EPA Zone Data 2026
Arizona Radon Map, Levels & Testing Guide
View EPA radon zone classifications for every county in Arizona. Open your county to compare basement test meaning, EPA action thresholds, and when mitigation pricing becomes worth checking.
0
Zone 1
High Risk
High Risk
15
Zone 2
Moderate
Moderate
0
Zone 3
Low Risk
Low Risk
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If you already have a radon result, skip the directory and move straight to local price guidance.
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Browse Counties
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Open your county to see its EPA zone, testing meaning, and the point where mitigation becomes worth pricing.
Apache County
Zone 2
Cochise County
Zone 2
Coconino County
Zone 2
Gila County
Zone 2
Graham County
Zone 2
Greenlee County
Zone 2
La Paz County
Zone 2
Maricopa County
Zone 2
Mohave County
Zone 2
Navajo County
Zone 2
Pima County
Zone 2
Pinal County
Zone 2
Santa Cruz County
Zone 2
Yavapai County
Zone 2
Yuma County
Zone 2
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