Temecula, CA Environmental Rules: Erosion Control (2026)

Temecula's hilly terrain and clay soils make erosion control critical. The City enforces erosion and sediment control under the Grading Ordinance (TMC Title 18) and CBC Appendix J. Any grading exceeding 50 cubic yards or disturbing 5,000+ square feet requires a grading permit with an approved Erosion Control Plan. Required BMPs include perimeter silt fences, fiber rolls (wattles) on slopes, stabilized construction entrances to prevent track-out, covered stockpiles, and concrete washout containment. Slopes steeper than 5:1 must be hydroseeded or covered with erosion control blankets within 14 days of completion. The rainy season (October 1 - April 30) requires a winterization plan submitted by September 15 for all active grading sites — this includes desilting basins, check dams in swales, and protected drain inlets. Track-out onto public streets must be cleaned daily. Hillside developments in southern Temecula (Crowne Hill, Redhawk, Wolf Creek) face additional slope stability and revegetation requirements. Violations result in stop-work orders, daily fines up to $1,000, and potential cleanup cost recovery. The City inspects all active grading sites monthly during rainy season.