Erosion Control: Castro Valley vs San Leandro
How do erosion control rules compare between Castro Valley, CA and San Leandro, CA?
San Leandro has fewer restrictions than Castro Valley.
Castro Valley, CA
Alameda County
Alameda County requires erosion control during the rainy season (October 1 to April 30). Projects over 1 acre need a Construction General Permit and a SWPPP.
View full Castro Valley rules →San Leandro, CA
Alameda County
San Leandro requires erosion and sediment control plans for grading over 50 cubic yards or 1 acre. BMPs per CA Stormwater Quality Association manual.
View full San Leandro rules →Key Facts Comparison
| Fact | Castro Valley | San Leandro |
|---|---|---|
| Wet season | October 1 to April 30 | Oct 1 - Apr 30 |
| Permit trigger | 1 acre disturbance | - |
| Plan required | SWPPP with QSD | - |
| Required BMPs | Silt fences, wattles, inlets | - |
| Penalty | Up to 10,000 per day | - |
| Local threshold | - | 50 cu yd or 1 acre |
| State permit | - | 1 acre+ CGP |
| SWPPP | - | Required 1 acre+ |
| Code | - | CBC Appendix J |
Highlighted rows indicate differences between cities.
Castro Valley FAQ
Do I need a SWPPP for a small home project?
Only if you disturb 1 acre or more, which is unusual for single-family projects. Smaller projects still need basic erosion control BMPs during the wet season.
What BMPs work best on my hillside lot?
Combine silt fences or fiber rolls at the downslope perimeter, straw wattles along contours, and rapid revegetation or hydroseeding of disturbed areas before October 1.
San Leandro FAQ
Does landscape work need an erosion plan?
Only if grading exceeds 50 cubic yards. Most homeowner landscaping is below threshold.
When is wet season enforcement?
October 1 through April 30, when projects must have BMPs in place daily.
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