Flood zones for vacant land in Altadena
Of the 5,337 vacant lots in Altadena, 0 (0%) are in a FEMA high-risk flood zone, where a home loan on a new building needs flood insurance. 5,198 (97%) are in zone X with minimal risk. 139 are zone D, where flood risk has not been studied.
Flood zones in Altadena
| FEMA zone | Vacant lots | Share |
|---|---|---|
| X | 5,198 | 97% |
| D | 139 | 3% |
What the letters mean: flood zones explained.
Lots in a high-risk flood zone in Altadena
Zones A, AE, AH, AO and VE, lowest assessed value first.
None in this city.
Lots outside the flood zone in Altadena
Zone X with minimal risk, lowest assessed value first (25 of 5,198).
Questions about land in Altadena
How much vacant land in Altadena is in a flood zone?
0 of 5,337 vacant lots in Altadena (0%) are in a FEMA high-risk flood zone (A, AE, AH, AO or VE). 5,198 are zone X with minimal risk. 139 are zone D, where flood risk has not been studied.
Do I need flood insurance for land in Altadena?
Not for an empty lot: flood insurance covers buildings. If you build in a high-risk zone and borrow from a federally regulated lender, flood insurance on the building is required. 0% of Altadena's vacant lots are in such a zone.
More for Altadena: all vacant land · fire hazard zones
Sources
Counts are LandGrab's analysis of 2026 public data for vacant parcels in Los Angeles County, updated 2026-10-19. Maps change; confirm a specific lot with the county before you buy.