Environmental Rules in Simi Valley, CA (2026)
3 verified environmental rules for Simi Valley, California, sourced directly from the municipal code and official government pages.
Verified from official government sources
Stormwater Management
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 Stormwater Management Rules
Some RestrictionsFlood Zones
Portions of Simi Valley fall within FEMA-designated flood zones, primarily along the Arroyo Simi and its tributaries. Properties in Special Flood Hazard Areas must meet floodplain development standards and carry flood insurance if federally financed.
Simi Valley FEMA Flood Zone Regulations
Some RestrictionsFEMA Flood Map Service Center
The FEMA Flood Map Service Center (MSC) is the official public source for flood hazard information produced in support of the National Flood Insurance Program (NFIP). Use the MSC to find your official flood map, access a range of other flood hazard products, and take advantage of tools for better understanding flood risk. FEMA flood maps are continually updated through a variety of processes. E...
Grading & Drainage
Simi Valley requires grading permits for significant earth-moving activities and enforces drainage standards to prevent erosion, sedimentation, and impacts on neighboring properties. Hillside grading is subject to enhanced review.
Simi Valley Grading and Drainage Permits
Some RestrictionsLooking for Ventura County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Simi Valley city rules.
Environmental Rules in Ventura County →