert B. Diemer, who started at Metropolitan in 1929 and eventually rose to chief engineer and was general manager from 1952 to 1961.


The Robert B. Diemer
Treatment Plant

3972 Valley View Ave.
Yorba Linda, CA 92886

(714) 528-7231