Sioux City, IA Radon Mitigation and Testing

Q: What EPA Radon Zone is Sioux City in?

Sioux City is in Woodbury County, EPA Zone 1.

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

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

Woodbury County

EPA Zone 1

Located in Woodbury County along the Missouri River in western Iowa, Sioux City spans multiple zip codes within EPA Zone 1 where high radon potential exists. The city's diverse housing stock, from historic riverside neighborhoods to modern suburban developments, includes many homes with full basements typical of Iowa construction. Without recent testing data across zip codes 51101, 51103, 51104, 51105, 51106, and 51108, residents should test their homes to establish individual radon levels.

Sioux City, IA Radon Mitigation

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

Sioux City, IA Radon Testing

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

Sioux City Radon Facts

Key details about the radon risk profile for Sioux City and the 51101 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Woodbury County, IA

Zip Code

51101

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Sioux City and the 51101 zip code are located in Woodbury 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 Sioux City, IA

What EPA Radon Zone is Sioux City in?

Sioux City and the 51101 zip code are in Woodbury 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 Sioux City?

Radon mitigation in 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 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 Iowa

Cities with the most user-submitted radon test data in the state.

City	Avg User Radon Level	Submissions
Waterloo	8.50 pCi/L	4
Ames	9.67 pCi/L	3
Fairfield	14.00 pCi/L	2
Mount Pleasant	12.00 pCi/L	2
Ottumwa	5.50 pCi/L	2
Iowa City	7.00 pCi/L	1
Muscatine	No submissions	0