Castlewood, SD Radon Levels

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.

Check local Castlewood radon levels and find certified testing and mitigation professionals to keep your home safe

Castlewood, SD Radon Facts

EPA Radon Zone Zone 1 — High Risk > 4.0 pCi/L (Zone 1)

County Hamlin County, SD

Zip Code 57223

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.

Need Radon Mitigation or Testing in Castlewood?

100% Free, No-Obligation Quotes
Matches You with State-Licensed Hamlin County Pros

1-800-299-3578 Toll-free · Mon–Fri 8am–6pm ET

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 in South Dakota with the most user-submitted radon test data, ranked by number of submissions.

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