Stormwater Management: Altadena vs Glendale
How do stormwater management rules compare between Altadena, CA and Glendale, CA?
Altadena and Glendale have similar restriction levels.
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 →Glendale, CA
Los Angeles County
Glendale participates in the LA County MS4 NPDES permit program. Stormwater discharge to the municipal system must comply with the permit. Low Impact Development standards apply to new construction and redevelopment.
View full Glendale rules →Key Facts Comparison
| Fact | Altadena | Glendale |
|---|---|---|
| Authority | LA County Code Title 12 + State Water Board MS4 | - |
| Construction SWPPP | Required ≥1 acre disturbance | - |
| Illicit Discharge Hotline | (888) CLEAN-LA | - |
| NPDES | - | LA County MS4 permit |
| LID | - | Required for new development |
| Illicit Discharge | - | Prohibited |
| Construction | - | SWPPP required for 1+ acre |
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.
Glendale 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 Glendale public works.
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See how Altadena and Glendale compare on other ordinance categories.
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