Radon Levels in South Dakota
66 counties — 48 high risk, 18 moderate, 0 low risk
South Dakota Radon Zone Map
Counties colored by EPA radon zone. Red = Zone 1, Orange = Zone 2, Green = Zone 3.
Highest-Risk Counties
AuroraZone 1 — High
BeadleZone 1 — High
Bon HommeZone 1 — High
BrookingsZone 1 — High
BrownZone 1 — High
BruleZone 1 — High
BuffaloZone 1 — High
CampbellZone 1 — High
Charles MixZone 1 — High
ClarkZone 1 — High
ClayZone 1 — High
CodingtonZone 1 — High
+36 more
Check Your South Dakota ZIP Code
All 66 Counties — By Radon Risk
Sources: EPA Map of Radon Zones, CDC Environmental Health Tracking Network
Frequently Asked Questions
How many counties in South Dakota have high radon risk?
South Dakota has 48 counties classified as EPA Zone 1 (high radon risk), 18 as Zone 2 (moderate), and 0 as Zone 3 (low risk).
Is radon a problem in South Dakota?
South Dakota has 48 high-risk counties where elevated radon is likely. The EPA recommends all homes in South Dakota be tested for radon, regardless of which zone they're in.
How do I check radon levels for my South Dakota address?
Enter your ZIP code in the search box above to see your county's EPA radon zone and available testing data. For your specific home's radon level, you'll need a radon test kit.