Radon Levels in South Dakota
South Dakota is classified as an EPA Zone 1 state with a very high risk for radon. Average indoor radon levels range from 3 to 9 pCi/L, and approximately 47% of South Dakota homes test above the EPA action level of 4.0 pCi/L.
South Dakota Radon Summary
High Radon Risk State
South Dakota is among the higher-risk states for residential radon. The South Dakota Department of Health strongly recommends that all residents test their homes. If you have not tested your home, consider ordering a test kit or radon detector today.
Key Facts About Radon in South Dakota
- South Dakota has very high radon levels, particularly in the Black Hills area
- The Black Hills geology has significant uranium-bearing rock
- Nearly half of SD homes test above the action level
- SD DOH actively promotes radon testing
South Dakota Testing Requirements & Recommendations
South Dakota strongly recommends testing all homes.
South Dakota's radon mitigation industry is well-established given the high state-level risk.
Major Cities in South Dakota
Radon levels can vary significantly within South Dakota depending on local geology. All residents — regardless of city — should test their specific home, as neighborhood-level radon varies independently of broader state and county averages.
What Should South Dakota Residents Do?
Test Your Home
Use a short-term charcoal test kit ($15–$25) for an initial reading, or a continuous radon detector for ongoing monitoring. Test in your basement or lowest livable area.
Understand Your Result
If your result is below 2.0 pCi/L: monitor periodically. Between 2.0–4.0 pCi/L: consider mitigation. Above 4.0 pCi/L: the EPA recommends mitigation. Above 8.0 pCi/L: take action promptly.
Hire a Certified Contractor if Needed
Look for NRPP or NRSB-certified radon mitigation contractors in South Dakota. Mitigation systems typically cost $800–$2,500 and can reduce radon levels by 50–99%.
Verify with a Follow-Up Test
After mitigation, test again to confirm the system is working. Retest every 2 years, or after significant home renovations.
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