EPA Zone Data 2026
Maine Radon Map, Levels & Testing Guide
View EPA radon zone classifications for every county in Maine. Open your county to compare basement test meaning, EPA action thresholds, and when mitigation pricing becomes worth checking.
12
Zone 1
High Risk
High Risk
4
Zone 2
Moderate
Moderate
0
Zone 3
Low Risk
Low Risk
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Browse Counties
Jump to the Directory
Open your county to see its EPA zone, testing meaning, and the point where mitigation becomes worth pricing.
Androscoggin County
Zone 1
Aroostook County
Zone 1
Cumberland County
Zone 1
Franklin County
Zone 1
Hancock County
Zone 1
Kennebec County
Zone 1
Knox County
Zone 2
Lincoln County
Zone 1
Oxford County
Zone 1
Penobscot County
Zone 1
Piscataquis County
Zone 1
Sagadahoc County
Zone 2
Somerset County
Zone 1
Waldo County
Zone 2
Washington County
Zone 2
York County
Zone 1
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