Flood Zones: Altadena vs Glendale
How do flood zones rules compare between Altadena, CA and Glendale, CA?
Altadena has fewer restrictions than Glendale.
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 →Glendale, CA
Los Angeles County
Glendale participates in the NFIP and regulates development in FEMA-designated flood zones. Properties near the Verdugo Wash, Los Angeles River, and foothill areas may be in Special Flood Hazard Areas requiring flood insurance and elevated construction.
View full Glendale rules →Key Facts Comparison
| Fact | Altadena | Glendale |
|---|---|---|
| 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 | - |
| NFIP Participant | - | Yes |
| Major Flood Features | - | Verdugo Wash, LA River |
| Standard | - | Lowest floor at or above BFE |
| Insurance | - | Required in SFHAs with federal mortgage |
| Review | - | Engineering Division |
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.
Glendale FAQ
Is my Glendale property in a flood zone?
Check FEMA's Flood Map Service Center or contact Glendale's Engineering Division. Properties near the Verdugo Wash and LA River are most likely in flood zones.
Do I need flood insurance in Glendale?
If your property is in an SFHA with a federally-backed mortgage, flood insurance is required. It is recommended for all flood-prone properties.
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