riskbycounty
FEMA NRI v1.20Released December 2025Methodology

Sonoma County Disaster Risk

Sonoma County, California

FEMA Risk Rating

Relatively High

NRI score (0–100 relative scale)

99.1

FEMA composite county value

State Rank

#13

of 58, sorted high to low by RiskByCounty

Flood NRI score

99.2

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.

Earthquake

99.5 / 100

Flood

99.2 / 100

Higher of FEMA Coastal Flooding (68.6) and Inland Flooding (99.2) NRI scores.

Wildfire

98.2 / 100

Tornado

15.4 / 100

FEMA NRI data summary

Selected hazard scores for Sonoma County

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

Earthquake
99.5
Flood
99.2
Wildfire
98.2
Tornado
15.4
Hurricane
Not available

Higher of FEMA Coastal Flooding and Inland Flooding NRI scores

Displayed flood score
99.2
Coastal Flooding
68.6
Inland Flooding
99.2

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 California county records are included?
RiskByCounty includes 58 California county records from FEMA NRI v1.20 (December 2025).
Which FEMA county ratings appear in California?
FEMA NRI v1.20 (December 2025) county rating counts for California: Very Low: 3; Relatively Low: 7; Relatively Moderate: 17; Relatively High: 22; Very High: 9; Not available: 0.
How complete are the five selected hazard fields for California?
FEMA NRI v1.20 (December 2025) availability among 58 county records: Flood: 58 of 58; Wildfire: 58 of 58; Tornado: 58 of 58; Earthquake: 58 of 58; Hurricane: 8 of 58. RiskByCounty displays five selected hazard categories out of FEMA's 18.
What FEMA NRI information is available for Sonoma County, CA?
Sonoma County has an official FEMA NRI v1.20 composite rating of Relatively High and an NRI score (0–100 relative scale) of 99.1. RiskByCounty ranks it 13th of 58 California county records when sorting the FEMA composite NRI scores from high to low.
Which selected hazard scores are shown for Sonoma County?
RiskByCounty displays five selected hazard categories out of FEMA's 18 using FEMA NRI v1.20 (December 2025). For Sonoma County, Earthquake: 99.5; Flood: 99.2; Wildfire: 98.2; Tornado: 15.4.
How is flood displayed for Sonoma County?
RiskByCounty's flood display is the higher of FEMA Coastal Flooding and Inland Flooding NRI scores. For Sonoma County, Coastal Flooding is 68.6, Inland Flooding is 99.2, and the displayed flood score is 99.2.

Counties with Similar Risk

Santa Barbara County

California

-0.1

Relatively High

NRI score 99.0

San Mateo County

California

+0.2

Relatively High

NRI score 99.2

Kern County

California

-0.2

Relatively High

NRI score 98.9

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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