North Sioux City, SD Radon Mitigation and Testing

Q: What EPA Radon Zone is North Sioux City in?

North Sioux City is in Union County, EPA Zone 1.

Q: How much does radon mitigation cost in North Sioux City?

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

Union County

EPA Zone 1

Situated in Union County along the Missouri River valley, North Sioux City sits on river terrace deposits over Cretaceous shale formations that can influence radon levels. The community in zip code 57049 features suburban housing built primarily from the 1970s onward, with varied foundation types including full basements and walkout configurations. While radon testing data is currently limited, homeowners should consider testing given South Dakota's moderate radon potential and the area's geological setting.

North Sioux City, SD Radon Mitigation

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

North Sioux City, SD Radon Testing

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

North Sioux City Radon Facts

Key details about the radon risk profile for North Sioux City and the 57049 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Union County, SD

Zip Code

57049

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

North Sioux City and the 57049 zip code are located in Union 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 North Sioux City, SD

What EPA Radon Zone is North Sioux City in?

North Sioux City and the 57049 zip code are in Union 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 North Sioux City?

Radon mitigation in North Sioux City 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 North Sioux City?

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