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The Metropolitan Water District of Southern California
Weymouth Treatment Plant

The F.E. Weymouth Treatment Plant in the city of La Verne is the first treatment plant built by Metropolitan. It largely serves Los Angeles and Orange counties. Completed in 1940, it is noted for its Mission Revival-style architecture.


The plant was part of the district's Colorado River Aqueduct construction project. Today, it treats water from the Colorado River and the State Water Project, which imports supplies from Northern California. Weymouth has a treatment capacity of 520 million gallons a day, the equivalent of filling the Rose Bowl every four hours.


Weymouth is also the location of Metropolitan's state-of-the-art water quality lab where more than 250,000 water quality tests are conducted each year. The laboratory's primary purpose is to safeguard the drinking water served to nearly 19 million Southern California residents.


The plant is named for Frank E. Weymouth, Metropolitan's first chief engineer and general manager from 1929 to 1941. He supervised construction of the Colorado River Aqueduct and died just weeks after its completion.


F.E. Weymouth
Treatment Plant

700 Moreno Avenue
La Verne, CA 91750

(909) 392-5000