Stormwater Management: Pasadena vs Santa Clarita
How do stormwater management rules compare between Pasadena, CA and Santa Clarita, CA?
Santa Clarita has fewer restrictions than Pasadena.
Pasadena, CA
Los Angeles County
Pasadena's Stormwater Management and Discharge Control (PMC Chapter 8.70) prohibits illicit discharge to the municipal stormwater system. LID plans required for new development must retain the 85th percentile storm on-site. NPDES permit compliance mandatory.
View full Pasadena rules →Santa Clarita, CA
Los Angeles County
Santa Clarita enforces LA County MS4 stormwater permit requirements. New development must manage runoff with LID features. The Santa Clara River watershed is a key concern.
View full Santa Clarita rules →Key Facts Comparison
| Fact | Pasadena | Santa Clarita |
|---|---|---|
| Code Section | PMC Chapter 8.70 | - |
| LID | Retain 85th percentile storm | Required for new development |
| NPDES | LA County MS4 permit | - |
| Design Volume | 1.0-1.2 inches per hour | - |
| MS4 Permit | - | LA County requirements apply |
| Watershed | - | Santa Clara River |
| Illicit Discharge | - | Prohibited |
Highlighted rows indicate differences between cities.
Pasadena 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 Pasadena public works.
Santa Clarita 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 Santa Clarita public works.
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