Onawa, IA Radon Mitigation and Testing

Q: What EPA Radon Zone is Onawa in?

Onawa is in Monona County, EPA Zone 1.

Q: How much does radon mitigation cost in Onawa?

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

Monona County

EPA Zone 1

Nestled along the Missouri River in Monona County, Onawa's position in western Iowa's loess hills region creates variable radon conditions due to the underlying glacial deposits and sedimentary bedrock. The town's mix of older homes and newer construction, many with basements typical of Iowa housing, can trap radon gas effectively. Testing data for the 51040 area remains limited, making individual home testing essential for residents to understand their specific radon exposure risk.

Onawa, IA Radon Mitigation

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

Onawa, IA Radon Testing

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Onawa Radon Facts

Key details about the radon risk profile for Onawa and the 51040 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Monona County, IA

Zip Code

51040

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Onawa and the 51040 zip code are located in Monona 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 Onawa, IA

What EPA Radon Zone is Onawa in?

Onawa and the 51040 zip code are in Monona 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 Onawa?

Radon mitigation in Onawa 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 Onawa?

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