Enter any address in Mason County, Texas to see its FEMA flood zone
Flash flooding from heavy rainfall events is the dominant flood character in Mason County. Between 1993 and 2023, NOAA data recorded 25 flash flood events, resulting in one fatality. A notable event on July 4, 2025, caused devastating and historic flash flooding in northern and northeast portions of the Northwest Hill Country, damaging numerous roads and houses. This event was attributed to abundant tropical moisture and slow-moving thunderstorms producing rainfall totals of 10 to 16 inches, with localized amounts near 25 inches.
While flash flooding is a concern, other flood types have also occurred, including 11 general flood events and one tropical depression event in the same period. National Flood Insurance Program (NFIP) claims data shows that while most claims come from Zone X (unshaded) and Zone A, one claim in an unknown zone resulted in a significant payout of $45,000 with an average water depth of 5.0 feet. Homeowners in areas designated as Zone A, as well as those in unshaded Zone X, should pay close attention to flood risk. Residents in areas with unknown flood zone designations should also be aware of potential risks.
Summary generated from NOAA storm narratives and NFIP claim data for this county. Not predictive.
9 NOAA storm reports from this county describe what happened, in the words of the meteorologists who were there.
Mason County, Texas has recorded 37 flood-related events since 1996 according to NOAA's Storm Events Database, including 25 flash floods and 11 river or area floods. The county has received 19 federal disaster declarations, 4 of which involved flooding or coastal storms. Enter any address above to check its FEMA flood zone designation.
FEMA Disaster Declarations (1989–2025)
Source: OpenFEMA Disaster Declarations Summaries.
| Declaration | Type | Date |
|---|---|---|
| Severe Storms, Straight-line Winds, And Flooding | Flood | Jul 2, 2025 |
| Severe Winter Storm | Severe Ice Storm | Feb 11, 2021 |
| Severe Winter Storms | Severe Ice Storm | Feb 11, 2021 |
| Covid-19 | Biological | Jan 20, 2020 |
| Covid-19 Pandemic | Biological | Jan 20, 2020 |
| Severe Storms And Flooding | Flood | Sep 10, 2018 |
| Wildfires | Fire | Apr 6, 2011 |
| Wildfires | Fire | Mar 14, 2008 |
| Severe Storms, Tornadoes, And Flooding | Severe Storm | Jun 16, 2007 |
| Extreme Wildfire Threat | Fire | Nov 27, 2005 |
NOAA Storm Events Database (1996–2025)
Source: NOAA National Weather Service Storm Events Database.
| Type | Date | Damage |
|---|---|---|
| Flash Flood | Jul 13, 2025 | 0.00K |
| Flash Flood | Jul 4, 2025 | 0.00K |
| Flood | Apr 22, 2023 | 0.00K |
| Flood | Jul 4, 2021 | 0.00K |
| Flood | Oct 17, 2018 | 8.50M |
| Flash Flood | Oct 16, 2018 | 0.00K |
| Flash Flood | Oct 15, 2018 | 0.00K |
| Flash Flood | Jun 9, 2017 | 0.00K |
| Flash Flood | May 31, 2016 | 0.00K |
| Flash Flood | May 24, 2010 | 0.00K |
Flash Flood — Jul 13, 2025
The combination of deep tropical moisture and a weak upper level area of low pressure produced heavy rainfall and flash flooding across portions of the Northwest Hill Country and Heartland.
Flash Flood — Jul 4, 2025
Devastating and historic flash flooding occurred in northern and northeast portions of the Northwest Hill Country on July 4th with damage to many roads and houses. The combination of abundant tropical moisture associated with the remnants of Tropical Storm Barry and a weak upper level storm system, led to very slow moving or stationary thunderstorms producing very heavy and efficient rainfall. ...
Flood — Apr 22, 2023
A cold front moving south into a warm, moist and very unstable airmass, resulted in scattered thunderstorms during the afternoon and evening across eastern portions of the Concho Valley, as well as portions of the Heartland and the Northwest Hill Country. A few of the storms were supercell thunderstorms, due to the strong vertical wind shear across the area, which produced very large hail and i...
Flood — Jul 4, 2021
The combination of a weak stationary front and abundant tropical moisture resulted in showers and thunderstorms that produced some localized flooding mainly in San Angelo and Abilene.
Flood — Oct 17, 2018
An upper level low pressure system remained park across Baja California through October 17. This feature interacted with plenty of moisture and resulted in periods of very heavy rain from October 15 through the 17. ||Widespread flooding developed across the area and many lakes and rivers rose above flood stage and resulted in widespread flooding. Millions of dollars of damage was done to roa...
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 Mason 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 Mason 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.