Marathon, WI Radon Levels

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.

Check local Marathon radon levels and find certified testing and mitigation professionals to keep your home safe

Marathon, WI Radon Facts

EPA Radon Zone Zone 1 — High Risk > 4.0 pCi/L (Zone 1)

County Marathon County, WI

Zip Code 54448

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.

9.50

pCi/L area average

Above EPA Action Level

Marathon County average: 9.50 pCi/L, based on 2 user-submitted tests across 2 cities in the county. No homeowner readings have been submitted for Marathon itself yet, so this county figure is the closest available benchmark. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Marathon, WI Radon Mitigation

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

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Radon Readings Near Marathon, WI

No homeowner tests have been submitted for Marathon yet. The closest cities with user-submitted radon data are shown below — explore them to gauge local conditions. Radon varies by home, so testing is the only way to know your level.

City	Distance	Avg User Level	Readings
Mosinee	11.8 mi	6.00 pCi/L	1
Stratford	14.4 mi	13.00 pCi/L	1
Marshfield	24.8 mi	13.50 pCi/L	2
Medford	29.2 mi	7.50 pCi/L	2
Stevens Point	30.8 mi	6.00 pCi/L	3
Gleason	33.4 mi	4.00 pCi/L	2
Wittenberg	33.8 mi	11.00 pCi/L	1
Antigo	36.9 mi	19.00 pCi/L	1

Marathon County Radon Profile

Because of its underlying geology, Marathon County is mapped as EPA Radon Zone 1 — the most elevated classification — where predicted indoor screening averages exceed 4 pCi/L. Homeowner-submitted tests from 2 cities in Marathon County average 9.50 pCi/L across 2 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. As the second leading cause of lung cancer in the U.S., radon warrants testing in every Marathon County home regardless of zone or a neighbor's results.

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.

Why are radon readings shown from areas near Marathon?

No homeowner radon tests have been submitted for Marathon yet. Because radon is driven by regional soil and bedrock geology, readings from the closest cities—and the Marathon County average—are the best available indicator of local conditions until Marathon homeowners submit their own results. The EPA still recommends testing every individual home, since levels can vary significantly from house to house.

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.