riskbycounty
FEMA NRI v1.20Released December 2025Methodology

Island County Disaster Risk

Island County, Washington

FEMA Risk Rating

Relatively Low

NRI score (0–100 relative scale)

78.0

FEMA composite county value

State Rank

#21

of 39, sorted high to low by RiskByCounty

Flood NRI score

73.4

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.

Earthquake

96.3 / 100

Flood

73.4 / 100

Higher of FEMA Coastal Flooding (73.4) and Inland Flooding (54.9) NRI scores.

Wildfire

35.4 / 100

Tornado

11.3 / 100

FEMA NRI data summary

Selected hazard scores for Island County

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

Earthquake
96.3
Flood
73.4
Wildfire
35.4
Tornado
11.3
Hurricane
Not available

Higher of FEMA Coastal Flooding and Inland Flooding NRI scores

Displayed flood score
73.4
Coastal Flooding
73.4
Inland Flooding
54.9

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

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Frequently Asked Questions

How many Washington county records are included?
RiskByCounty includes 39 Washington county records from FEMA NRI v1.20 (December 2025).
Which FEMA county ratings appear in Washington?
FEMA NRI v1.20 (December 2025) county rating counts for Washington: Very Low: 8; Relatively Low: 11; Relatively Moderate: 15; Relatively High: 4; Very High: 1; Not available: 0.
How complete are the five selected hazard fields for Washington?
FEMA NRI v1.20 (December 2025) availability among 39 county records: Flood: 39 of 39; Wildfire: 39 of 39; Tornado: 39 of 39; Earthquake: 39 of 39; Hurricane: 0 of 39. RiskByCounty displays five selected hazard categories out of FEMA's 18.
What FEMA NRI information is available for Island County, WA?
Island County has an official FEMA NRI v1.20 composite rating of Relatively Low and an NRI score (0–100 relative scale) of 78.0. RiskByCounty ranks it 21st of 39 Washington county records when sorting the FEMA composite NRI scores from high to low.
Which selected hazard scores are shown for Island County?
RiskByCounty displays five selected hazard categories out of FEMA's 18 using FEMA NRI v1.20 (December 2025). For Island County, Earthquake: 96.3; Flood: 73.4; Wildfire: 35.4; Tornado: 11.3.
How is flood displayed for Island County?
RiskByCounty's flood display is the higher of FEMA Coastal Flooding and Inland Flooding NRI scores. For Island County, Coastal Flooding is 73.4, Inland Flooding is 54.9, and the displayed flood score is 73.4.

Counties with Similar Risk

Grant County

Washington

-1.0

Relatively Low

NRI score 76.9

Douglas County

Washington

-3.9

Relatively Low

NRI score 74.1

Klickitat County

Washington

-4.1

Relatively Low

NRI score 73.9

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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