Environmental Rules in Folsom, CA (2026)
4 verified environmental rules for Folsom, California, sourced directly from the municipal code and official government pages.
Verified from official government sources
Stormwater Management
Folsom operates a Municipal Separate Storm Sewer System (MS4) under NPDES permit CAS082597 jointly with Sacramento County. Discharging pollutants — soap, paint, oil, sediment — to storm drains is prohibited. New development must meet Low Impact Development standards.
Environmental: Stormwater
Heavy RestrictionsErosion Control
Folsom requires erosion and sediment control plans for grading projects. Projects disturbing 1 acre or more need state Construction General Permit coverage and a SWPPP. The rainy season (October 1 – April 30) triggers enhanced BMP requirements.
Environmental: Erosion Control
Heavy RestrictionsFlood Zones
Folsom has FEMA-designated flood zones along the American River, Willow Creek, Humbug Creek, and the Folsom Dam spillway inundation area. Folsom participates in the NFIP. New construction in Special Flood Hazard Areas must be elevated per FMC Title 16.
Environmental: Flood Zones
Heavy RestrictionsGrading & Drainage
Folsom grading permits are required for earthwork exceeding specific thresholds under FMC Title 14 and the California Building Code Appendix J. Drainage must not be diverted onto neighboring property. Hillside projects near the American River face additional scrutiny.
Environmental: Grading Drainage
Heavy RestrictionsLooking for Sacramento County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Folsom city rules.
Environmental Rules in Sacramento County →