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Wells, Groundwater, and Water System Monitoring

Water Protection, Land Use & Onsite Systems

Services to help protect drinking water and environmental health through oversight, sampling, permitting and technical guidance. These services support safe water supplies, responsible groundwater use and early identification of potential contamination risks.

Groundwater Protection Program

Safeguarding underground water supplies and surface waters from chemical pollution through inspections, cleanup oversight and permitting for well installations and geotechnical drilling in San Mateo County.

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Small Drinking Water System Inspection Program

Find resources and guidance for managing small drinking water systems in San Mateo County. Learn about permits, inspections and compliance requirements.

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Alternative Water Program

Learn how to safely capture and use rainwater, graywater and other non-potable water sources for landscaping and other non-drinking purposes in San Mateo County.

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Beach & Creek Monitoring Program

Access weekly water quality testing results for 43 recreational sites in San Mateo County, including beaches and creek mouths. Find current advisories, sampling schedules and volunteer opportunities to help protect public health.

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Cross Connection Control Program (Backflow Prevention Programs)

Learn about backflow prevention requirements, certified testers and compliance for protecting San Mateo County's drinking water supply.

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Wells

Inspection staff regulate all domestic and agricultural water wells and springs.

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Commercial Laboratories Approved for Water Analysis

A list of approved suppliers for water analysis.

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