Flood Zones: Downey vs Los Angeles
How do flood zones rules compare between Downey, CA and Los Angeles, CA?
Downey has fewer restrictions than Los Angeles.
Downey, CA
Los Angeles County
Portions of Downey fall within FEMA-designated flood zones, primarily along the Los Angeles River and Rio Hondo channels. The city participates in the National Flood Insurance Program and enforces floodplain development standards.
View full Downey rules →Los Angeles, CA
Los Angeles County
The Specific Plan for Management of Flood Hazards (Ordinance 172,081) is the primary regulation governing development in LA flood zones. The Los Angeles Flood Hazard Map (LAFHM) designates floodways, floodplains, mud-prone areas, and coastal high-hazard zones. LAMC 19.07 establishes fees for flood hazard compliance checks by the Bureau of Engineering.
View full Los Angeles rules →Key Facts Comparison
| Fact | Downey | Los Angeles |
|---|---|---|
| NFIP Participant | Yes | - |
| Flood Areas | LA River, Rio Hondo corridors | - |
| Building Code | CA Building Code floodplain provisions | - |
| Flood Maps | FEMA Flood Map Service Center | - |
| Public Works | (562) 904-7110 | - |
| Primary Law | - | Ordinance 172,081 (Specific Plan) |
| Compliance Fee | - | $273 per check (LAMC 19.07) |
| Flood Map | - | LA Flood Hazard Map (LAFHM) |
| NFIP | - | City participates in federal flood insurance |
| Zone Types | - | Floodway, floodplain, mud-prone, coastal |
Highlighted rows indicate differences between cities.
Downey FAQ
Is my Downey property in a flood zone?
Check FEMA's Flood Map Service Center at msc.fema.gov for your property's flood zone designation. Properties near the LA River or Rio Hondo may be in Special Flood Hazard Areas.
Do I need flood insurance in Downey?
Properties in FEMA-designated Special Flood Hazard Areas with federally backed mortgages are required to carry flood insurance.
Los Angeles FAQ
How do I check if my LA property is in a flood zone?
Check the Los Angeles Flood Hazard Map (LAFHM) through the Bureau of Engineering's website or request a flood hazard report. The Bureau charges $273 for a formal compliance check under LAMC 19.07. FEMA flood maps are also available through the NFIP.
Do I need special permits to build in an LA flood zone?
Yes. Development in any designated flood hazard area requires flood clearance from the Bureau of Engineering under Ordinance 172,081. You may need elevation certificates, floodproofing certificates, and compliance with both the city Specific Plan and NFIP requirements.
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