Seneca County, Ohio Natural Disaster Risk
FEMA National Risk Index assessment · OH
LowComposite Risk Score
National percentile: 47th
Seneca County faces low composite natural disaster risk (NRI Risk Index score 46.9, 47th national percentile), driven primarily by hail and ice storm exposure. Expected annual loss across all 18 hazard types is $16M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Risk Overview
Seneca County carries a low composite natural disaster risk, with a National Risk Index score of 46.9 out of 100 — placing it in the 47th national percentile and below the national average for natural-disaster risk. The score blends Expected Annual Loss, Social Vulnerability, and Community Resilience across all 18 FEMA hazard types.
Most of Seneca County's expected losses come from hail (ice stones from severe thunderstorms that damage property and crops) at Medium risk — $898K in expected annual loss and about 3.40 events per year; ice storm (freezing rain that coats surfaces in heavy, damaging ice) at Medium risk — $318K in expected annual loss and about 0.90 events per year; and winter weather (heavy snow, blizzards, and hazardous winter conditions) at Medium risk — $154K in expected annual loss and about 9.05 events per year. Across all hazards, FEMA estimates $16M in expected annual loss for a population of 55K.
Beyond physical exposure, Seneca County has a low social vulnerability rating (how susceptible the population is to harm) and a very high community resilience rating (its capacity to prepare for and recover from disasters). A less vulnerable population paired with strong resilience helps the community absorb and recover from events.
The federal record bears this out: Seneca County has received 13 federal disaster declarations since 1965, including 5 for severe storm events and 3 for snowstorm events. The most recent was Covid-19 Pandemic (biological), declared in March 2020.
Among 88 Ohio counties, Seneca County ranks #56 for overall natural disaster risk.
Top Hazards
All 18 Hazard Risks
| Hail | Medium | 3.40 / yr | $898K |
| Ice Storm | Medium | 0.90 / yr | $318K |
| Winter Weather | Medium | 9.05 / yr | $154K |
| Riverine Flood | Low | 1.00 / yr | $10M |
| Tornado | Low | 0.28 / yr | $2M |
| Earthquake | Very Low | 0.00 / yr | $431K |
| Strong Wind | Medium | 2.65 / yr | $687K |
| Lightning | Low | 40.16 / yr | $293K |
| Cold Wave | Low | 4.32 / yr | $1M |
| Hurricane | Very Low | 0.02 / yr | $46K |
| Landslide | Very Low | 0.09 / yr | $615 |
| Heat Wave | Very Low | 3.11 / yr | $188K |
| Wildfire | Very Low | 0.00 / yr | $1K |
| Avalanche | Very Low | 0.00 / yr | $0 |
| Coastal Flood | Very Low | 0.00 / yr | $0 |
| Drought | Very Low | 0.00 / yr | $0 |
| Tsunami | Very Low | 0.00 / yr | $0 |
| Volcanic Activity | Very Low | 0.00 / yr | $0 |
Disaster History
Seneca County has received 13 federal disaster declarations since 1965, most recently Covid-19 Pandemic in March 2020. Most frequent causes: Severe Storm (5), Snowstorm (3), Biological (2).
| Declared | Type | Disaster |
|---|---|---|
| March 2020 | Biological | Covid-19 Pandemic |
| March 2020 | Biological | Covid-19 |
| June 2012 | Severe Storm | Severe Storms |
| August 2007 | Severe Storm | Severe Storms, Flooding, and Tornadoes |
| September 2005 | Hurricane | Hurricane Katrina Evacuation |
| February 2005 | Severe Storm | Severe Winter Storms, Flooding, and Mudslides |
| January 2005 | Snowstorm | Snow |
| September 2004 | Severe Storm | Severe Storms and Flooding |
| November 2002 | Severe Storm | Severe Storms and Tornadoes |
| January 1978 | Snowstorm | Blizzards & Snowstorms |
Showing the 10 most recent of 13 declarations.
Source: FEMA Disaster Declarations Summaries (OpenFEMA).
Frequently Asked Questions
What is the overall natural disaster risk for Seneca County?
Seneca County has a composite FEMA National Risk Index score of 46.9 out of 100, placing it in the Low category and the 47th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Seneca County?
The three highest-rated hazards are Hail (Medium, $898K EAL), Ice Storm (Medium, $318K EAL), Winter Weather (Medium, $154K EAL). These account for most of the county's expected annual losses.
How does Seneca County compare to other Ohio counties?
Seneca County ranks #56 of 88 Ohio counties for overall natural disaster risk, with a low rating.
How many federally declared disasters has Seneca County had?
FEMA records 13 federal disaster declarations for Seneca County since 1965, most often 5 for severe storm events and 3 for snowstorm events. The most recent was Covid-19 Pandemic, declared in March 2020.
What does Expected Annual Loss (EAL) mean?
EAL is FEMA's estimate of average annual dollar losses from natural hazards, calculated from historical event data and exposure models. Seneca County's $16M EAL is a statistical average, not a guarantee for any specific year or address.