Redwood City vs San Mateo
How do erosion control rules compare between Redwood City, CA and San Mateo, CA?
Redwood City, CA
San Mateo County
No data available yet for Redwood City.
San Mateo, CA
San Mateo County
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.
View full San Mateo rules →Key Facts Comparison
| Fact | Redwood City | San Mateo |
|---|---|---|
| Required | - | All construction with site disturbance |
| SWPPP Threshold | - | 1+ acres of disturbance |
| Rainy Season | - | October through April — high risk |
| Hillside Areas | - | Elevated erosion concern |
| Public Works | - | 650-522-7300 |
Highlighted rows indicate differences between cities.
Redwood City FAQ
No FAQs available.
San Mateo FAQ
Do I need an erosion control plan in San Mateo?
Yes. All projects with site disturbance requiring a demolition, grading, or building permit must submit an Erosion and Sediment Control Plan.
When is erosion risk highest in San Mateo?
The rainy season from October through April presents the highest erosion risk, especially on the western hillside areas.
What happens if sediment enters the storm drain?
Sediment discharge to storm drains is a violation of the city's NPDES permit and the federal Clean Water Act. State fines can reach $10,000 per day.
Compare other topics
See how Redwood City and San Mateo compare on other ordinance categories.
Want to add a third city?
Use our full comparison tool to compare up to three cities.
Open Comparison Tool