San Antonio, TX Flood Zone Map
FEMA flood zone data for San Antonio. The map below shows high-risk areas (FEMA Special Flood Hazard Areas) over local waterways and streets -- computed from the official FEMA National Flood Hazard Layer.
- High risk
- Moderate
- Lower risk
- Not mapped
Flood Zone Breakdown for San Antonio
About 21% of the mapped area in San Antonio falls within a FEMA Special Flood Hazard Area (high-risk or moderate-risk flood zone). The breakdown by zone:
- AE 11% Zone AE
- A 10% Zone A
- X 78% Zone X
Where Flooding Comes From in San Antonio
Flash flooding (San Antonio River and tributaries, Salado Creek).
- Indian Crk
- Salado Crk
- Rosillo Crk
- Comanche Crk
- San Pedro Crk
- San Antonio Riv
- Pershing Crk
- Leon Crk
Flood Zone Details for San Antonio
| Zone | Risk level | Area | Insurance |
|---|---|---|---|
| AE | High-risk riverine or coastal flood zone with a computed base flood elevation (BFE). About a 1-in-100 chance of flooding each year. | 11% | Flood insurance is typically required for federally backed mortgages. |
| A | High-risk flood zone without a detailed BFE study. About a 1-in-100 chance of flooding each year. | 10% | Flood insurance is typically required for federally backed mortgages. |
| X | Lower-risk zone outside the 1% annual chance flood boundary. Flooding is still possible but less likely than in high-risk zones. | 78% | Flood insurance is not required but may still be a smart choice -- about 25% of flood claims come from lower-risk areas. |
Learn More About the Zones in San Antonio
Check YOUR Exact Address in San Antonio
The map above shows the broad flood zone picture for San Antonio. Your specific property may be in a different zone -- the only way to know for certain is to check your exact address.