Markesan, WI Radon Levels

Q: What EPA Radon Zone is Markesan in?

Markesan is in Green Lake County, EPA Zone 1.

Q: How much does radon mitigation cost in Markesan?

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

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

Markesan, WI Radon Facts

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

County Green Lake County, WI

Zip Code 53946

Located in Green Lake County in south-central Wisconsin, Markesan sits within glacial terrain that can create favorable conditions for radon accumulation. While testing data for this community remains limited, Wisconsin's high radon potential across most counties makes individual home testing essential. The area's typical full-basement construction and rural character create settings where radon concentrations require professional assessment.

6.00

pCi/L area average

Above EPA Action Level

Green Lake County average: 6.00 pCi/L, based on 1 user-submitted test across 1 city in the county. No homeowner readings have been submitted for Markesan 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+

Markesan, 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 Markesan, WI

No homeowner tests have been submitted for Markesan 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
Green Lake	9.2 mi	6.00 pCi/L	1
Beaver Dam	19.3 mi	10.00 pCi/L	1
Pardeeville	20.2 mi	4.00 pCi/L	1
Fall River	21.8 mi	10.00 pCi/L	1
Fond Du Lac	24.6 mi	5.00 pCi/L	1
Portage	25.8 mi	9.00 pCi/L	1
Wautoma	27.5 mi	15.00 pCi/L	1
Juneau	28.2 mi	4.00 pCi/L	1

Green Lake County Radon Profile

Green Lake County falls in EPA Radon Zone 1, meaning the local uranium-bearing geology is predicted to drive average indoor radon screening levels above the EPA's 4 pCi/L action threshold. Homeowner-submitted tests from 1 city in Green Lake County average 6.00 pCi/L across 1 test — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. Since radon is the second leading cause of lung cancer nationally, the EPA urges every household in Green Lake County to test, as levels can differ between neighboring homes.

Radon FAQ for Markesan, WI

What EPA Radon Zone is Markesan in?

Markesan and the 53946 zip code are in Green Lake 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 Markesan?

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

Radon mitigation in Markesan 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 Markesan?

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.