Norwalk, WI Radon Levels

Q: What EPA Radon Zone is Norwalk in?

Norwalk is in Monroe County, EPA Zone 2.

Q: How much does radon mitigation cost in Norwalk?

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

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

Norwalk, WI Radon Facts

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

County Monroe County, WI

Zip Code 54648

Located in Monroe County in west-central Wisconsin, Norwalk sits in an area where glacial deposits over limestone bedrock create variable radon conditions. While specific radon testing data for the 54648 zip code area is limited, homeowners are encouraged to test their properties. Given the geological context and housing stock typical of rural Wisconsin communities, radon levels can vary significantly from home to home.

6.33

pCi/L area average

Above EPA Action Level

Monroe County average: 6.33 pCi/L, based on 3 user-submitted tests across 2 cities in the county. No homeowner readings have been submitted for Norwalk 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+

Norwalk, 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 Norwalk, WI

No homeowner tests have been submitted for Norwalk 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
Sparta	11.8 mi	5.00 pCi/L	2
Westby	14.2 mi	5.00 pCi/L	1
Kendall	15.6 mi	9.00 pCi/L	1
Viroqua	21.4 mi	5.00 pCi/L	1
Onalaska	28.1 mi	3.00 pCi/L	1
Holmen	30.5 mi	2.00 pCi/L	1
La Valle	32.3 mi	9.00 pCi/L	2
Black River Falls	34.2 mi	9.00 pCi/L	1

Monroe County Radon Profile

The soils and bedrock of Monroe 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 2 cities in Monroe County average 6.33 pCi/L across 3 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 Monroe County to test, as levels can differ between neighboring homes.

Radon FAQ for Norwalk, WI

What EPA Radon Zone is Norwalk in?

Norwalk and the 54648 zip code are in Monroe 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 Norwalk?

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

Radon mitigation in Norwalk 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 Norwalk?

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.