Enter any address in Brown County, Ohio to see its FEMA flood zone
Flash flooding from thunderstorms is the most frequent type of flood event in Brown County, OH, with 58 recorded instances in the last 30 years. These events, often associated with low-pressure systems and cold fronts causing heavy rainfall, have resulted in fatalities. For example, multiple flash flood events occurred on July 25, 2025, following a system that produced showers and thunderstorms.
National Flood Insurance Program (NFIP) data indicates that properties in Zone A and Zone X_SHADED have experienced the highest average claim payouts and water depths. Zone A claims averaged $14,843 with 4.3 feet of water, while Zone X_SHADED claims averaged $15,053 with 9.1 feet of water. Homeowners in these zones, as well as those in Zone X, should be particularly aware of their flood risk.
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.
Brown County, Ohio has recorded 111 flood-related events since 1996 according to NOAA's Storm Events Database, including 58 flash floods and 53 river or area floods. The county has received 19 federal disaster declarations, 5 of which involved flooding or coastal storms. Enter any address above to check its FEMA flood zone designation.
FEMA Disaster Declarations (1968–2020)
Source: OpenFEMA Disaster Declarations Summaries.
| Declaration | Type | Date |
|---|---|---|
| Covid-19 | Biological | Jan 20, 2020 |
| Covid-19 Pandemic | Biological | Jan 20, 2020 |
| Severe Storms, Flooding, And Landslides | Flood | Feb 5, 2019 |
| Severe Storms, Landslides, And Mudslides | Flood | Feb 14, 2018 |
| Severe Storms | Severe Storm | Jun 29, 2012 |
| Severe Storms And Flooding | Severe Storm | Apr 4, 2011 |
| Severe Wind Storm Associated With Tropical Depression Ike | Severe Storm | Sep 14, 2008 |
| Record Snow And Near Record Snow | Snowstorm | Mar 7, 2008 |
| Hurricane Katrina Evacuation | Hurricane | Aug 29, 2005 |
| Severe Winter Storms, Flooding, And Mudslides | Severe Storm | Dec 22, 2004 |
NOAA Storm Events Database (1996–2025)
Source: NOAA National Weather Service Storm Events Database.
| Type | Date | Damage |
|---|---|---|
| Flash Flood | Apr 29, 2025 | 0.00K |
| Flash Flood | Jul 20, 2025 | 20.00K |
| Flood | Jul 20, 2025 | 5.00K |
| Flash Flood | Jul 20, 2025 | 15.00K |
| Flash Flood | Jul 20, 2025 | 0.00K |
| Flood | Apr 11, 2024 | 0.00K |
| Flood | Jul 27, 2023 | 0.00K |
| Flash Flood | Jul 18, 2023 | 5.00K |
| Flash Flood | Jul 18, 2023 | 50.00K |
| Flood | Jan 3, 2023 | 0.00K |
Flash Flood — Apr 29, 2025
Thunderstorms affected the region during the afternoon hours as a low pressure system moved east across the Ohio Valley.
Flash Flood — Jul 20, 2025
A low pressure system moving through the Great Lakes region trailed a cold front that sagged south through the Ohio Valley. Showers and thunderstorms developed ahead of this boundary, some of which produced damaging winds and heavy rainfall.
Flood — Jul 20, 2025
A low pressure system moving through the Great Lakes region trailed a cold front that sagged south through the Ohio Valley. Showers and thunderstorms developed ahead of this boundary, some of which produced damaging winds and heavy rainfall.
Flood — Apr 11, 2024
A low pressure system moving through the Ohio River Valley resulted in occasional showers and thunderstorms.
Flood — Jul 27, 2023
Scattered thunderstorms developed during the evening hours in a warm and humid airmass. The thunderstorms persisted into the overnight hours.
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 Brown County, Ohio:
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 Brown County, Ohio 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.