The 4 wastewater treatment facilities collectively serve approximately 1,901,352 people, representing 98% of Santa Clara County’s total population.
Wastewater samples are collected at the following wastewater treatment plants:
||Wastewater treatment facility
||Approximate number of people in Santa Clara County served
||San Jose-Santa Clara Regional Wastewater Facility
||Palo Alto Regional Water Quality Control Plant
||Donald M. Somers Water Pollution Control Plant
||South County Regional Wastewater Authority
Source: U.S. Census Bureau, 2020 American Community Survey block data
San Jose-Santa Clara Regional Wastewater Facility serves people in the cities of San Jose, Santa Clara and Milpitas; Cupertino Sanitary District (City of Cupertino and nearby unincorporated areas); West Valley Sanitation District (Cities of Campbell, Los Gatos, Monte Sereno, and Saratoga); County Sanitation District No. 2-3 (unincorporated area); and Burbank Sanitary District (unincorporated area).
Palo Alto Regional Water Quality Control Plant serves people in Los Altos, Los Altos Hills, Mountain View, Palo Alto, Stanford University, and the East Palo Alto Sanitary District. Note: A portion of wastewater received at the Palo Alto Regional Water Quality Control Plant comes from San Mateo County.
Donald M. Somers Water Pollution Control Plant serves people in the city of Sunnyvale; Rancho Rinconada portion of Cupertino; and Moffett Federal Airfield.
South County Regional Wastewater Authority serves people in the cities of Gilroy and Morgan Hill.