Stormwater Management: Altadena vs Long Beach
How do stormwater management rules compare between Altadena, CA and Long Beach, CA?
Altadena has fewer restrictions than Long Beach.
Altadena, CA
Los Angeles County
LA County operates under a regional MS4 permit issued by the LA Regional Water Quality Control Board. LA County Code Title 12 prohibits discharging non-stormwater (sediment, chemicals, paint, sewage, washwater) into storm drains.
View full Altadena 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 | Altadena | Long Beach |
|---|---|---|
| Authority | LA County Code Title 12 + State Water Board MS4 | - |
| Construction SWPPP | Required ≥1 acre disturbance | - |
| Illicit Discharge Hotline | (888) CLEAN-LA | - |
| 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.
Altadena FAQ
Can I hose my driveway into the gutter in Altadena?
Generally no — soapy or sediment-laden runoff into the storm drain violates the LA County NPDES MS4 permit and Title 12.
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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