Willow Lake, SD Radon Mitigation and Testing

Q: What EPA Radon Zone is Willow Lake in?

Willow Lake is in Clark County, EPA Zone 1.

Q: How much does radon mitigation cost in Willow Lake?

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

Clark County

EPA Zone 1

Nestled in Clark County within South Dakota's glacial prairie region, Willow Lake falls in EPA Zone 1 due to uranium-rich glacial deposits and underlying Pierre Shale that create high radon potential throughout northeastern South Dakota. Although specific testing data for zip code 57278 is currently limited, the area's geological conditions strongly favor radon accumulation, particularly in the full-basement homes common to this region. Professional radon testing should be a priority for all local residents.

Willow Lake, SD Radon Mitigation

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

Willow Lake, SD Radon Testing

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

Willow Lake Radon Facts

Key details about the radon risk profile for Willow Lake and the 57278 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Clark County, SD

Zip Code

57278

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Willow Lake and the 57278 zip code are located in Clark 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 Willow Lake, SD

What EPA Radon Zone is Willow Lake in?

Willow Lake and the 57278 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 Willow Lake?

Radon mitigation in Willow Lake 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 Willow Lake?

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