Lyon County
Nevada — Natural Disaster Risk Assessment
LowComposite Risk Score
National percentile: 71th
Lyon County faces low composite natural disaster risk (NRI Risk Index score 71.4, 71th national percentile), driven primarily by wildfire and earthquake exposure. Expected annual loss across all 18 hazard types is $33M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Top Hazards
All 18 Hazard Risks
| Wildfire | Medium | 0.01 / yr | $7M |
| Earthquake | Medium | 0.05 / yr | $12M |
| Winter Weather | High | 6.51 / yr | $476K |
| Drought | Medium | 98.89 / yr | $570K |
| Heat Wave | Low | 4.00 / yr | $893K |
| Riverine Flood | Low | 1.00 / yr | $11M |
| Lightning | Low | 18.17 / yr | $313K |
| Volcanic Activity | Very Low | 0.00 / yr | $15 |
| Landslide | Very Low | 3.97 / yr | $473 |
| Ice Storm | Low | 0.01 / yr | $44K |
| Hail | Very Low | 0.15 / yr | $151K |
| Strong Wind | Low | 0.15 / yr | $264K |
| Avalanche | Very Low | 0.01 / yr | $48 |
| Tornado | Very Low | 0.07 / yr | $4K |
| Coastal Flood | Very Low | 0.00 / yr | $0 |
| Cold Wave | 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 Lyon County?
Lyon County has a composite FEMA National Risk Index score of 71.4 out of 100, placing it in the Low category and the 71th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Lyon County?
The three highest-rated hazards are Wildfire (Medium, $7M EAL), Earthquake (Medium, $12M EAL), Winter Weather (High, $476K EAL). These account for most of the county's expected annual losses.
How does Lyon County compare to other Nevada counties?
Lyon County ranks #7 of 17 Nevada 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. Lyon County's $33M EAL is a statistical average, not a guarantee for any specific year or address.