Washington County
Ohio — Natural Disaster Risk Assessment
LowComposite Risk Score
National percentile: 64th
Washington County faces low composite natural disaster risk (NRI Risk Index score 64.4, 64th national percentile), driven primarily by landslide and riverine flood exposure. Expected annual loss across all 18 hazard types is $22M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Top Hazards
All 18 Hazard Risks
| Landslide | Medium | 1.49 / yr | $43K |
| Riverine Flood | Medium | 4.04 / yr | $19M |
| Ice Storm | Medium | 0.54 / yr | $238K |
| Heat Wave | Low | 3.05 / yr | $660K |
| Lightning | Medium | 46.34 / yr | $361K |
| Drought | Low | 4.03 / yr | $293K |
| Hurricane | Very Low | 0.02 / yr | $142K |
| Hail | Low | 2.59 / yr | $320K |
| Strong Wind | Low | 1.10 / yr | $528K |
| Earthquake | Very Low | 0.00 / yr | $218K |
| Tornado | Low | 0.13 / yr | $566K |
| Winter Weather | Very Low | 8.47 / yr | $20K |
| Wildfire | Very Low | 0.00 / yr | $9K |
| Cold Wave | Very Low | 1.68 / yr | $160K |
| Avalanche | Very Low | 0.00 / yr | $0 |
| Coastal Flood | Very Low | 0.00 / yr | $0 |
| Tsunami | Very Low | 0.00 / yr | $0 |
| Volcanic Activity | Very Low | 0.00 / yr | $0 |
Frequently Asked Questions
What is the overall natural disaster risk for Washington County?
Washington County has a composite FEMA National Risk Index score of 64.4 out of 100, placing it in the Low category and the 64th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Washington County?
The three highest-rated hazards are Landslide (Medium, $43K EAL), Riverine Flood (Medium, $19M EAL), Ice Storm (Medium, $238K EAL). These account for most of the county's expected annual losses.
How does Washington County compare to other Ohio counties?
Washington County ranks #33 of 88 Ohio counties for overall natural disaster risk, with a low rating.
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. Washington County's $22M EAL is a statistical average, not a guarantee for any specific year or address.