riskbycounty
FEMA NRI v1.20Released December 2025Methodology

Butler County Disaster Risk

Butler County, Iowa

FEMA Risk Rating

Very Low

NRI score (0–100 relative scale)

27.1

FEMA composite county value

State Rank

#72

of 99, sorted high to low by RiskByCounty

Flood NRI score

37.2

higher coastal/inland value

Hazard Risk Breakdown

Five selected hazard categories out of FEMA's 18. Values are FEMA NRI v1.20 scores on a 0–100 relative scale.

Tornado

48.3 / 100

Flood

37.2 / 100

Higher of FEMA Coastal Flooding (Not available) and Inland Flooding (37.2) NRI scores.

Wildfire

22.4 / 100

Hurricane

10.0 / 100

Earthquake

9.2 / 100

FEMA NRI data summary

Selected hazard scores for Butler County

Among the five hazard categories displayed by RiskByCounty, tornado has the highest NRI score for this county.

Tornado
48.3
Flood
37.2
Wildfire
22.4
Hurricane
10.0
Earthquake
9.2

Higher of FEMA Coastal Flooding and Inland Flooding NRI scores

Displayed flood score
37.2
Coastal Flooding
Not available
Inland Flooding
37.2

These five categories are a selected subset of FEMA's 18 natural hazards. FEMA's composite score and official rating are separate fields in the National Risk Index dataset.

FEMA National Risk Index documentation

Official Ready.gov resource

Continue to Ready.gov for federal emergency-planning information maintained outside RiskByCounty.

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Frequently Asked Questions

How many Iowa county records are included?
RiskByCounty includes 99 Iowa county records from FEMA NRI v1.20 (December 2025).
Which FEMA county ratings appear in Iowa?
FEMA NRI v1.20 (December 2025) county rating counts for Iowa: Very Low: 64; Relatively Low: 30; Relatively Moderate: 5; Relatively High: 0; Very High: 0; Not available: 0.
How complete are the five selected hazard fields for Iowa?
FEMA NRI v1.20 (December 2025) availability among 99 county records: Flood: 99 of 99; Wildfire: 99 of 99; Tornado: 99 of 99; Earthquake: 99 of 99; Hurricane: 82 of 99. RiskByCounty displays five selected hazard categories out of FEMA's 18.
What FEMA NRI information is available for Butler County, IA?
Butler County has an official FEMA NRI v1.20 composite rating of Very Low and an NRI score (0–100 relative scale) of 27.1. RiskByCounty ranks it 72nd of 99 Iowa county records when sorting the FEMA composite NRI scores from high to low.
Which selected hazard scores are shown for Butler County?
RiskByCounty displays five selected hazard categories out of FEMA's 18 using FEMA NRI v1.20 (December 2025). For Butler County, Tornado: 48.3; Flood: 37.2; Wildfire: 22.4; Hurricane: 10.0; Earthquake: 9.2.
How is flood displayed for Butler County?
RiskByCounty's flood display is the higher of FEMA Coastal Flooding and Inland Flooding NRI scores. For Butler County, Coastal Flooding is Not available, Inland Flooding is 37.2, and the displayed flood score is 37.2.

Counties with Similar Risk

Jefferson County

Iowa

-0.0

Very Low

NRI score 27.1

Sac County

Iowa

+0.2

Very Low

NRI score 27.3

Guthrie County

Iowa

-0.6

Very Low

NRI score 26.5

Published by RiskByCounty

County summaries are deterministic transformations of frozen FEMA county fields. No external subject-matter reviewer is credited.

Published · Updated

Data Source

County data sourced from FEMA National Risk Index v1.20, released December 2025. Values are labeled NRI score (0–100 relative scale). RiskByCounty displays five selected hazard categories out of FEMA's 18; flood is the higher of the Coastal Flooding and Inland Flooding source scores.

RiskByCounty presents county-level source fields and deterministic arithmetic summaries.

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