Marathon, WI Radon Mitigation and Testing

Q: What EPA Radon Zone is Marathon in?

Marathon is in Marathon County, EPA Zone 1.

Q: How much does radon mitigation cost in Marathon?

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

Marathon County

EPA Zone 1

Located in Marathon County within central Wisconsin's glaciated landscape, this community sits where Precambrian bedrock and glacial deposits create complex radon potential patterns. While comprehensive testing data for zip code 54448 remains limited, the area's geological foundations warrant homeowner attention to indoor air quality monitoring. Professional radon testing is advisable given the region's known variability in soil composition and underlying rock formations.

Marathon, WI Radon Mitigation

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

Marathon, WI Radon Testing

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

Marathon Radon Facts

Key details about the radon risk profile for Marathon and the 54448 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Marathon County, WI

Zip Code

54448

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Marathon and the 54448 zip code are located in Marathon 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 Marathon, WI

What EPA Radon Zone is Marathon in?

Marathon and the 54448 zip code are in Marathon 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 Marathon?

Radon mitigation in Marathon 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 Marathon?

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 Wisconsin

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

City	Avg User Radon Level	Submissions
Milwaukee	10.00 pCi/L	3
Prairie Du Chien	10.00 pCi/L	2
Stevens Point	5.50 pCi/L	2
Menomonie	10.00 pCi/L	1
Delavan	6.00 pCi/L	1
Shawano	No submissions	0
Sturgeon Bay	No submissions	0