Stormwater Management: Downey vs Santa Clarita
How do stormwater management rules compare between Downey, CA and Santa Clarita, CA?
Downey and Santa Clarita have similar restriction levels.
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 →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 | Downey | Santa Clarita |
|---|---|---|
| Permit | LA County MS4 NPDES | - |
| New Development | BMPs required | - |
| Reporting | Illicit discharge reporting to city | - |
| Enforcement | Public Works Department | - |
| MS4 Permit | - | LA County requirements apply |
| LID | - | Required for new development |
| Watershed | - | Santa Clara River |
| Illicit Discharge | - | Prohibited |
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.
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.
Compare other topics
See how Downey and Santa Clarita compare on other ordinance categories.
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