Flood Zones: Altadena vs Torrance
How do flood zones rules compare between Altadena, CA and Torrance, CA?
Altadena and Torrance have similar restriction levels.
Altadena, CA
Los Angeles County
Most of Altadena is in FEMA Flood Zone X (minimal hazard), but the area along Eaton Wash, the Arroyo Seco tributaries, and post-Eaton Fire burn-scar areas have heightened flood and debris-flow risk. LA County Code Ch. 22.142 (Floodplain Management) applies in mapped Special Flood Hazard Areas.
View full Altadena rules →Torrance, CA
Los Angeles County
Torrance adopted FEMA flood zone designations from the Flood Insurance Study dated June 18, 1979, with subsequent amendments, codified in TMC Chapter 79 (Flood Hazard Insurance). FIRM and FBFM maps are on file at the Community Development Department. Properties in designated flood zones must carry flood insurance and meet construction standards.
View full Torrance rules →Key Facts Comparison
| Fact | Altadena | Torrance |
|---|---|---|
| Most of Altadena | Zone X (minimal hazard) | - |
| Eaton Wash Adjacent | Zone A / AE possible | - |
| Code Section | LA County Code Ch. 22.142 | - |
| BFE+1 Required | In SFHA | - |
| Post-Eaton Fire | Elevated debris-flow risk | - |
| FEMA Study | - | June 18, 1979 (amended) |
| Maps on File | - | Community Dev. Dept. |
| NFIP | - | City participates |
| Code | - | TMC Div. 7, Ch. 9 |
Highlighted rows indicate differences between cities.
Altadena FAQ
Is Altadena in a flood zone?
Most of Altadena is in FEMA Zone X (minimal hazard), but areas along Eaton Wash and the foothill channels can be in Zone A/AE. Check the FEMA Map Service Center for your specific parcel.
Did the Eaton Fire affect flood risk?
Yes — post-fire burn scar areas above Altadena have elevated debris-flow and flash-flood risk during winter storms. USGS and NWS issue post-fire debris-flow advisories.
Torrance FAQ
Is my Torrance property in a flood zone?
Check the FEMA Flood Insurance Rate Maps on file at the Community Development Department/Engineering Division at 3031 Torrance Blvd, or use FEMA's online flood map service.
Do I need flood insurance in Torrance?
If your property is in a Special Flood Hazard Area and you have a federally-backed mortgage, flood insurance is required through the National Flood Insurance Program.
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