Simi Valley enforces stormwater management regulations under the Ventura County Municipal Separate Storm Sewer System (MS4) permit. Construction projects must implement best management practices to prevent pollutants from entering storm drains.
Simi Valley participates in the Ventura Countywide Stormwater Quality Management Program under the NPDES MS4 permit. Construction projects disturbing one acre or more require a State Water Resources Control Board Construction General Permit and must prepare a Stormwater Pollution Prevention Plan (SWPPP). Smaller projects must implement appropriate BMPs including silt fences, fiber rolls, stabilized construction entrances, and proper material storage. Post-construction, new development and significant redevelopment must incorporate Low Impact Development (LID) features such as bioretention, permeable pavement, or infiltration systems. It is illegal to discharge non-stormwater to the storm drain system. The city inspects construction sites and responds to illicit discharge complaints.
Stormwater violations carry fines starting at $1,000 per day under the Clean Water Act and California Water Code. The city may issue stop-work orders for construction sites without proper BMPs. Illicit discharges (paint, chemicals, wash water) to storm drains result in cleanup orders and penalties.
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