Castlewood, SD Radon Mitigation and Testing

Q: What EPA Radon Zone is Castlewood in?

Castlewood is in Hamlin County, EPA Zone 1.

Q: How much does radon mitigation cost in Castlewood?

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

Hamlin County

EPA Zone 1

Positioned in Hamlin County across South Dakota's glacial prairie landscape, Castlewood sits where ancient lake deposits and glacial till create variable soil conditions. With no current testing data available for the 57223 zip code area, homeowners should conduct radon measurements to establish baseline levels. The community's predominantly older housing stock with full basements makes testing particularly important.

Castlewood, SD Radon Mitigation

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

Castlewood, SD Radon Testing

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

Castlewood Radon Facts

Key details about the radon risk profile for Castlewood and the 57223 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Hamlin County, SD

Zip Code

57223

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Castlewood and the 57223 zip code are located in Hamlin 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 Castlewood, SD

What EPA Radon Zone is Castlewood in?

Castlewood and the 57223 zip code are in Hamlin 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 Castlewood?

Radon mitigation in Castlewood 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 Castlewood?

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