Onaka, SD Radon Mitigation and Testing

Q: What EPA Radon Zone is Onaka in?

Onaka is in Faulk County, EPA Zone 1.

Q: How much does radon mitigation cost in Onaka?

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

Faulk County

EPA Zone 1

Located in Faulk County within zip code 57466, Onaka sits in central South Dakota where glacial till deposits over Pierre Shale formations contribute to significant radon potential. The EPA Zone 1 classification reflects the high radon risk common throughout this region of the Great Plains. With testing data currently unavailable for this rural community, residents should prioritize professional radon testing given the geological conditions and zone classification.

Onaka, SD Radon Mitigation

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

Onaka, SD Radon Testing

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

Onaka Radon Facts

Key details about the radon risk profile for Onaka and the 57466 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Faulk County, SD

Zip Code

57466

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Onaka and the 57466 zip code are located in Faulk 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 Onaka, SD

What EPA Radon Zone is Onaka in?

Onaka and the 57466 zip code are in Faulk 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 Onaka?

Radon mitigation in Onaka 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 Onaka?

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