Stormwater Management: Costa Mesa vs Santa Ana

What can I not put into Costa Mesa storm drains?

It is illegal to discharge anything other than stormwater into the storm drain system. This includes wash water, pool water, paint, oil, pesticides, fertilizer runoff, and sediment. Storm drains in Costa Mesa flow untreated to local waterways and ultimately the Pacific Ocean.

Do I need a WQMP for my construction project in Costa Mesa?

Yes, new development and significant redevelopment projects must prepare a Water Quality Management Plan incorporating LID strategies and BMPs. Projects disturbing one or more acres also need a state Construction General Permit and SWPPP.

Who enforces stormwater rules in Costa Mesa?

Costa Mesa Public Works and Code Enforcement handle local stormwater compliance. The Santa Ana Regional Water Quality Control Board oversees the regional NPDES MS4 Permit. Contact Public Works at (714) 754-5343 for questions.

What stormwater rules apply to construction in Santa Ana?

All construction sites must implement Best Management Practices to prevent sediment and pollutants from entering the storm drain system. Larger projects require a SWPPP under the state Construction General Permit.

Does Santa Ana require post-construction stormwater controls?

Yes. New development and significant redevelopment must incorporate permanent stormwater treatment controls as required by the Orange County MS4 permit.