Stormwater Management: Downey vs Long Beach
How do stormwater management rules compare between Downey, CA and Long Beach, CA?
Downey has fewer restrictions than Long Beach.
Downey, CA
Los Angeles County
Downey is subject to LA County MS4 NPDES permit requirements for stormwater management. New development and significant redevelopment must implement Best Management Practices (BMPs) for stormwater quality.
View full Downey rules →Long Beach, CA
Los Angeles County
Long Beach's stormwater program under LBMC Ch. 8.96 prohibits non-stormwater discharge. Low Impact Development (LID) is required for projects adding 500+ sq ft. NPDES compliance is mandatory for all construction and development.
View full Long Beach rules →Key Facts Comparison
| Fact | Downey | Long Beach |
|---|---|---|
| Permit | LA County MS4 NPDES | - |
| New Development | BMPs required | - |
| Reporting | Illicit discharge reporting to city | - |
| Enforcement | Public Works Department | - |
| LID Threshold | - | 500 sq ft or more |
| Code | - | LBMC Ch. 8.96, Ch. 18.74 |
| Non-Stormwater | - | Discharge prohibited |
| Federal Law | - | Clean Water Act NPDES |
Highlighted rows indicate differences between cities.
Downey FAQ
Do I need a stormwater plan for my project?
Generally required for new construction and major renovations that increase impervious surface area. Small residential projects may be exempt.
What is an illicit discharge?
Any non-stormwater substance entering the storm drain system, including paint, oil, chemicals, or sediment. Report violations to Downey public works.
Long Beach FAQ
Do I need a stormwater plan for my project?
Generally required for new construction and major renovations that increase impervious surface area. Small residential projects may be exempt.
What is an illicit discharge?
Any non-stormwater substance entering the storm drain system, including paint, oil, chemicals, or sediment. Report violations to Long Beach public works.
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