Arizona earthquake risk
Yuma County has the highest earthquake risk in Arizona, scoring 98.4 out of 100 — rated "Relatively High" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
|---|---|---|---|
| 1 | Yuma County | 98.4 | Relatively High |
| 2 | Maricopa County | 96.8 | Relatively Moderate |
| 3 | Pima County | 91.7 | Relatively Moderate |
| 4 | Coconino County | 90.4 | Relatively Moderate |
| 5 | Mohave County | 87.1 | Relatively Low |
| 6 | Yavapai County | 85.3 | Relatively Low |
| 7 | Navajo County | 81.2 | Relatively Low |
| 8 | Pinal County | 79.8 | Relatively Low |
| 9 | La Paz County | 79 | Relatively Low |
| 10 | Cochise County | 78.5 | Relatively Low |
| 11 | Apache County | 67.7 | Relatively Low |
| 12 | Gila County | 59 | Very Low |
| 13 | Graham County | 47.9 | Very Low |
| 14 | Santa Cruz County | 43.5 | Very Low |
| 15 | Greenlee County | 22 | Very Low |
Source: FEMA National Risk Index v1.20.0, December 2025. Scores are 0–100 percentile rankings among all US counties. See the methodology page for definitions. Download the full CSV for all counties.
Earthquake risk nationally:
Other hazard risks in Arizona:
Frequently asked questions
What is the highest earthquake risk county in Arizona?
Yuma County, AZ has the highest earthquake risk in Arizona, with a FEMA National Risk Index score of 98.4 out of 100 (rated "Relatively High").
What causes earthquake risk in Arizona?
Earthquake risk reflects expected annual losses from ground shaking. High scores concentrate in California, the Pacific Northwest, Alaska, and the New Madrid Seismic Zone (spanning Missouri, Arkansas, Tennessee, and neighboring states). NOAA's Storm Events Database does not track earthquakes, so recorded event counts are not shown.