Darien, WI Radon Levels

Q: What EPA Radon Zone is Darien in?

Darien is in Walworth County, EPA Zone 1.

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

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

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

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

Darien, WI Radon Facts

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

County Walworth County, WI

Zip Code 53114

Southern Wisconsin's Walworth County sits in EPA Zone 1 within the Janesville Metro area, where glacial deposits and underlying dolomite bedrock create conditions highly favorable for radon production. The region's housing mix includes older farmhouses and newer suburban developments, most with basements typical of Wisconsin construction. Testing data for zip code 53114 is currently unavailable, making individual home testing essential given the area's high radon potential and predominant basement construction.

6.71

pCi/L area average

Above EPA Action Level

Walworth County average: 6.71 pCi/L, based on 7 user-submitted tests across 6 cities in the county. No homeowner readings have been submitted for Darien 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+

Darien, 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 Darien, WI

No homeowner tests have been submitted for Darien 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
Delavan	6.5 mi	6.00 pCi/L	1
Fontana	10.0 mi	4.50 pCi/L	2
Williams Bay	10.7 mi	12.00 pCi/L	1
Elkhorn	12.6 mi	5.00 pCi/L	1
Lake Geneva	15.0 mi	5.00 pCi/L	1
Milton	16.2 mi	11.50 pCi/L	2
Genoa City	21.0 mi	10.00 pCi/L	1
Burlington	24.7 mi	7.00 pCi/L	1

Walworth County Radon Profile

The bedrock and soils beneath Walworth 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 6 cities in Walworth County average 6.71 pCi/L across 7 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 Walworth County.

Radon FAQ for Darien, WI

What EPA Radon Zone is Darien in?

Darien and the 53114 zip code are in Walworth 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 Darien?

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

Radon mitigation in Darien 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 Darien?

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.