Delaware County
Iowa — Natural Disaster Risk Assessment
LowComposite Risk Score
National percentile: 50th
Delaware County faces low composite natural disaster risk (NRI Risk Index score 49.7, 50th national percentile), driven primarily by hail and drought exposure. Expected annual loss across all 18 hazard types is $17M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Top Hazards
All 18 Hazard Risks
| Hail | Medium | 4.51 / yr | $1M |
| Drought | Medium | 11.20 / yr | $1M |
| Strong Wind | Medium | 5.40 / yr | $1M |
| Landslide | Low | 0.11 / yr | $5K |
| Riverine Flood | Low | 1.21 / yr | $10M |
| Tornado | Low | 0.49 / yr | $2M |
| Cold Wave | Low | 8.11 / yr | $1M |
| Winter Weather | Low | 16.89 / yr | $53K |
| Heat Wave | Very Low | 4.68 / yr | $179K |
| Ice Storm | Low | 0.24 / yr | $31K |
| Lightning | Low | 40.48 / yr | $107K |
| Earthquake | Very Low | 0.00 / yr | $46K |
| Hurricane | Very Low | 0.01 / yr | $6K |
| Wildfire | Very Low | 0.00 / yr | $4K |
| 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 Delaware County?
Delaware County has a composite FEMA National Risk Index score of 49.7 out of 100, placing it in the Low category and the 50th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Delaware County?
The three highest-rated hazards are Hail (Medium, $1M EAL), Drought (Medium, $1M EAL), Strong Wind (Medium, $1M EAL). These account for most of the county's expected annual losses.
How does Delaware County compare to other Iowa counties?
Delaware County ranks #26 of 99 Iowa 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. Delaware County's $17M EAL is a statistical average, not a guarantee for any specific year or address.