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  • Water Pollution Control Plant


1444 Borregas Avenue
Sunnyvale, CA 94089

Mailing Address:
P.O. Box 3707
Sunnyvale, CA 94088-3707

Phone: (408) 730-7260,
TDD (408) 730-7501

Fax: (408) 747-1139

Contact us

M-F,  7 a.m. - 4 p.m.


About the Water Pollution Control Plant

About the Plant

The Donald M. Somers Water Pollution Control Plant is an advanced wastewater treatment facility serving residents, businesses and industries in the city of Sunnyvale.

Wastewater draining from indoor sources in Sunnyvale flows through sewer pipes that direct the wastewater to the Water Pollution Control Plant for treatment before being discharged to the San Francisco Bay. If left untreated before discharge, residential, commercial and industrial wastewater would upset the delicate ecosystem of southern San Francisco Bay.

In addition to wastewater treatment, services include regulatory permitting and inspections of pretreatment facilities and storm water management for business and industry in Sunnyvale, information on water pollution prevention and environmental education services to schools and youth.

Funded by user fees, the mission of the Water Pollution Control Plant is to conduct a cost-effective wastewater management program that is environmentally sound and regulated to protect public health, safety, property, and the quality of the Bay.

Originally constructed in 1956, the plant utilizes primary, secondary and tertiary treatment processes to treat the wastewater. At almost sixty years old, the Plant is undergoing major construction and much needed upgrades, begun in fall 2014.

Plant History

Awards and Recognition

Wastewater Treatment Reuse

Regional Coordination

The City of Sunnyvale is within the Santa Clara Basin Watershed, which drains rainfall and other water runoff through creeks and rivers to the South San Francisco Bay. Sunnyvale and the other agencies in this watershed that have responsibility for water quality are pursuing a regional or "watershed approach" to addressing issues. This means bringing all interested stakeholders together to discuss problems within the natural geographic framework in which they occur (a watershed). It is hoped that by working cooperatively, the most effective and efficient solutions can be developed.

For a description of two of these regional, watershed-wide efforts, the following links are provided.

Santa Clara Basin Watershed Management Initiative (SCBWMI)

Santa Clara Valley Urban Runoff Pollution Prevention Program (SCVURPPP)


City of Sunnyvale

Normal City Hours of Operation are
8 a.m. until 5 p.m.

(408) 730-7500

  • Sunnyvale City Hall
  • 456 W. Olive Ave.
  • Sunnyvale, CA 94086
  • TDD (408) 730-7501
  • Map and Directions 
  • City of Sunnyvale Logo

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About the Web Site

The City of Sunnyvale Web Site
is maintained by the Sunnyvale Communications Office and
the Department of Information Technology.

Questions? Contact Us.

The Fine Print