Flood Zones: Altadena vs Long Beach
How do flood zones rules compare between Altadena, CA and Long Beach, CA?
Altadena and Long Beach 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 →Long Beach, CA
Los Angeles County
Long Beach participates in NFIP. FEMA flood maps govern SFHAs. Structures in flood zones require elevation certificates for major work. Substantial improvement rule (50%) applies.
View full Long Beach rules →Key Facts Comparison
| Fact | Altadena | Long Beach |
|---|---|---|
| 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 | - | Long Beach participates |
| Elevation Certificate | - | Required for new or substantially improved structures in SFHA |
| 50% Rule | - | Substantial improvement triggers full compliance |
| Flood Insurance | - | Required with federally backed mortgages in SFHA |
| Contact | - | (562) 570-6784 |
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.
Long Beach FAQ
Is my property in a flood zone in Long Beach?
Long Beach participates in NFIP. FEMA flood maps govern SFHAs. Structures in flood zones require elevation certificates for major work. Substantial improvement rule (50%) applies.
Do I need flood insurance in Long Beach?
NFIP: Long Beach participates. Elevation Certificate: Required for new or substantially improved structures in SFHA. 50% Rule: Substantial improvement triggers full compliance. Flood Insurance: Required with federally backed mortgages in SFHA.
Compare other topics
See how Altadena and Long Beach compare on other ordinance categories.
Want to add a third city?
Use our full comparison tool to compare up to three cities.
Open Comparison Tool