Water Quality


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The Westborough Water District provides its customers with high quality drinking water that is safe to drink and meets standards set by the California Department of Health Services and the United States Environmental Protection Agency.

The Westborough Water District receives 100 percent of its water from the San Francisco Water Department.  The water comes from Hetch Hetchy in Yosemite National Park and local reservoirs.

The California Department of Health Services and the United States Environmental Protection Agency set standards for drinking water quality. 

The District collects samples throughout the system weekly to be analyzed for coliform bacteria, chlorine residual, pH, and turbidity.  Every three months the District collect samples to monitor for trihalomethanes, or THMs, compounds formed when the chlorine used for disinfection reacts with naturally occurring organic compounds found in water.  Water quality is monitored daily at the Harry Tracy treatment plant by the San Francisco Water Department.


        Click here for 2017 Water Quality Report



In compliance with the Urban Water Management Planning Act, the Westborough Water District (WWD.) has prepared its fourth Urban Water Management Plan (UWMP) under the terms of AB797 (1983) and subsequent amending legislation.

On June 9, 2016, this plan was presented at a Public Hearing and approved by the Westborough Water District's Board of Directors.  It supersedes the existing plan prepared in 2005, will be used by the District staff to guide the District's water conservation efforts through the year 2020.

Click here for 2015 Urban Water Management Report (UWMP)


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Last modified: 07/05/18.