Hamilton County Disaster Risk
Hamilton County, Iowa
FEMA Risk Rating
Relatively Low
National Percentile
43th
of 3,144 counties
State Rank
#35
of 99 (1 = highest risk)
Flood Risk
41th
percentile
Hazard Risk Breakdown
Flood
River, coastal, and surface flooding risk
Very Low
Higher than 41% of US counties
Wildfire
Wildland and wildland-urban interface fire risk
Very Low
Higher than 13% of US counties
Tornado
Tornado and severe thunderstorm risk
Relatively Low
Higher than 65% of US counties
Earthquake
Seismic activity and ground shaking risk
Very Low
Higher than 17% of US counties
Hurricane
Tropical cyclone and hurricane risk
Very Low
Higher than 19% of US counties
Risk Overview
About Natural Disaster Risk in Hamilton County, Iowa
Hamilton faces moderate US risk
Hamilton County's composite risk score of 42.91 sits modestly above the national average, earning a "Relatively Low" rating. The county experiences above-typical natural disaster exposure for an American county, though overall risk remains manageable.
Above-average for Iowa
Hamilton County scores 42.91 against Iowa's 39.68 state average, placing it among the higher-risk counties statewide. The county faces more natural hazard exposure than most of its peers across Iowa.
Higher-risk central Iowa county
Hamilton County's 42.91 score ranks it riskier than nearby Guthrie (26.53) and Grundy (13.14) counties, approaching the risk level of Fayette (50.89) to the east. It represents the highest-risk county in its immediate west-central region.
Tornado and flood lead threats
Tornado risk scores 64.79 in Hamilton County, making it the dominant hazard residents face. Flood risk at 41.03 follows closely, creating a water and wind threat environment requiring comprehensive household preparedness.
Secure flood and tornado coverage
Hamilton County residents should maintain homeowners insurance with explicit tornado and wind coverage, plus obtain flood insurance through the National Flood Insurance Program given the county's 41.03 flood risk score. Identify a basement safe room and create a flood response plan focusing on evacuation routes and property protection.
Source: FEMA National Risk Index · Narrative reviewed by Evan Brooks, Data Editor
Preparedness Guide
What to Prepare for in Hamilton County
Top Hazards by Exposure
Source: FEMA National Risk Index v1.19.0 · Percentiles are national (3,144 counties)
Risk Advisory: Hamilton County
Risk Verdict
Hamilton County's FEMA risk score places it at the 43th percentile nationally, indicating lower-than-typical exposure for a U.S. county. Hamilton County's 43th percentile ranking is favorable, though every county carries at least one natural hazard worth knowing — reviewing the specific risks listed above helps households focus their preparedness where it matters most.
Hazard Breakdown
Tornado risk is Hamilton County's dominant natural hazard, ranked at the 65th percentile nationally under FEMA's National Risk Index. Flood ranks second at the 41th percentile nationally. Additional tracked hazards include hurricane (19th percentile), earthquake (17th percentile), wildfire (13th percentile).
Preparedness Context
Tornado exposure at the 65th percentile nationally makes Hamilton County a county where a battery-powered weather radio — not just smartphone apps — is a worthwhile household investment, given that mobile networks often fail during severe storms. Flood is the second hazard driver for Hamilton County at the 41th percentile nationally, meaning households should maintain awareness of both severe-weather and flood-specific warning systems. In Hamilton County, tornado watches indicate favorable atmospheric conditions while warnings mean rotation has been detected — households benefit from understanding this distinction so they shelter immediately on a warning, not after seeking visual confirmation.
Regional Context
Hamilton County sits within 3.2 composite points of the Iowa state average, suggesting the county's hazard exposure is representative of the broader regional pattern.
Is your household prepared for Hamilton County's hazards?
Review FEMA's county-specific preparedness checklists and emergency planning guides.
Frequently Asked Questions
What is the natural disaster risk in Hamilton County, IA?
What types of natural hazards affect Hamilton County?
How does Hamilton County risk compare to the Iowa average?
Is Hamilton County at risk for tornado?
How is natural disaster risk measured?
Why is Hamilton County higher risk than average?
Data Source
Risk data sourced from the FEMA National Risk Index (NRI). Risk scores are relative rankings (0–100) across all US counties — not absolute risk measures. Higher scores indicate higher relative risk compared to other counties.
Disclaimer: This data is informational only. It is not financial, insurance, or legal advice. Always consult a qualified professional before making insurance or real estate decisions.