Sevier County
Utah — Natural Disaster Risk Assessment
Very LowComposite Risk Score
National percentile: 23th
Sevier County faces very low composite natural disaster risk (NRI Risk Index score 22.7, 23th national percentile), driven primarily by earthquake and avalanche exposure. Expected annual loss across all 18 hazard types is $10M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Top Hazards
All 18 Hazard Risks
| Earthquake | Low | 0.02 / yr | $4M |
| Avalanche | Medium | 0.17 / yr | $691K |
| Landslide | Low | 2.50 / yr | $20K |
| Wildfire | Low | 0.00 / yr | $452K |
| Lightning | Medium | 45.11 / yr | $657K |
| Winter Weather | Medium | 29.69 / yr | $164K |
| Drought | Low | 83.56 / yr | $229K |
| Volcanic Activity | Very Low | 0.00 / yr | $10 |
| Heat Wave | Very Low | 0.30 / yr | $152K |
| Riverine Flood | Very Low | 0.50 / yr | $3M |
| Ice Storm | Very Low | 0.01 / yr | $6K |
| Strong Wind | Very Low | 0.11 / yr | $66K |
| Tornado | Very Low | 0.04 / yr | $28K |
| Cold Wave | Very Low | 0.00 / yr | $0 |
| Hail | Very Low | 0.08 / yr | $2K |
| Coastal Flood | Very Low | 0.00 / yr | $0 |
| Hurricane | Very Low | 0.00 / yr | $0 |
| Tsunami | Very Low | 0.00 / yr | $0 |
Frequently Asked Questions
What is the overall natural disaster risk for Sevier County?
Sevier County has a composite FEMA National Risk Index score of 22.7 out of 100, placing it in the Very Low category and the 23th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Sevier County?
The three highest-rated hazards are Earthquake (Low, $4M EAL), Avalanche (Medium, $691K EAL), Landslide (Low, $20K EAL). These account for most of the county's expected annual losses.
How does Sevier County compare to other Utah counties?
Sevier County ranks #16 of 29 Utah counties for overall natural disaster risk, with a very 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. Sevier County's $10M EAL is a statistical average, not a guarantee for any specific year or address.