FEMA NRI v1.20Released December 2025Methodology

Arizona Disaster Risk

Natural disaster risk data for all 15 counties.

FEMA release

December 2025

Mean county NRI score

84.5

Counties with Data

of 15 total

County risk atlas

Arizona 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

15/15

Mean county NRI score

84.5

Risk layers

Highest Risk Counties

Maricopa County

Very High

NRI score 99.9

Pima County

Relatively High

NRI score 99.1

Mohave County

Relatively High

NRI score 94.8

Coconino County

Relatively Moderate

NRI score 94.2

Pinal County

Relatively Moderate

NRI score 93.8

Lowest Risk Counties

Greenlee County

Very Low

NRI score 12.4

Graham County

Relatively Low

NRI score 64.6

Apache County

Relatively Low

NRI score 78.8

La Paz County

Relatively Moderate

NRI score 83.5

Navajo County

Relatively Moderate

NRI score 88.1

All Arizona Counties

County	NRI score	FEMA Rating	Flood	Wildfire	Tornado	Earthquake
Maricopa County	99.9	Very High	99.9	99.6	84.0	96.8
Pima County	99.1	Relatively High	99.5	99.7	37.5	91.7
Mohave County	94.8	Relatively High	97.1	98.8	3.3	87.1
Coconino County	94.2	Relatively Moderate	96.5	99.4	24.3	90.4
Pinal County	93.8	Relatively Moderate	96.4	98.0	37.1	79.8
Yavapai County	93.7	Relatively Moderate	96.1	99.6	32.7	85.3
Cochise County	92.8	Relatively Moderate	93.8	99.2	10.4	78.5
Yuma County	92.6	Relatively Moderate	91.0	59.2	14.0	98.4
Gila County	90.2	Relatively Moderate	93.1	99.1	13.4	59.0
Santa Cruz County	88.3	Relatively Moderate	87.4	98.1	8.7	43.5
Navajo County	88.1	Relatively Moderate	89.5	98.8	8.0	81.2
La Paz County	83.5	Relatively Moderate	91.5	70.2	4.6	79.0
Apache County	78.8	Relatively Low	80.7	97.9	3.6	67.7
Graham County	64.6	Relatively Low	67.9	94.3	2.7	47.9
Greenlee County	12.4	Very Low	29.6	82.5	1.2	22.0

Frequently Asked Questions

How many Arizona county records are included?

RiskByCounty includes 15 Arizona county records from FEMA NRI v1.20 (December 2025).

Which FEMA county ratings appear in Arizona?

FEMA NRI v1.20 (December 2025) county rating counts for Arizona: Very Low: 1; Relatively Low: 2; Relatively Moderate: 9; Relatively High: 2; Very High: 1; Not available: 0.

How complete are the five selected hazard fields for Arizona?

FEMA NRI v1.20 (December 2025) availability among 15 county records: Flood: 15 of 15; Wildfire: 15 of 15; Tornado: 15 of 15; Earthquake: 15 of 15; Hurricane: 15 of 15. 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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