EPA Zone Data 2026
Connecticut Radon Map, Levels & Testing Guide
View EPA radon zone classifications for every county in Connecticut. Open your county to compare basement test meaning, EPA action thresholds, and when mitigation pricing becomes worth checking.
4
Zone 1
High Risk
High Risk
3
Zone 2
Moderate
Moderate
1
Zone 3
Low Risk
Low Risk
Already Tested
View Connecticut Cost Estimates
If you already have a radon result, skip the directory and move straight to local price guidance.
Need a Number First
Read the Testing Guide
Use the fastest valid radon test setup before you compare quotes or ask whether mitigation is worth it.
Browse Counties
Jump to the Directory
Open your county to see its EPA zone, testing meaning, and the point where mitigation becomes worth pricing.
Already tested? Get your itemized mitigation cost estimate.
View Connecticut Mitigation Cost Estimates ->