Question 1

Which county in Arizona has the highest natural disaster risk?

Accepted Answer

Maricopa County has the highest natural disaster risk score in Arizona at 99.9 (Very High), based on FEMA National Risk Index data.

Question 2

Which county in Arizona is the safest from natural disasters?

Accepted Answer

Greenlee County has the lowest natural disaster risk score in Arizona at 12.4 (Very Low), based on FEMA NRI data.

Question 3

What natural disasters are most common in Arizona?

Accepted Answer

Arizona counties face varying levels of risk from floods, wildfires, tornadoes, earthquakes, and hurricanes. The FEMA National Risk Index scores each county across 18 hazard types. See individual county pages for detailed hazard breakdowns.

Question 4

How is natural disaster risk measured by county?

Accepted Answer

The FEMA National Risk Index (NRI) measures natural disaster risk using expected annual loss, social vulnerability, and community resilience. Scores are normalized nationally, with ratings from Very Low to Very High across 18 natural hazard types.

County	Risk Score	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

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