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RadonVerdict
EPA Zone Data 2026

South Dakota Radon Map, Levels & Testing Guide

View EPA radon zone classifications for every county in South Dakota. Open your county to compare basement test meaning, EPA action thresholds, and when mitigation pricing becomes worth checking.

48
Zone 1
High Risk
18
Zone 2
Moderate
0
Zone 3
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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