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Water Protection and Land Use

Environmental Health Services

San Mateo County Environmental Health Services is responsible for regulating activities that protect public health and the environment through the safe management of water resources and land use. This includes oversight of septic systems, water wells, cross-connection control, groundwater protection, and small public drinking water systems. The programs below ensure compliance with local and state regulations, support sustainable development, and help safeguard the County’s water quality for current and future generations.

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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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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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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Land Use, Septic & Wells

Guidance on permitting and inspection for septic systems, water wells and land use in unincorporated areas of San Mateo County.

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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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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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Water Protection and Land Use Updates

8/27 Beach and Creek Updates

The following locations have elevated levels of indicator bacteria and are posted with warning and/or closure signs. Ocean Beaches Rockaway Beach Linda Mar #5 (Linda Mar Blvd.) Fitzgerald Marine Reserve […]