Granville, IA Radon Mitigation and Testing

Q: What EPA Radon Zone is Granville in?

Granville is in Sioux County, EPA Zone 1.

Q: How much does radon mitigation cost in Granville?

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

Sioux County

EPA Zone 1

Located in Sioux County in northwestern Iowa, Granville sits on glacial till deposits over limestone bedrock that contribute to Iowa's consistently high radon potential across the region. Although specific radon data for zip code 51022 is not yet available, Iowa typically produces some of the nation's highest indoor radon levels. Given the state's geology and EPA Zone 1 designation, all Granville homeowners should prioritize radon testing and be prepared for potential mitigation needs.

Granville, IA Radon Mitigation

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

Granville, IA Radon Testing

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

Granville Radon Facts

Key details about the radon risk profile for Granville and the 51022 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Sioux County, IA

Zip Code

51022

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Granville and the 51022 zip code are located in Sioux 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 Granville, IA

What EPA Radon Zone is Granville in?

Granville and the 51022 zip code are in Sioux 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 Granville?

Radon mitigation in Granville 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 Granville?

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