Navajo County
Arizona — Natural Disaster Risk Assessment
MediumComposite Risk Score
National percentile: 88th
Navajo County faces medium composite natural disaster risk (NRI Risk Index score 88.1, 88th national percentile), driven primarily by lightning and wildfire exposure. Expected annual loss across all 18 hazard types is $40M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Top Hazards
All 18 Hazard Risks
| Lightning | Very High | 47.60 / yr | $3M |
| Wildfire | High | 0.00 / yr | $12M |
| Winter Weather | Very High | 5.79 / yr | $522K |
| Landslide | Medium | 2.54 / yr | $57K |
| Riverine Flood | Medium | 4.14 / yr | $20M |
| Earthquake | Low | 0.00 / yr | $1M |
| Cold Wave | Medium | 0.02 / yr | $1M |
| Ice Storm | Medium | 0.01 / yr | $86K |
| Heat Wave | Low | 0.77 / yr | $281K |
| Volcanic Activity | Very Low | 0.00 / yr | $9 |
| Drought | Low | 102.78 / yr | $92K |
| Avalanche | Very Low | 0.01 / yr | $325 |
| Strong Wind | Low | 0.06 / yr | $231K |
| Hail | Low | 0.11 / yr | $80K |
| Tornado | Very Low | 0.39 / yr | $25K |
| 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 Navajo County?
Navajo County has a composite FEMA National Risk Index score of 88.1 out of 100, placing it in the Medium category and the 88th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Navajo County?
The three highest-rated hazards are Lightning (Very High, $3M EAL), Wildfire (High, $12M EAL), Winter Weather (Very High, $522K EAL). These account for most of the county's expected annual losses.
How does Navajo County compare to other Arizona counties?
Navajo County ranks #11 of 15 Arizona counties for overall natural disaster risk, with a medium 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. Navajo County's $40M EAL is a statistical average, not a guarantee for any specific year or address.