Enter any address in Bexar County, Texas to see its FEMA flood zone
Flash flooding from thunderstorms is the dominant flood character in Bexar County. Over the past 30 years, the NOAA Storm Events Database recorded 396 flash flood events, resulting in 46 fatalities. Recent examples include flash flooding events in May 2025, which were attributed to atmospheric conditions including upper-level shortwave troughs and cold fronts, leading to heavy rainfall, damaging winds, and large hail.
National Flood Insurance Program (NFIP) claims data indicates that properties in Zone X have experienced the most claims, with an average payout of $12,196 and an average water depth of 5.9 feet. Properties in Zone A also show a significant number of claims, with higher average payouts of $18,520, though shallower average water depths of 4.4 feet. Homeowners in Zone X_SHADED have seen the highest average payouts, reaching $22,938, with an average water depth of 1.7 feet. Residents in all flood zones, particularly those in Zone X and Zone A, should pay close attention to flood risk.
Summary generated from NOAA storm narratives and NFIP claim data for this county. Not predictive.
96 NOAA storm reports from this county describe what happened, in the words of the meteorologists who were there.
Bexar County, Texas has recorded 438 flood-related events since 1996 according to NOAA's Storm Events Database, including 396 flash floods and 41 river or area floods. The county has received 30 federal disaster declarations, 3 of which involved flooding or coastal storms. Enter any address above to check its FEMA flood zone designation.
FEMA Disaster Declarations (1988–2025)
Source: OpenFEMA Disaster Declarations Summaries.
| Declaration | Type | Date |
|---|---|---|
| Duke Fire | Fire | Mar 4, 2025 |
| Severe Winter Storm | Severe Ice Storm | Feb 11, 2021 |
| Severe Winter Storms | Severe Ice Storm | Feb 11, 2021 |
| Tropical Storms Marco And Laura | Hurricane | Aug 23, 2020 |
| Hurricane Hanna | Hurricane | Jul 25, 2020 |
| Covid-19 | Biological | Jan 20, 2020 |
| Covid-19 Pandemic | Biological | Jan 20, 2020 |
| Hurricane Harvey | Hurricane | Aug 23, 2017 |
| Pat Gross Fire | Fire | Sep 9, 2011 |
| Big Oak Fire | Fire | Sep 8, 2011 |
NOAA Storm Events Database (1996–2025)
Source: NOAA National Weather Service Storm Events Database.
| Type | Date | Damage |
|---|---|---|
| Flash Flood | Aug 31, 2025 | 0.00K (2 deaths) |
| Flash Flood | May 30, 2025 | 0.00K |
| Flash Flood | May 28, 2025 | 0.00K |
| Flash Flood | May 26, 2025 | 0.00K |
| Flash Flood | Jun 12, 2025 | 0.00K (1 deaths) |
| Flash Flood | Jun 12, 2025 | 23.00M (11 deaths) |
| Flash Flood | Jun 12, 2025 | 100.00K |
| Flash Flood | Jun 11, 2025 | 0.00K |
| Flash Flood | Aug 2, 2025 | 0.00K |
| Flash Flood | Jan 24, 2024 | 0.00K |
Flash Flood — Aug 31, 2025
A frontal boundary moved into a moist airmass and generated thunderstorms. Some of these storms produced heavy rain. Two to four inches of rain fell in the Salado Creek basin in northern San Antonio. This rainfall led to flash flooding.
Flash Flood — May 30, 2025
Thunderstorms formed along a slow-moving cold front in Central Texas and moved through South-Central Texas. The slow movement led to high rainfall rates and locally heavy rain which in turn led to flash flooding.
Flash Flood — May 28, 2025
An upper-level shortwave trough moved across a stationary front that was stretched across Central Texas. Some of these storms moved into South-Central Texas producing damaging wind gusts and large hail. There were also a few reports of heavy rain leading to flash flooding.
Flash Flood — May 26, 2025
An upper-level shortwave trough moved across a cold front over South-Central Texas and generated thunderstorms. The warm, moist airmass had steep mid-level lapse rates, and some of the storms produced large hail. There were also a few reports of damaging wind gusts and heavy rain that led to flash flooding.
Flash Flood — Jun 12, 2025
A mid-level shortwave trough moved over Texas and combined with an abnormally moist airmass to generate thunderstorms. These storms were very efficient rain producers dropping locally heavy rain that led to flash flooding. There were also a few severe thunderstorms.
Source: NOAA National Weather Service Storm Events Database.
Source: OpenFEMA NFIP Individual Claims (2.25M records analyzed).
FEMA assigns flood zone designations to areas in Bexar County, Texas:
AE High Risk — 1% annual chance of flooding. Insurance required.
VE Very High Risk — Coastal flooding with wave action.
X (Shaded) Moderate Risk — 500-year floodplain.
X Low Risk — Outside major floodplains.
Properties in Bexar County, Texas that are in FEMA-designated Special Flood Hazard Areas (zones A and V) with federally backed mortgages are required to carry flood insurance.
Even outside high-risk zones, flood insurance is recommended. From 2014 to 2024, nearly one-third of NFIP claims came from outside the high-risk Special Flood Hazard Area.
Visit FloodSmart.gov to find an agent and get a quote.