Grenville, SD Radon Mitigation and Testing

Q: What EPA Radon Zone is Grenville in?

Grenville is in Day County, EPA Zone 1.

Q: How much does radon mitigation cost in Grenville?

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

Day County

EPA Zone 1

Positioned in Day County along South Dakota's glacial prairie, Grenville's geology features glacial till deposits over Pierre Shale formations that can trap and concentrate radon gas. Limited testing data exists for zip code 57239, making individual home testing essential for residents. Given the EPA Zone 1 classification and underlying geological conditions, homeowners should prioritize radon testing.

Grenville, SD Radon Mitigation

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

Grenville, SD Radon Testing

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

Grenville Radon Facts

Key details about the radon risk profile for Grenville and the 57239 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Day County, SD

Zip Code

57239

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Grenville and the 57239 zip code are located in Day 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 Grenville, SD

What EPA Radon Zone is Grenville in?

Grenville and the 57239 zip code are in Day 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 Grenville?

Radon mitigation in Grenville 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 Grenville?

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