Mason County
West Virginia — Natural Disaster Risk Assessment
LowComposite Risk Score
National percentile: 57th
Mason County faces low composite natural disaster risk (NRI Risk Index score 57.4, 57th national percentile), driven primarily by landslide and riverine flood exposure. Expected annual loss across all 18 hazard types is $15M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Top Hazards
All 18 Hazard Risks
| Landslide | Medium | 0.95 / yr | $35K |
| Riverine Flood | Medium | 2.07 / yr | $13M |
| Heat Wave | Low | 4.42 / yr | $700K |
| Ice Storm | Medium | 0.42 / yr | $133K |
| Drought | Low | 4.69 / yr | $210K |
| Hurricane | Very Low | 0.03 / yr | $123K |
| Earthquake | Very Low | 0.00 / yr | $154K |
| Lightning | Low | 47.00 / yr | $141K |
| Wildfire | Very Low | 0.00 / yr | $12K |
| Hail | Very Low | 2.75 / yr | $98K |
| Winter Weather | Low | 7.79 / yr | $22K |
| Cold Wave | Very Low | 0.89 / yr | $220K |
| Strong Wind | Low | 0.78 / yr | $145K |
| Tornado | Very Low | 0.08 / yr | $125K |
| 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 Mason County?
Mason County has a composite FEMA National Risk Index score of 57.4 out of 100, placing it in the Low category and the 57th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Mason County?
The three highest-rated hazards are Landslide (Medium, $35K EAL), Riverine Flood (Medium, $13M EAL), Heat Wave (Low, $700K EAL). These account for most of the county's expected annual losses.
How does Mason County compare to other West Virginia counties?
Mason County ranks #21 of 55 West Virginia 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. Mason County's $15M EAL is a statistical average, not a guarantee for any specific year or address.