Stormwater Management: Norwalk vs Pomona
How do stormwater management rules compare between Norwalk, CA and Pomona, CA?
Norwalk and Pomona have similar restriction levels.
Norwalk, CA
Los Angeles County
Norwalk requires stormwater management for new development and significant property modifications. Runoff must be controlled on-site through retention, detention, or infiltration systems.
View full Norwalk rules →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 →Key Facts Comparison
| Fact | Norwalk | Pomona |
|---|---|---|
| New Development | Stormwater plan required | - |
| Runoff Control | On-site retention | - |
| Maintenance | Owner responsibility | - |
| Topic | Stormwater | - |
| Permit | - | LA County MS4 / NPDES |
| BMPs | - | Required for construction projects |
| Watershed | - | San Gabriel River |
| Authority | - | LA Regional Water Quality Control Board |
Highlighted rows indicate differences between cities.
Norwalk 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 Norwalk public works.
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.
Compare other topics
See how Norwalk and Pomona compare on other ordinance categories.
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