Murrieta, CA Environmental Rules: Erosion Control (2026)

Grading in Murrieta is regulated under Title 15 of the Municipal Code, which adopts the California Building Code Appendix J (Grading) with local amendments. A grading permit is required for any earthwork moving more than 50 cubic yards of material or creating cuts or fills exceeding 5 feet in vertical height, and for virtually any hillside site (slopes 15 percent and greater). Applicants must submit an erosion and sediment control plan showing proposed BMPs including silt fencing, fiber rolls, gravel bag check dams, stabilized construction entrances, and hydroseed or straw mulch for exposed slopes. During the rainy season (October 1 to April 30), plans must meet enhanced BMPs and have a responsible person available to deploy materials before forecast storms of 50 percent or greater probability. The State Water Board's Construction General Permit (Order 2022-0057-DWQ) requires a SWPPP and Qualified SWPPP Practitioner for sites of one acre or more; smaller Murrieta hillside sites still must comply with county and city BMP requirements. Post-construction slope stabilization is typically required within 14 days of completing grading. Non-compliance can result in stop-work orders and fines up to 5,000 dollars per day per Water Code section 13385.