riskbycounty
FEMA NRI v1.20Released December 2025Methodology

Ada County Disaster Risk

Ada County, Idaho

FEMA Risk Rating

Relatively Moderate

NRI score (0–100 relative scale)

87.8

FEMA composite county value

State Rank

#1

of 44, sorted high to low by RiskByCounty

Flood NRI score

89.8

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.

Wildfire

98.3 / 100

Flood

89.8 / 100

Higher of FEMA Coastal Flooding (Not available) and Inland Flooding (89.8) NRI scores.

Earthquake

88.2 / 100

Tornado

27.0 / 100

FEMA NRI data summary

Selected hazard scores for Ada County

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

Wildfire
98.3
Flood
89.8
Earthquake
88.2
Tornado
27.0
Hurricane
Not available

Higher of FEMA Coastal Flooding and Inland Flooding NRI scores

Displayed flood score
89.8
Coastal Flooding
Not available
Inland Flooding
89.8

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.

Visit Ready.gov →

Frequently Asked Questions

How many Idaho county records are included?
RiskByCounty includes 44 Idaho county records from FEMA NRI v1.20 (December 2025).
Which FEMA county ratings appear in Idaho?
FEMA NRI v1.20 (December 2025) county rating counts for Idaho: Very Low: 25; Relatively Low: 17; Relatively Moderate: 2; Relatively High: 0; Very High: 0; Not available: 0.
How complete are the five selected hazard fields for Idaho?
FEMA NRI v1.20 (December 2025) availability among 44 county records: Flood: 44 of 44; Wildfire: 44 of 44; Tornado: 44 of 44; Earthquake: 44 of 44; Hurricane: 0 of 44. RiskByCounty displays five selected hazard categories out of FEMA's 18.
What FEMA NRI information is available for Ada County, ID?
Ada County has an official FEMA NRI v1.20 composite rating of Relatively Moderate and an NRI score (0–100 relative scale) of 87.8. RiskByCounty ranks it 1st of 44 Idaho county records when sorting the FEMA composite NRI scores from high to low.
Which selected hazard scores are shown for Ada County?
RiskByCounty displays five selected hazard categories out of FEMA's 18 using FEMA NRI v1.20 (December 2025). For Ada County, Wildfire: 98.3; Flood: 89.8; Earthquake: 88.2; Tornado: 27.0.
How is flood displayed for Ada County?
RiskByCounty's flood display is the higher of FEMA Coastal Flooding and Inland Flooding NRI scores. For Ada County, Coastal Flooding is Not available, Inland Flooding is 89.8, and the displayed flood score is 89.8.

Counties with Similar Risk

Bonneville County

Idaho

-5.3

Relatively Moderate

NRI score 82.4

Kootenai County

Idaho

-8.8

Relatively Low

NRI score 79.0

Idaho County

Idaho

-9.4

Relatively Low

NRI score 78.4

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.

Explore more data for Ada County

Property TaxCost of LivingCrime RateIncomeHealthSchoolsWater QualityWeatherCounty Score