Clark, SD Radon Levels

Q: What EPA Radon Zone is Clark in?

Clark is in Clark County, EPA Zone 1.

Q: How much does radon mitigation cost in Clark?

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

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

Clark, SD Radon Facts

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

County Clark County, SD

Zip Code 57225

Serving as the Clark County seat in northeastern South Dakota, this community sits on prairie pothole geology that contributes to the state's EPA Zone 1 radon classification. Testing data for zip code 57225 is currently unavailable, though South Dakota's glacial till soils and underlying Pierre Shale can create significant radon accumulation potential. Rural homeowners should consider testing as essential, given the area's agricultural soils and varied residential foundation types.

Clark, SD Radon Mitigation

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Radon FAQ for Clark, SD

What EPA Radon Zone is Clark in?

Clark and the 57225 zip code are in Clark 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 Clark?

Radon mitigation in Clark 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 Clark?

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