Corona, CA Environmental Rules: Erosion Control (2026)

060(A) makes an Erosion Control Plan mandatory for any work authorized by a grading permit unless the City Engineer waives it, and even then the Engineer can still order temporary or permanent erosion control devices installed for safety. No grading activity may occur between October 1 and May 31 unless an Erosion Control Plan is approved or waived, and single-family residential lot grading can skip the plan only if an approved erosion control system is installed, placed, planted or constructed before October 1. A plan approved in a prior year must be updated before the next October 1 if grading is continuing or covers new construction phases, and every plan must be certified and inspected by a civil engineer, with sediment control maintained continuously through construction.

280, a 24-hour emergency contact number, the preparing civil engineer's stamp and signature, identification of desilting and erosion-protection facilities, a schedule for building and maintaining those facilities, and identification of concentrated-runoff discharge points. 280's design standards, which cover on-site sediment containment, energy dissipaters at discharge points, desilting basin compaction (90% relative compaction) and mandatory slope planting for cut or fill slopes over three feet, with sprinkler systems required above 15 feet.