Radon Levels in Arizona

15 counties — 0 high risk, 15 moderate, 0 low risk

15
Zone 1 High (0.0%) Zone 2 Moderate (100.0%) Zone 3 Low (0.0%)

Arizona Radon Zone Map

Counties colored by EPA radon zone. Red = Zone 1, Orange = Zone 2, Green = Zone 3.

Check Your Arizona ZIP Code

All 15 Counties — By Radon Risk

CountyEPA ZoneTests% Above 4 pCi/L
Apache Moderate 9 —
Cochise Moderate 25 40%
Coconino Moderate 17 29.4%
Gila Moderate 10 50%
Graham Moderate 4 —
Greenlee Moderate — —
La Paz Moderate 5 —
Maricopa Moderate 631 32.6%
Mohave Moderate 48 50%
Navajo Moderate 13 38.5%
Pima Moderate 173 33.5%
Pinal Moderate 68 36.8%
Santa Cruz Moderate 8 —
Yavapai Moderate 54 42.6%
Yuma Moderate 29 37.9%

Sources: EPA Map of Radon Zones, CDC Environmental Health Tracking Network

Frequently Asked Questions

How many counties in Arizona have high radon risk?

Arizona has 0 counties classified as EPA Zone 1 (high radon risk), 15 as Zone 2 (moderate), and 0 as Zone 3 (low risk).

Is radon a problem in Arizona?

The EPA recommends all homes in Arizona be tested for radon, regardless of which zone they're in.

How do I check radon levels for my Arizona address?

Enter your ZIP code in the search box above to see your county's EPA radon zone and available testing data. For your specific home's radon level, you'll need a radon test kit.