Stormwater Management: Los Angeles vs Pasadena
How do stormwater management rules compare between Los Angeles, CA and Pasadena, CA?
Los Angeles and Pasadena have similar restriction levels.
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 →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 →Key Facts Comparison
| Fact | Los Angeles | Pasadena |
|---|---|---|
| Code Section | LAMC 64.72 (LID Ordinance) | PMC Chapter 8.70 |
| Requirement | On-site stormwater management | - |
| Hierarchy | Infiltration > bioretention > treatment | - |
| 1+ Acre Sites | State SWPPP required | - |
| Covenant | Recorded BMP maintenance agreement | - |
| LID | - | Retain 85th percentile storm |
| NPDES | - | LA County MS4 permit |
| Design Volume | - | 1.0-1.2 inches per hour |
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.
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.
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