EPA Zone Data 2026
District of Columbia Radon Map, Levels & Testing Guide
View EPA radon zone classifications for every county in District of Columbia. Open your county to compare basement test meaning, EPA action thresholds, and when mitigation pricing becomes worth checking.
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Zone 1
High Risk
High Risk
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Zone 2
Moderate
Moderate
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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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Use the fastest valid radon test setup before you compare quotes or ask whether mitigation is worth it.
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Open your county to see its EPA zone, testing meaning, and the point where mitigation becomes worth pricing.
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