Mills County
Iowa — Natural Disaster Risk Assessment
Very LowComposite Risk Score
National percentile: 18th
Mills County faces very low composite natural disaster risk (NRI Risk Index score 18.5, 18th national percentile), driven primarily by landslide and hail exposure. Expected annual loss across all 18 hazard types is $11M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Top Hazards
All 18 Hazard Risks
| Landslide | Low | 0.20 / yr | $20K |
| Hail | Low | 6.83 / yr | $973K |
| Drought | Medium | 10.77 / yr | $614K |
| Tornado | Low | 0.38 / yr | $2M |
| Wildfire | Very Low | 0.00 / yr | $83K |
| Ice Storm | Low | 0.88 / yr | $83K |
| Heat Wave | Low | 8.21 / yr | $356K |
| Strong Wind | Low | 4.37 / yr | $535K |
| Winter Weather | Low | 12.89 / yr | $54K |
| Cold Wave | Low | 4.42 / yr | $592K |
| Riverine Flood | Very Low | 0.96 / yr | $5M |
| Lightning | Very Low | 46.61 / yr | $73K |
| Earthquake | Very Low | 0.00 / yr | $13K |
| Avalanche | Very Low | 0.00 / yr | $0 |
| Coastal Flood | Very Low | 0.00 / yr | $0 |
| Hurricane | 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 Mills County?
Mills County has a composite FEMA National Risk Index score of 18.5 out of 100, placing it in the Very Low category and the 18th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Mills County?
The three highest-rated hazards are Landslide (Low, $20K EAL), Hail (Low, $973K EAL), Drought (Medium, $614K EAL). These account for most of the county's expected annual losses.
How does Mills County compare to other Iowa counties?
Mills County ranks #87 of 99 Iowa 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. Mills County's $11M EAL is a statistical average, not a guarantee for any specific year or address.