Onaka, SD Radon Levels

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.

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

Onaka, SD Radon Facts

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

County Faulk County, SD

Zip Code 57466

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.

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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 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