Warren County
Iowa — Natural Disaster Risk Assessment
Very LowComposite Risk Score
National percentile: 36th
Warren County faces very low composite natural disaster risk (NRI Risk Index score 36.1, 36th national percentile), driven primarily by drought and landslide exposure. Expected annual loss across all 18 hazard types is $19M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Top Hazards
All 18 Hazard Risks
| Drought | High | 6.15 / yr | $3M |
| Landslide | Low | 0.27 / yr | $12K |
| Tornado | Medium | 0.50 / yr | $4M |
| Heat Wave | Low | 7.53 / yr | $1M |
| Lightning | Medium | 45.36 / yr | $560K |
| Wildfire | Very Low | 0.00 / yr | $132K |
| Strong Wind | Medium | 5.70 / yr | $1M |
| Ice Storm | Low | 0.84 / yr | $148K |
| Hail | Low | 5.88 / yr | $416K |
| Cold Wave | Low | 5.16 / yr | $1M |
| Riverine Flood | Low | 2.86 / yr | $7M |
| Winter Weather | Low | 12.95 / yr | $39K |
| Earthquake | Very Low | 0.00 / yr | $49K |
| Hurricane | Very Low | 0.01 / yr | $1K |
| 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 Warren County?
Warren County has a composite FEMA National Risk Index score of 36.1 out of 100, placing it in the Very Low category and the 36th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Warren County?
The three highest-rated hazards are Drought (High, $3M EAL), Landslide (Low, $12K EAL), Tornado (Medium, $4M EAL). These account for most of the county's expected annual losses.
How does Warren County compare to other Iowa counties?
Warren County ranks #50 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. Warren County's $19M EAL is a statistical average, not a guarantee for any specific year or address.