FEMA NRI v1.20Released December 2025Methodology

Utah Disaster Risk

Natural disaster risk data for all 29 counties.

FEMA release

December 2025

Mean county NRI score

36.2

Counties with Data

of 29 total

County risk atlas

Utah hazard exposure by county

FEMA NRI v1.20 scores on a 0–100 relative scale. Toggle the composite and five selected hazard categories out of FEMA's 18. Flood is the higher of Coastal Flooding and Inland Flooding NRI scores.

Counties

29/29

Mean county NRI score

36.2

Risk layers

Highest Risk Counties

Salt Lake County

Relatively High

NRI score 98.6

Utah County

Relatively High

NRI score 95.3

Washington County

Relatively Moderate

NRI score 92.8

Davis County

Relatively Moderate

NRI score 87.8

Weber County

Relatively Moderate

NRI score 87.0

Lowest Risk Counties

Rich County

Very Low

NRI score 0.8

Piute County

Very Low

NRI score 0.9

Wayne County

Very Low

NRI score 1.9

Morgan County

Very Low

NRI score 3.5

Daggett County

Very Low

NRI score 3.7

All Utah Counties

County	NRI score	FEMA Rating	Flood	Wildfire	Tornado	Earthquake
Salt Lake County	98.6	Relatively High	92.9	98.3	71.0	99.6
Utah County	95.3	Relatively High	90.5	98.9	52.6	98.8
Washington County	92.8	Relatively Moderate	93.4	99.8	6.0	81.1
Davis County	87.8	Relatively Moderate	59.5	90.6	34.4	98.0
Weber County	87.0	Relatively Moderate	67.6	94.1	32.0	97.7
Cache County	66.5	Relatively Low	45.8	85.3	21.2	94.6
Iron County	61.4	Relatively Low	44.6	97.7	4.0	86.8
Summit County	60.1	Relatively Low	49.6	96.5	13.6	55.5
Box Elder County	55.9	Relatively Low	19.5	95.4	12.6	93.3
Tooele County	48.9	Relatively Low	18.3	97.3	13.6	83.6
Kane County	39.7	Very Low	56.4	88.0	1.6	37.9
Sanpete County	38.6	Very Low	24.5	89.0	12.5	83.4
Garfield County	37.6	Very Low	48.8	78.3	2.4	64.1
Wasatch County	33.5	Very Low	32.3	94.2	11.8	59.0
San Juan County	26.8	Very Low	24.0	82.3	5.4	55.7
Sevier County	22.7	Very Low	22.1	78.6	5.2	87.0
Millard County	22.2	Very Low	16.3	91.2	8.1	83.2
Juab County	15.3	Very Low	4.8	91.0	7.1	79.3
Beaver County	10.4	Very Low	8.0	85.3	1.7	74.4
Grand County	10.3	Very Low	25.4	58.6	5.0	32.7
Carbon County	8.7	Very Low	22.8	66.8	12.3	64.9
Duchesne County	7.6	Very Low	15.3	80.4	7.0	60.0
Emery County	7.0	Very Low	12.4	59.3	5.1	66.0
Uintah County	4.0	Very Low	10.3	71.4	9.6	56.9
Daggett County	3.7	Very Low	0.9	77.7	2.3	18.9
Morgan County	3.5	Very Low	10.7	84.1	5.6	32.9
Wayne County	1.9	Very Low	6.9	53.7	2.2	47.8
Piute County	0.9	Very Low	3.4	58.7	1.3	49.2
Rich County	0.8	Very Low	3.0	75.9	2.8	36.8

Frequently Asked Questions

How many Utah county records are included?

RiskByCounty includes 29 Utah county records from FEMA NRI v1.20 (December 2025).

Which FEMA county ratings appear in Utah?

FEMA NRI v1.20 (December 2025) county rating counts for Utah: Very Low: 19; Relatively Low: 5; Relatively Moderate: 3; Relatively High: 2; Very High: 0; Not available: 0.

How complete are the five selected hazard fields for Utah?

FEMA NRI v1.20 (December 2025) availability among 29 county records: Flood: 29 of 29; Wildfire: 29 of 29; Tornado: 29 of 29; Earthquake: 29 of 29; Hurricane: 0 of 29. RiskByCounty displays five selected hazard categories out of FEMA's 18.

Official Ready.gov resource

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

Visit Ready.gov →

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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