Isabel, SD Radon Mitigation and Testing

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.

Dewey County

EPA Zone 2

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.

Isabel, SD Radon Testing

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

Isabel Radon Facts

Key details about the radon risk profile for Isabel and the 57633 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Dewey County, SD

Zip Code

57633

Predicted Screening Level

2–4 pCi/L (Zone 2)

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

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 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