Simi Valley, CA Environmental Rules: Erosion Control (2026)

501, any Responsible Party engaged in Construction Activities that require a grading permit must submit an approved SWPPP if the State requires one, or otherwise a City Stormwater Pollution Control Plan (SWPCP) that identifies potential pollutant sources and describes the design, placement and implementation of Best Management Practices to prevent non-stormwater discharges and reduce pollutants to the Maximum Extent Practicable. For Construction Activities on sites one acre or greater, the Responsible Party must submit a Local SWPPP with site-specific construction BMPs tied to specific locations and maintenance schedules, plus a signed statement from the project architect or engineer of record confirming the selected BMPs and a certification from the owner.

508 separately requires anyone applying for a State Construction General Permit to give the City's Director proof a Notice of Intent was filed with the State Water Resources Control Board and certification that a SWPPP was prepared, and bars issuance of any grading, encroachment, building, electrical, construction or demolition permit involving land disturbance until that proof is submitted. 110) layers on additional grading controls: a preliminary grading plan must include a soil stabilization report and erosion control measures to prevent soil loss while grading is in progress, and manufactured slopes cannot exceed 30 feet in height or a steepness of two horizontal to one vertical. The Director of Public Works oversees compliance under both chapters.