Construction in unincorporated LA County must implement erosion control BMPs per NPDES stormwater permits. Projects over 1 acre require a SWPPP. The county's diverse terrain (mountains, hillsides, coastal bluffs) makes erosion control critical. Grading permits include erosion control requirements.
All construction projects in unincorporated LA County disturbing soil must implement erosion control Best Management Practices (BMPs) per Title 12 (Environmental Protection). Projects disturbing 1 acre or more require a Stormwater Pollution Prevention Plan (SWPPP) under the state Construction General Permit. BMPs include silt fences, fiber rolls, stabilized construction entrances, and erosion control blankets. Grading permits from Building & Safety include erosion control requirements. Work during the rainy season (October 1 - April 15) has heightened BMP requirements.
Failure to implement erosion controls violates the county's MS4 NPDES permit and Title 12. Administrative fines range from $100 for minor violations to $10,000 per day for discharges to waterways. The LA Regional Water Quality Control Board can also impose separate penalties up to $10,000 per day. Stop-work orders may be issued until adequate erosion controls are installed.
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See how Los Angeles County's erosion control rules stack up against other locations.
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