Menifee, CA Environmental Rules: Erosion Control (2026)

060 requires an approved erosion control plan for essentially all work covered by a grading permit or grading plan; no grading may proceed until the plan is approved or the requirement is waived. 270, a 24-hour emergency contact, the civil engineer's stamp, desilting facility locations, and a schedule for building and maintaining erosion controls. Plans from a prior year must be updated before each rainy season, and updates can also be ordered mid-construction if conditions change or a new phase starts. 270 sets the technical standards: all sediment must be contained on-site using berms, swales, ditches, or filter strips, installed before or with the initial grading and maintained throughout construction.

Slopes over three feet need effective stabilization, slopes over 15 feet may need a sprinkler system, and any slope over five feet must be permanently landscaped or otherwise stabilized with approved BMPs. Disturbed slopes must be planted or otherwise protected within seven days of finishing each grading stage, and graded perimeter areas must drain away from slope faces at the end of every working day. Work near an environmentally sensitive area can trigger extra controls, including a 24-hour on-site guard when there is a 50% or greater chance of more than a half inch of rain in 24 hours, per National Weather Service forecasts.

Off-site erosion control work requires written permission from the affected property owner and must be included in the plan submitted to the City Engineer/Public Works Director. Desilting basins built from compacted earth must reach 90% relative compaction, verified by a soil engineering report submitted for city approval.