1,950 flood insurance claims·$34.1M paid·4 federal flood & hurricane disasters
Share of the whole county outline, rivers and lakes included; parts FEMA hasn’t mapped count as zero.
Shaded areas are FEMA’s mapped flood hazard zones in and around Hamilton County, Ohio. Zoomed out they are simplified; at street level the map switches to FEMA’s exact layer. Tap anywhere to check that spot, or search an address above.
Flash flooding and river flooding driven by heavy seasonal storms dominate Hamilton County, Ohio, with the NOAA Storm Events Database recording 146 flash flood events resulting in 3 deaths and 111 general flood events over the last 30 years. Recent occurrences include heavy rainfall from showers and thunderstorms in May 2024 and scattered thunderstorms in August 2025.
Federal insurance data underscores that flood risks extend beyond high-risk areas. Properties in FEMA Zone A account for the heavy majority of historical claims, totaling 1,105 claims with an average payout of $32,034 and an average recorded water depth of 11 inches. However, properties outside primary floodplains also experience losses; Zone X properties recorded 218 claims with an average payout of $26,715 and an average recorded water depth of 12 inches. Zone UNKNOWN recorded 469 claims with an average payout of $3,930 and an average water depth of 2 inches, Zone X_UNSHADED recorded 107 claims averaging $14,829 with an average water depth of 3 inches, and Zone X_SHADED recorded 50 claims averaging $22,461 with an average water depth of 5 inches.
Homeowners, real estate agents, and journalists should pay the closest attention to properties located within Zone A and Zone X, where average flood depths reach 11 to 12 inches and claim payouts are highest.
Summary written from NOAA storm reports and NFIP claims for this county. Not a prediction.
12% of Hamilton County’s flood insurance claims were on properties rated outside FEMA’s high-risk zones.
1,263 NFIP claims with a recorded rated flood zone, 1978 to date. The zone is the one FEMA used to rate that policy, which may not match today’s map. Source: OpenFEMA NFIP claims.
In flood insurance claims here that reported a flood depth, the average was 8 inches.
Drawn to scale against an 80-inch door. Even a few inches soaks flooring, the bottom of the drywall and anything plugged in near the floor.
Average of the depths reported on claims (zero and implausible values left out); FEMA’s record doesn’t say exactly where each depth was measured. Source: OpenFEMA NFIP claims.
The worst year was 1997, with 238 claims and $6.9M paid, the year of Severe Storms and Flooding.
Bar height is scaled by square root so ordinary years stay visible next to the worst one. NFIP claims by year of loss. Source: OpenFEMA.
24 NOAA storm reports from Hamilton County describe what happened, in the words of the forecasters who covered it. Read the Ohio flood stories →
18 federal disaster declarations since 1968, 4 of them floods, coastal storms or hurricanes.
| Disaster | Began |
|---|---|
| Severe Storms, Landslides, And Mudslides | Feb 14, 2018 |
| Severe Storms | Jun 29, 2012 |
| Severe Storms And Flooding | Apr 4, 2011 |
| Severe Wind Storm Associated With Tropical Depression Ike | Sep 14, 2008 |
| Hurricane Katrina Evacuation | Aug 29, 2005 |
| Snow | Dec 22, 2004 |
| Severe Storms And Flooding | Aug 27, 2004 |
| Severe Storms And Flooding | Jul 17, 2001 |
Weather and water disasters only; most recent first. Source: OpenFEMA Disaster Declarations.
257 since 1996: 146 flash floods and 111 river or area floods.
| Event | Date | Damage |
|---|---|---|
| Flood | Aug 12, 2025 | — |
| Flood | Aug 12, 2025 | $2,000 |
| Flood | Aug 7, 2025 | — |
| Flood | Apr 11, 2024 | — |
| Flash Flood | May 8, 2024 | $10,000 |
| Flash Flood | May 7, 2024 | $10,000 |
| Flash Flood | May 7, 2024 | $5,000 |
| Flash Flood | May 7, 2024 | $500,000 |
— = no damage estimate in the record. Source: NOAA Storm Events Database.
Flood · Aug 12, 2025. Scattered thunderstorms developed during the evening hours ahead of a frontal boundary moving through the Ohio Valley.
Flood · Aug 7, 2025. Scattered thunderstorms produced locally heavy rainfall.
Flood · Apr 11, 2024. A low pressure system moving through the Ohio River Valley resulted in occasional showers and thunderstorms.
Flash Flood · May 8, 2024. Showers and thunderstorms developed during the late afternoon and evening hours ahead of a low pressure system moving through the Ohio Valley.
National Weather Service narratives, lightly trimmed. Source: NOAA Storm Events Database.
Every colour on the map above is a place on this drawing: where the ground sits relative to the flood FEMA plans for.
If a building in Hamilton County is in a high-risk zone (A or V) and its mortgage comes from a federally regulated or insured lender, or is federally backed, flood insurance is required.
Outside those zones it is optional, and often worth having: from 2014 to 2024 nearly one-third of NFIP claims came from outside the high-risk Special Flood Hazard Area. Since Risk Rating 2.0, NFIP premiums are set for each building, so the only reliable price is a quote: FloodSmart.gov or a local agent.