Arizona Natural Disaster Risk by County
Of Arizona's 15 counties, 1 has a Very High natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025); the highest is Maricopa County (score 99.9 of 100), and expected losses across the state total $3.6 billion a year.
OpenFEMA lists 117 federal disaster, emergency and fire management declarations for Arizona since 1966 (not counting COVID-19); the latest is DR-4911-AZ, Severe Storms and Flooding, declared 29 May 2026.
Live weather alerts for Arizona Latest FEMA declarations All official warnings
Most exposed counties, hazard by hazard
Top 10 by FEMA hazard risk scoreHurricane 11 rated
| # | County | Rating | Loss a year |
|---|---|---|---|
| 1 | Cochise County | Very Low | $13,964 |
| 2 | Maricopa County | Very Low | $11,770 |
| 3 | Yuma County | Very Low | $5,574 |
| 4 | Pinal County | Very Low | $5,069 |
| 5 | Pima County | Very Low | $4,770 |
| 6 | Santa Cruz County | Very Low | $2,740 |
| 7 | La Paz County | Very Low | $2,349 |
| 8 | Graham County | Very Low | $2,455 |
| 9 | Apache County | Very Low | $1,346 |
| 10 | Gila County | Very Low | $582 |
Tornado 15 rated
| # | County | Rating | Loss a year |
|---|---|---|---|
| 1 | Maricopa County | Relatively Moderate | $5.4 million |
| 2 | Pima County | Relatively Low | $688,346 |
| 3 | Pinal County | Relatively Low | $712,380 |
| 4 | Yavapai County | Relatively Low | $451,087 |
| 5 | Coconino County | Very Low | $295,855 |
| 6 | Yuma County | Very Low | $90,637 |
| 7 | Gila County | Very Low | $72,701 |
| 8 | Cochise County | Very Low | $49,988 |
| 9 | Santa Cruz County | Very Low | $29,688 |
| 10 | Navajo County | Very Low | $24,832 |
Inland flooding 15 rated
| # | County | Rating | Loss a year |
|---|---|---|---|
| 1 | Maricopa County | Very High | $1.1 billion |
| 2 | Pima County | Very High | $347 million |
| 3 | Mohave County | Relatively High | $74 million |
| 4 | Coconino County | Relatively High | $86 million |
| 5 | Pinal County | Relatively High | $92 million |
| 6 | Yavapai County | Relatively High | $70 million |
| 7 | Cochise County | Relatively High | $44 million |
| 8 | Gila County | Relatively Moderate | $35 million |
| 9 | La Paz County | Relatively Moderate | $24 million |
| 10 | Yuma County | Relatively Moderate | $32 million |
Wildfire 15 rated
| # | County | Rating | Loss a year |
|---|---|---|---|
| 1 | Pima County | Relatively High | $38 million |
| 2 | Maricopa County | Relatively High | $42 million |
| 3 | Yavapai County | Relatively High | $29 million |
| 4 | Coconino County | Relatively High | $29 million |
| 5 | Cochise County | Relatively High | $19 million |
| 6 | Gila County | Relatively High | $17 million |
| 7 | Mohave County | Relatively High | $14 million |
| 8 | Navajo County | Relatively High | $12 million |
| 9 | Santa Cruz County | Relatively High | $7.9 million |
| 10 | Pinal County | Relatively High | $12 million |
Earthquake 15 rated
| # | County | Rating | Loss a year |
|---|---|---|---|
| 1 | Yuma County | Relatively High | $52 million |
| 2 | Maricopa County | Relatively Moderate | $31 million |
| 3 | Pima County | Relatively Moderate | $6.3 million |
| 4 | Coconino County | Relatively Moderate | $4.7 million |
| 5 | Mohave County | Relatively Low | $2.1 million |
| 6 | Yavapai County | Relatively Low | $2.2 million |
| 7 | Navajo County | Relatively Low | $1.0 million |
| 8 | Pinal County | Relatively Low | $1.5 million |
| 9 | La Paz County | Relatively Low | $800,515 |
| 10 | Cochise County | Relatively Low | $1.0 million |
Every Arizona county, highest overall risk first
15| # | County | Overall risk | Score | Loss a year | Top hazard | Declarations | Tornadoes |
|---|---|---|---|---|---|---|---|
| 1 | Maricopa County | Very High | 99.9 | $2.2 billion | Heat wave | 24 | 75 |
| 2 | Pima County | Relatively High | 99.1 | $531 million | Heat wave | 13 | 28 |
| 3 | Mohave County | Relatively High | 94.8 | $105 million | Wildfire | 13 | 17 |
