Custer, WI Radon Levels

Q: What EPA Radon Zone is Custer in?

Custer is in Portage County, EPA Zone 1.

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

No homeowner radon tests have been submitted for Custer yet, so readings from the closest cities and the Portage 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 Custer?

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

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

Custer, WI Radon Facts

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

County Portage County, WI

Zip Code 54423

Positioned in Portage County in central Wisconsin, Custer sits on glacial outwash deposits over crystalline bedrock that can produce elevated radon levels. Testing data for this 54423 community remains unavailable, making professional radon testing crucial for area residents. The region's sandy soils over granite and gneiss bedrock suggest significant potential for radon accumulation.

6.00

pCi/L area average

Above EPA Action Level

Portage County average: 6.00 pCi/L, based on 3 user-submitted tests across 1 city in the county. No homeowner readings have been submitted for Custer 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+

Custer, 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 Custer, WI

No homeowner tests have been submitted for Custer 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
Stevens Point	6.4 mi	6.00 pCi/L	3
Mosinee	20.9 mi	6.00 pCi/L	1
Wittenberg	21.6 mi	11.00 pCi/L	1
Wisconsin Rapids	25.5 mi	4.50 pCi/L	2
Nekoosa	30.2 mi	6.00 pCi/L	1
Hancock	30.7 mi	5.00 pCi/L	1
Stratford	35.2 mi	13.00 pCi/L	1
Wautoma	35.4 mi	15.00 pCi/L	1

Portage County Radon Profile

The bedrock and soils beneath Portage County are classified by the EPA as Radon Zone 1, the highest-risk tier, with predicted average indoor screening levels above 4 pCi/L. Homeowner-submitted tests from 1 city in Portage County average 6.00 pCi/L across 3 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. Radon is the second leading cause of lung cancer in the United States, and a short-term test is the only way to confirm a specific home's level in Portage County.

Radon FAQ for Custer, WI

What EPA Radon Zone is Custer in?

Custer and the 54423 zip code are in Portage 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 Custer?

No homeowner radon tests have been submitted for Custer yet. Because radon is driven by regional soil and bedrock geology, readings from the closest cities—and the Portage County average—are the best available indicator of local conditions until Custer 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 Custer?

Radon mitigation in Custer 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 Custer?

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.