Wausau, WI Radon Levels

Q: What EPA Radon Zone is Wausau in?

Wausau is in Marathon County, EPA Zone 1.

Q: Why are radon readings shown from areas near Wausau?

No homeowner radon tests have been submitted for Wausau yet, so readings from the closest cities and the Marathon County average are used as the best available indicator of local conditions. The EPA recommends testing every individual home.

Q: How much does radon mitigation cost in Wausau?

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

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

Wausau, WI Radon Facts

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

County Marathon County, WI

Zip Code 54401

Central Wisconsin's largest city in Marathon County, Wausau experiences the high radon potential characteristic of the state's glacial terrain. While comprehensive testing data for zip codes 54401 and 54403 is currently limited, the area's EPA Zone 1 designation reflects significant radon risk. Homeowners throughout the region should prioritize radon testing given Wisconsin's geological conditions and typical basement construction patterns.

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 Wausau 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+

Wausau, 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 Wausau, WI

No homeowner tests have been submitted for Wausau 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	11.5 mi	6.00 pCi/L	1
Wittenberg	24.1 mi	11.00 pCi/L	1
Stratford	24.5 mi	13.00 pCi/L	1
Antigo	26.2 mi	19.00 pCi/L	1
Gleason	27.1 mi	4.00 pCi/L	2
Deerbrook	28.5 mi	8.00 pCi/L	1
Stevens Point	29.3 mi	6.00 pCi/L	3
Marshfield	34.3 mi	13.50 pCi/L	2

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 Wausau, WI

What EPA Radon Zone is Wausau in?

Wausau and the 54401 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 Wausau?

No homeowner radon tests have been submitted for Wausau 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 Wausau 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 Wausau?

Radon mitigation in Wausau 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 Wausau?

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.