EPA Zone Data 2026
CT Radon Levels
View EPA radon zone classifications for every county in CT. Select your county to see detailed risk data, testing recommendations, and mitigation cost estimates.
4
Zone 1
High Risk
High Risk
3
Zone 2
Moderate
Moderate
1
Zone 3
Low Risk
Low Risk
Fairfield
Zone 1
Hartford
Zone 3
Litchfield
Zone 2
Middlesex
Zone 1
New Haven
Zone 1
New London
Zone 1
Tolland
Zone 2
Windham
Zone 2
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