Corona, CA Environmental Rules: Stormwater Management (2026)

Chapter 13.32 of the Corona Municipal Code prohibits the discharge of any non-stormwater materials into the city's storm drain system, including the natural drainage channels feeding Temescal Wash and the Prado Basin. Prohibited discharges include sediment from construction sites, vehicle wash water, paint, oil, pesticides, pool water with chlorine, landscape runoff, and concrete washout. Construction sites disturbing one acre or more must obtain coverage under the State Construction General Permit (Order 2022-0057-DWQ) and prepare a Stormwater Pollution Prevention Plan (SWPPP). Smaller sites must implement Best Management Practices (BMPs) per the Riverside County Water Quality Management Plan (WQMP). New development and significant redevelopment projects must incorporate Low Impact Development (LID) features such as bioswales, permeable pavement, and infiltration basins to capture and treat the first flush. The city's Public Works Department conducts inspections and may issue notices of violation, stop-work orders, and administrative penalties up to $10,000 per day for ongoing violations. Residents should never dump anything down storm drains and should report illegal discharges to the city hotline.