riskbycounty
FEMA NRI v1.20Released December 2025Methodology

Prince William County Disaster Risk

Prince William County, Virginia

FEMA Risk Rating

Relatively Moderate

NRI score (0–100 relative scale)

83.2

FEMA composite county value

State Rank

#4

of 133, sorted high to low by RiskByCounty

Flood NRI score

88.0

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.

Flood

88.0 / 100

Higher of FEMA Coastal Flooding (48.8) and Inland Flooding (88.0) NRI scores.

Hurricane

83.0 / 100

Earthquake

80.9 / 100

Tornado

76.5 / 100

Wildfire

18.2 / 100

FEMA NRI data summary

Selected hazard scores for Prince William County

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

Flood
88.0
Hurricane
83.0
Earthquake
80.9
Tornado
76.5
Wildfire
18.2

Higher of FEMA Coastal Flooding and Inland Flooding NRI scores

Displayed flood score
88.0
Coastal Flooding
48.8
Inland Flooding
88.0

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 Virginia county records are included?
RiskByCounty includes 133 Virginia county records from FEMA NRI v1.20 (December 2025).
Which FEMA county ratings appear in Virginia?
FEMA NRI v1.20 (December 2025) county rating counts for Virginia: Very Low: 85; Relatively Low: 42; Relatively Moderate: 5; Relatively High: 1; Very High: 0; Not available: 0.
How complete are the five selected hazard fields for Virginia?
FEMA NRI v1.20 (December 2025) availability among 133 county records: Flood: 133 of 133; Wildfire: 133 of 133; Tornado: 133 of 133; Earthquake: 133 of 133; Hurricane: 133 of 133. RiskByCounty displays five selected hazard categories out of FEMA's 18.
What FEMA NRI information is available for Prince William County, VA?
Prince William County has an official FEMA NRI v1.20 composite rating of Relatively Moderate and an NRI score (0–100 relative scale) of 83.2. RiskByCounty ranks it 4th of 133 Virginia county records when sorting the FEMA composite NRI scores from high to low.
Which selected hazard scores are shown for Prince William County?
RiskByCounty displays five selected hazard categories out of FEMA's 18 using FEMA NRI v1.20 (December 2025). For Prince William County, Flood: 88.0; Hurricane: 83.0; Earthquake: 80.9; Tornado: 76.5; Wildfire: 18.2.
How is flood displayed for Prince William County?
RiskByCounty's flood display is the higher of FEMA Coastal Flooding and Inland Flooding NRI scores. For Prince William County, Coastal Flooding is 48.8, Inland Flooding is 88.0, and the displayed flood score is 88.0.

Counties with Similar Risk

Henrico County

Virginia

+0.2

Relatively Moderate

NRI score 83.4

Chesterfield County

Virginia

+1.7

Relatively Moderate

NRI score 84.8

Norfolk city

Virginia

-1.9

Relatively Moderate

NRI score 81.2

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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