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Groundwater Management Program


San Francisco's Groundwater Basins

Our groundwater management program ensures that local groundwater resources designated for current or future beneficial use are properly protected to prevent overdraft and contamination. There are 7 small groundwater basins in San Francisco.

Groundwater Monitoring and Data Management

The Westside Basin Groundwater Monitoring Program provides information summarizing basin-wide groundwater pumping, groundwater levels and quality in the different aquifers of the basin, and surface water conditions, most notably in Lake Merced. The program also monitors physical and chemical changes in the groundwater system may result from current pumping at the San Francisco Zoo and Golden Gate Park, the San Francisco Groundwater Supply Project wells soon to be operable in northern San Mateo County.

The current Annual Groundwater Monitoring Report, Westside Basin is available here.

If you have questions, please email


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Last updated: 11/20/2020 2:07:48 PM