Isabel, SD Radon Levels

Q: What EPA Radon Zone is Isabel in?

Isabel is in Dewey County, EPA Zone 2.

Q: How much does radon mitigation cost in Isabel?

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

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

Isabel, SD Radon Facts

EPA Radon Zone Zone 2 — Moderate Risk 2–4 pCi/L (Zone 2)

County Dewey County, SD

Zip Code 57633

Located in Dewey County on the Cheyenne River Reservation in north-central South Dakota, Isabel experiences EPA Zone 2's moderate radon potential from the region's Pierre shale and Fox Hills sandstone geology. Current testing data for this rural 57633 community is limited, emphasizing the need for homeowner-initiated radon testing. The Great Plains' sedimentary rock formations and temperature extremes can create conditions where radon accumulates in residential structures during extended heating periods.

Isabel, 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 Isabel, SD

What EPA Radon Zone is Isabel in?

Isabel and the 57633 zip code are in Dewey County, which has an EPA assigned Radon Zone of 2. A zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L.

How much does radon mitigation cost in Isabel?

Radon mitigation in Isabel 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 Isabel?

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