Stephan, SD Radon Mitigation and Testing

Q: What EPA Radon Zone is Stephan in?

Stephan is in Hyde County, EPA Zone 1.

Q: How much does radon mitigation cost in Stephan?

Radon mitigation typically costs between $800 and $2,000. Most standard systems fall in the $1,000-$1,500 range.

Hyde County

EPA Zone 1

Central South Dakota's Stephan lies within Hyde County, where Pierre Shale formations and glacial till deposits create variable radon conditions across the prairie landscape. With limited testing data available for zip code 57346, homeowners should establish baseline measurements through professional assessment. The region's mixed geological conditions make individual property testing particularly important.

Stephan, SD Radon Mitigation

Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.

Stephan, SD Radon Testing

Finding qualified radon testing professionals is the first step toward protecting your home.

Stephan Radon Facts

Key details about the radon risk profile for Stephan and the 57346 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Hyde County, SD

Zip Code

57346

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Stephan and the 57346 zip code are located in Hyde County, which has an EPA assigned Radon Zone of 1. A radon zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Stephan, SD

What EPA Radon Zone is Stephan in?

Stephan and the 57346 zip code are in Hyde County, which has an EPA assigned Radon Zone of 1. A zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L.

How much does radon mitigation cost in Stephan?

Radon mitigation in Stephan typically costs between $800 and $2,000. Most homes with standard basements can be mitigated with a sub-slab depressurization system in the $1,000–$1,500 range. Factors that can increase cost include complex foundations, crawl spaces, or very high radon levels.

Should I test for radon if I'm buying a home in Stephan?

Yes. Radon testing should be part of every home purchase. A short-term radon test is typically included as part of the home inspection process and costs $150–$250. If elevated levels are found, you can negotiate mitigation as part of the sale.

Most Active Radon Markets in South Dakota

Cities with the most user-submitted radon test data in the state.

City	Avg User Radon Level	Submissions
Spearfish	7.75 pCi/L	4
Rapid City	10.50 pCi/L	2
Aberdeen	8.50 pCi/L	2
Sioux Falls	6.00 pCi/L	2
Watertown	6.00 pCi/L	2