Stormwater Management: Costa Mesa vs Newport Beach
How do stormwater management rules compare between Costa Mesa, CA and Newport Beach, CA?
Costa Mesa has fewer restrictions than Newport Beach.
Costa Mesa, CA
Orange County
Costa Mesa regulates stormwater runoff as a co-permittee under the Orange County NPDES MS4 Permit issued by the Santa Ana Regional Water Quality Control Board. New development and significant redevelopment must incorporate best management practices and Low Impact Development strategies to prevent polluted runoff from reaching storm drains and waterways.
View full Costa Mesa rules →Newport Beach, CA
Orange County
Newport Beach enforces strict stormwater management regulations to protect Newport Bay, the ocean, and coastal waterways. The city's NPDES permit requires construction sites, businesses, and property owners to implement best management practices preventing polluted runoff. New development and significant redevelopment must incorporate post-construction water quality features.
View full Newport Beach rules →Key Facts Comparison
| Fact | Costa Mesa | Newport Beach |
|---|---|---|
| Governing Code | CMMC Title 14 - Water Quality | - |
| Regional Permit | OC NPDES MS4 Permit | - |
| SWPPP Required | Sites disturbing 1+ acre | - |
| LID Required | New development/redevelopment | - |
| Public Works | (714) 754-5343 | - |
| WQMP Trigger | - | 500+ sq ft disturbance |
| Post-Construction | - | 2,500+ sq ft impervious surface |
| Discharge Fine | - | Starting at $500 per day |
| Code Section | - | NBMC Chapter 14.36 |
Highlighted rows indicate differences between cities.
Costa Mesa FAQ
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.
Newport Beach FAQ
What triggers stormwater requirements for my Newport Beach project?
Projects disturbing 500 or more square feet of land require a Water Quality Management Plan. Projects creating 2,500 or more square feet of impervious surface must include permanent water quality treatment features in the design.
Can I wash my car and let water flow to the street in Newport Beach?
Washing vehicles on the street where runoff enters storm drains is prohibited. Wash vehicles on permeable surfaces like lawns, use a commercial car wash, or ensure all wash water is captured and directed to the sanitary sewer.
Who enforces stormwater rules in Newport Beach?
The Public Works Department Water Quality division enforces stormwater regulations. Report illicit discharges or construction site runoff to (949) 644-3215 or the city's water quality hotline.
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