Spencer, WI Radon Levels

Q: What EPA Radon Zone is Spencer in?

Spencer is in Marathon County, EPA Zone 1.

Q: How much does radon mitigation cost in Spencer?

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

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

Spencer, WI Radon Facts

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

County Marathon County, WI

Zip Code 54479

Positioned in Marathon County in central Wisconsin, Spencer is situated in an area where glacial deposits over crystalline bedrock create the potential for elevated radon levels. Testing data for the 54479 area remains limited, making individual home testing particularly important for residents. The community's mix of rural properties and residential developments, many featuring basements typical of Wisconsin construction, underscores the need for radon awareness and testing.

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 Spencer 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+

Spencer, WI Radon Mitigation

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

Need Radon Mitigation or Testing in Spencer?

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Radon Readings Near Spencer, WI

No homeowner tests have been submitted for Spencer 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
Marshfield	8.5 mi	13.50 pCi/L	2
Stratford	12.9 mi	13.00 pCi/L	1
Medford	28.5 mi	7.50 pCi/L	2
Mosinee	31.0 mi	6.00 pCi/L	1
Wisconsin Rapids	33.1 mi	4.50 pCi/L	2
Nekoosa	38.0 mi	6.00 pCi/L	1
Black River Falls	39.9 mi	9.00 pCi/L	1
Stevens Point	40.4 mi	6.00 pCi/L	3

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 Spencer, WI

What EPA Radon Zone is Spencer in?

Spencer and the 54479 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 Spencer?

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

Radon mitigation in Spencer 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 Spencer?

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.