Avalon, WI Radon Levels

Q: What EPA Radon Zone is Avalon in?

Avalon is in Rock County, EPA Zone 1.

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

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

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

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

Avalon, WI Radon Facts

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

County Rock County, WI

Zip Code 53505

Rural Rock County encompasses Avalon in southern Wisconsin, where glacial deposits over sedimentary bedrock create variable radon conditions throughout the Janesville Metro area. With limited local testing data available, homeowners should conduct professional radon assessments to establish baseline readings for their properties. The area's agricultural character includes older farmsteads and rural residential construction that can experience different radon accumulation rates depending on foundation type and soil characteristics.

11.50

pCi/L area average

Above EPA Action Level

Rock County average: 11.50 pCi/L, based on 2 user-submitted tests across 1 city in the county. No homeowner readings have been submitted for Avalon 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+

Avalon, WI Radon Mitigation

Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.

Need Radon Mitigation or Testing in Avalon?

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Radon Readings Near Avalon, WI

No homeowner tests have been submitted for Avalon 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
Milton	10.3 mi	11.50 pCi/L	2
Delavan	10.6 mi	6.00 pCi/L	1
Elkhorn	14.7 mi	5.00 pCi/L	1
Fontana	15.6 mi	4.50 pCi/L	2
Williams Bay	15.7 mi	12.00 pCi/L	1
Lake Geneva	19.7 mi	5.00 pCi/L	1
Genoa City	26.0 mi	10.00 pCi/L	1
Burlington	28.2 mi	7.00 pCi/L	1

Rock County Radon Profile

The bedrock and soils beneath Rock 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 Rock County average 11.50 pCi/L across 2 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 Rock County.

Radon FAQ for Avalon, WI

What EPA Radon Zone is Avalon in?

Avalon and the 53505 zip code are in Rock 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 Avalon?

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

Radon mitigation in Avalon 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 Avalon?

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.