Los Angeles vs Norwalk
How do stormwater management rules compare between Los Angeles, CA and Norwalk, CA?
Norwalk has fewer restrictions than Los Angeles.
Los Angeles, CA
Los Angeles County
LAMC 64.72 (LID Ordinance, Ord. 183833) requires new development to manage stormwater runoff on-site through infiltration, bioretention, or capture systems. Priority projects must meet MS4 permit standards using the Development BMP Handbook. Projects disturbing 1+ acres need a state SWPPP. Grading permits are conditioned on stormwater compliance and a recorded covenant.
View full Los Angeles rules →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 →Key Facts Comparison
| Fact | Los Angeles | Norwalk |
|---|---|---|
| Code Section | LAMC 64.72 (LID Ordinance) | - |
| Requirement | On-site stormwater management | - |
| Hierarchy | Infiltration > bioretention > treatment | - |
| 1+ Acre Sites | State SWPPP required | - |
| Covenant | Recorded BMP maintenance agreement | - |
| New Development | - | Stormwater plan required |
| Runoff Control | - | On-site retention |
| Maintenance | - | Owner responsibility |
| Topic | - | Stormwater |
Highlighted rows indicate differences between cities.
Los Angeles 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 Los Angeles public works.
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.
Compare other topics
See how Los Angeles and Norwalk compare on other ordinance categories.
Want to add a third city?
Use our full comparison tool to compare up to three cities.
Open Comparison Tool