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.
The City of San Mateo regulates grading through the building code (Title 23) and manages drainage under its NPDES Municipal Permit obligations. A grading permit is required for earthwork exceeding specified thresholds. All projects requiring a demolition, grading, or building permit that involve site disturbance must submit an Erosion and Sediment Control Plan. Projects creating or replacing 5,000 or more square feet of impervious surface must meet stormwater treatment requirements. The city's hilly terrain on the western slopes and flat baylands on the east create distinct drainage challenges. Development must not increase stormwater runoff to downstream properties. The Public Works Department reviews grading and drainage plans at 650-522-7300.
Grading without a permit is a building code violation subject to stop-work orders and fines. Drainage alterations causing damage to downstream properties may result in civil liability and enforcement.
San Mateo, CA
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