Environmental Rules in San Mateo, CA (2026)
5 verified environmental rules for San Mateo, California, sourced directly from the municipal code and official government pages.
Verified from official government sources
Stormwater Management
San Mateo enforces stormwater regulations under its NPDES Municipal Permit (San Mateo Countywide Water Pollution Prevention Program). Development creating or replacing 5,000+ sq ft of impervious surface must implement permanent stormwater BMPs. Illegal discharge to the storm drain system is prohibited.
San Mateo Stormwater Management
Some RestrictionsErosion Control
San Mateo requires Erosion and Sediment Control Plans for all projects requiring a demolition, grading, or building permit that involve site disturbance. Projects disturbing one acre or more require a state Construction General Permit with SWPPP. The city's hillside areas require particular attention to erosion prevention.
San Mateo Erosion Control Requirements
Some RestrictionsCoastal Development
The City of San Mateo is located on the eastern (bay) side of the San Francisco Peninsula and is not within the California Coastal Zone. The California Coastal Commission has no jurisdiction in San Mateo, and no Coastal Development Permit is required for projects in the city.
San Mateo Coastal Development — Not Applicable
Few RestrictionsFlood Zones
Parts of San Mateo near the Bay shoreline and creek corridors (Coyote Creek, San Mateo Creek) are in FEMA flood zones. New construction in Special Flood Hazard Areas requires elevation and a floodplain development permit.
City of San Mateo Flood Zone Rules
Some RestrictionsGrading & Drainage
Grading and drainage in San Mateo are regulated under the city's building code (Title 23) and the NPDES Municipal Permit. Projects requiring grading permits must submit drainage plans. All projects creating or replacing 5,000+ square feet of impervious surface must meet stormwater treatment requirements.
San Mateo Grading & Drainage Regulations
Some RestrictionsLooking for San Mateo County county-wide rules?
County ordinances apply to unincorporated areas and may supplement San Mateo city rules.
Environmental Rules in San Mateo County →