Enter any address in Union County, Ohio to see its FEMA flood zone
Flash flooding from thunderstorms is the dominant flood character in Union County, OH. Over the past 30 years, NOAA Storm Events data recorded 44 flood events and 15 flash flood events. Recent examples include flash flooding on June 5, 2024, attributed to a cold front causing heavy rain, and widespread showers leading to flooding on July 6, 2022.
National Flood Insurance Program (NFIP) claims data shows that properties in Zone A experienced an average water depth of 2.7 feet, with an average payout of $8,724. Properties in Zone X had an average water depth of 0.3 feet and an average payout of $9,392. Homeowners in or near areas designated as Zone A, or those located near rivers and streams, should pay the most attention to flood risk.
Summary generated from NOAA storm narratives and NFIP claim data for this county. Not predictive.
1 NOAA storm reports from this county describe what happened, in the words of the meteorologists who were there.
Union County, Ohio has recorded 59 flood-related events since 1996 according to NOAA's Storm Events Database, including 15 flash floods and 44 river or area floods. The county has received 13 federal disaster declarations. Enter any address above to check its FEMA flood zone designation.
FEMA Disaster Declarations (1978–2024)
Source: OpenFEMA Disaster Declarations Summaries.
| Declaration | Type | Date |
|---|---|---|
| Tornadoes | Tornado | Mar 14, 2024 |
| Covid-19 | Biological | Jan 20, 2020 |
| Covid-19 Pandemic | Biological | Jan 20, 2020 |
| Severe Storms | Severe Storm | Jun 29, 2012 |
| 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 |
| Snow | Snowstorm | Dec 22, 2004 |
| Severe Storms And Flooding | Severe Storm | Aug 27, 2004 |
NOAA Storm Events Database (1996–2025)
Source: NOAA National Weather Service Storm Events Database.
| Type | Date | Damage |
|---|---|---|
| Flash Flood | Jun 5, 2024 | 0.00K |
| Flood | Jul 24, 2023 | 0.00K |
| Flood | Jul 17, 2022 | 0.00K |
| Flood | Jul 6, 2022 | 0.00K |
| Flood | Jun 10, 2021 | 0.00K |
| Flood | Mar 28, 2020 | 0.00K |
| Flood | Sep 7, 2020 | 0.00K |
| Flood | Jun 19, 2019 | 0.00K |
| Flood | Jun 18, 2019 | 0.00K |
| Flood | May 17, 2019 | 0.00K |
Flash Flood — Jun 5, 2024
A cold front moved through the Ohio Valley, causing showers and thunderstorms out ahead of it. Some of the storms produced heavy rain and flash flooding.
Flood — Jul 24, 2023
Scattered thunderstorms developed as a low pressure system moved through the Ohio Valley.
Flood — Jul 17, 2022
Showers with embedded thunderstorms developed ahead of a low pressure system moving through the Great Lakes region.
Flood — Jul 6, 2022
An upper level disturbance produced widespread showers and thunderstorms across central Ohio during the overnight hours.
Flood — Jun 10, 2021
Slow moving thunderstorms developed during the afternoon hours in a warm and humid airmass.
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 Union 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 Union 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.