Monterey One Water

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Monterey One Water[1], formerly known as the Move Monterey Regional Water Pollution Control Agency (MRWPCA), was established in November, 1972, as a joint effort between the Monterey, Pacific Grove, and Seaside Sanitation districts in order to meet increased water treatment standards set in place by the Federal Clean Water Act. Before the establishment of Monterey One Water, each individual community was responsible for the management of their wastewater, which was often discharged discharge directly into the Monterey Bay.

Early on in its development

Water Treatment Process

Projects and Facilities

Public Engagement


MRWPCA was established in 1979 to administer water rationing in response to severe drought conditions [2]. MRWPCA was formed under a Joint Powers Authority agreement between the City of Monterey, the City of Pacific Grove and the Seaside County Sanitation District as a peninsula-wide effort to resolve area’s water issues [3]. MRWPCA operates the Regional Treatment Plant, the Salinas River Diversion Facility, the Castroville Seawater Intrusion Project, sewage collection pipelines, and 25 wastewater pump stations [3].


  1. Monterey One Water Homepage
  3. 3.0 3.1



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