Grading & Drainage: Downey vs Los Angeles
How do grading & drainage rules compare between Downey, CA and Los Angeles, CA?
Downey and Los Angeles have similar restriction levels.
Downey, CA
Los Angeles County
Grading permits are required in Downey for significant earth-moving projects. The Engineering Division reviews drainage plans to ensure proper stormwater conveyance and prevent flooding of adjacent properties.
View full Downey rules →Los Angeles, CA
Los Angeles County
Grading permits are required from LADBS for earthwork exceeding certain thresholds. The city conditions grading permits on stormwater pollution control compliance per LAMC 91.106.4.1. Hillside areas have enhanced grading standards under the Baseline Hillside Ordinance. Drainage must not direct water onto neighboring properties. A geotechnical report is typically required for hillside grading.
View full Los Angeles rules →Key Facts Comparison
| Fact | Downey | Los Angeles |
|---|---|---|
| Permit | Required for grading work | LADBS grading permit required |
| Review | Engineering Division approval | - |
| Drainage | Must not impact neighbors | Must not direct water to neighbors |
| County | LA County standards apply | - |
| Stormwater | - | BMP compliance required (LAMC 91.106.4.1) |
| Hillside | - | Enhanced standards under BHO |
| Geotech Report | - | Typically required for hillside |
Highlighted rows indicate differences between cities.
Downey FAQ
Do I need a grading permit?
Generally required for earth-moving over 50 to 100 cubic yards or changes to existing drainage patterns. Small landscaping projects are usually exempt.
My neighbor changed their grading and water flows onto my property. What can I do?
Contact Downey code enforcement. Redirecting drainage onto neighboring properties violates most municipal codes. The neighbor may be required to restore proper drainage.
Los Angeles FAQ
Do I need a grading permit?
Generally required for earth-moving over 50 to 100 cubic yards or changes to existing drainage patterns. Small landscaping projects are usually exempt.
My neighbor changed their grading and water flows onto my property. What can I do?
Contact Los Angeles code enforcement. Redirecting drainage onto neighboring properties violates most municipal codes. The neighbor may be required to restore proper drainage.
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