Wisconsin Dells, WI Radon Levels

Q: What EPA Radon Zone is Wisconsin Dells in?

Wisconsin Dells is in Sauk County, EPA Zone 2.

Q: How much does radon mitigation cost in Wisconsin Dells?

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

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

Wisconsin Dells, WI Radon Facts

EPA Radon Zone Zone 2 — Moderate Risk 2–4 pCi/L (Zone 2)

County Sauk County, WI

Zip Code 53965

Famous for its distinctive sandstone gorges, Wisconsin Dells in Sauk County combines tourism infrastructure with residential neighborhoods built on unique geological formations within the Madison Metro area. Radon testing data for the 53965 zip code currently remains limited, though the area's mixed geology of sandstone and glacial deposits can produce varying radon concentrations. Homeowners should conduct testing, particularly in properties with basements carved into the region's characteristic rock formations.

6.75

pCi/L area average

Above EPA Action Level

Sauk County average: 6.75 pCi/L, based on 4 user-submitted tests across 3 cities in the county. No homeowner readings have been submitted for Wisconsin Dells 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+

Wisconsin Dells, 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 Wisconsin Dells, WI

No homeowner tests have been submitted for Wisconsin Dells 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
Reedsburg	14.1 mi	5.00 pCi/L	1
Portage	16.3 mi	9.00 pCi/L	1
La Valle	18.9 mi	9.00 pCi/L	2
Pardeeville	23.5 mi	4.00 pCi/L	1
Friendship	23.5 mi	20.00 pCi/L	1
Coloma	29.4 mi	17.00 pCi/L	1
Arlington	30.2 mi	6.00 pCi/L	1
Necedah	30.3 mi	7.50 pCi/L	2

Sauk County Radon Profile

The soils and bedrock of Sauk County place it in EPA Radon Zone 2, a moderate-risk classification with predicted indoor averages of 2 to 4 pCi/L. Homeowner-submitted tests from 3 cities in Sauk County average 6.75 pCi/L across 4 tests — 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 Sauk County to test, as levels can differ between neighboring homes.

Radon FAQ for Wisconsin Dells, WI

What EPA Radon Zone is Wisconsin Dells in?

Wisconsin Dells and the 53965 zip code are in Sauk County, which has an EPA assigned Radon Zone of 2. A zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L.

Why are radon readings shown from areas near Wisconsin Dells?

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

Radon mitigation in Wisconsin Dells 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 Wisconsin Dells?

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.