| 4 | Coconino County | Relatively Moderate | 94.2 | $131 million | Lightning | 22 | 49 |
| 5 | Pinal County | Relatively Moderate | 93.8 | $137 million | Heat wave | 21 | 30 |
| 6 | Yavapai County | Relatively Moderate | 93.7 | $108 million | Wildfire | 24 | 29 |
| 7 | Cochise County | Relatively Moderate | 92.8 | $91 million | Wildfire | 12 | 18 |
| 8 | Yuma County | Relatively Moderate | 92.6 | $91 million | Earthquake | 4 | 12 |
| 9 | Gila County | Relatively Moderate | 90.2 | $55 million | Wildfire | 21 | 4 |
| 10 | Santa Cruz County | Relatively Moderate | 88.3 | $42 million | Heat wave | 6 | 1 |
| 11 | Navajo County | Relatively Moderate | 88.1 | $40 million | Lightning | 19 | 23 |
| 12 | La Paz County | Relatively Moderate | 83.5 | $28 million | Inland flooding | 5 | 1 |
| 13 | Apache County | Relatively Low | 78.8 | $21 million | Lightning | 14 | 17 |
| 14 | Graham County | Relatively Low | 64.6 | $18 million | Heat wave | 11 | 1 |
| 15 | Greenlee County | Very Low | 12.4 | $5.3 million | Wildfire | 11 | 0 |
Score: FEMA's national percentile (higher = more risk). Declarations: federal declarations that named the county since 1953, not counting COVID-19. Tornadoes: NOAA SPC tornadoes that touched the county, 1950–2025.
Latest federal declarations in Arizona
Other states and territories
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What this page shows, and what it misses
FEMA's National Risk Index compares every US county with every other for 18 natural hazards, combining expected losses with social vulnerability and community resilience. It is a planning-level estimate for nationwide comparison, not a flood-zone map and not the risk to any one property — for flood zones use FEMA's Flood Map Service Center ↗. Federal declarations exclude state declarations and SBA or USDA designations.
Federal Emergency Management Agency (FEMA), National Risk Index Dataset: National Risk Index Counties - v1.20.0 (December 2025). Retrieved from https://services.arcgis.com/XG15cJAlne2vxtgt/ArcGIS/rest/services/National_Risk_Index_Counties/FeatureServer/0/query on November 2, 2026, 1:20 PM EST. This product uses the Federal Emergency Management Agency’s National Risk Index dataset API or downloadable datasets but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Federal Emergency Management Agency (FEMA), OpenFEMA Dataset: Disaster Declarations Summaries - v2, retrieved from https://www.fema.gov/api/open/v2/DisasterDeclarationsSummaries on November 2, 2026, 1:21 PM EST. This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Tornado records: NOAA/NWS Storm Prediction Center, Severe Weather Database, tornadoes 1950–2025 (https://www.spc.noaa.gov/wcm/data/1950-2025_actual_tornadoes.csv, downloaded 2 November 2026). Public domain; not endorsed by NOAA. Compiled by Global Incident Tracker.
Questions about Arizona
Which county in Arizona has the highest natural disaster risk?
Of Arizona's 15 counties, 1 has a Very High natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025); the highest is Maricopa County (score 99.9 of 100), and expected losses across the state total $3.6 billion a year.
Which Arizona counties are most at risk from tornadoes?
By FEMA's National Risk Index tornado risk score: Maricopa County, Pima County, Pinal County. These are planning-level estimates for whole counties, not maps of individual properties.
Which Arizona counties are most at risk from hurricanes?
By FEMA's National Risk Index hurricane risk score: Cochise County, Maricopa County, Yuma County. These are planning-level estimates for whole counties, not maps of individual properties.
How many FEMA disaster declarations has Arizona had?
OpenFEMA lists 117 federal disaster, emergency and fire management declarations for Arizona since 1966 (not counting COVID-19); the latest is DR-4911-AZ, Severe Storms and Flooding, declared 29 May 2026.