Stormwater Management: Pomona vs Santa Clarita
How do stormwater management rules compare between Pomona, CA and Santa Clarita, CA?
Pomona and Santa Clarita have similar restriction levels.
Pomona, CA
Los Angeles County
Pomona enforces stormwater management under the LA County MS4 permit and NPDES requirements. Construction projects must implement BMPs. The city participates in the San Gabriel River watershed programs.
View full Pomona 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 | Pomona | Santa Clarita |
|---|---|---|
| Permit | LA County MS4 / NPDES | - |
| BMPs | Required for construction projects | - |
| Watershed | San Gabriel River | Santa Clara River |
| Authority | LA Regional Water Quality Control Board | - |
| MS4 Permit | - | LA County requirements apply |
| LID | - | Required for new development |
| Illicit Discharge | - | Prohibited |
Highlighted rows indicate differences between cities.
Pomona 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 Pomona 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 Pomona and Santa Clarita compare on other ordinance categories.
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