Beloit, WI Radon Levels

Q: What EPA Radon Zone is Beloit in?

Beloit is in Rock County, EPA Zone 1.

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

No homeowner radon tests have been submitted for Beloit 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 Beloit?

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

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

Beloit, WI Radon Facts

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

County Rock County, WI

Zip Code 53511

Positioned in Rock County within the Janesville Metro area, Beloit sits near the Illinois border atop dolomite bedrock that contributes to Wisconsin's elevated radon potential. The city's diverse housing stock spans from historic 19th-century homes to modern suburban developments, many with full basements that can accumulate radon gas from underlying carbonate rocks. Given the EPA Zone 1 designation and limited testing data for zip code 53511, all residents should consider professional radon testing regardless of home age.

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 Beloit 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+

Beloit, 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 Beloit, WI

No homeowner tests have been submitted for Beloit 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	16.4 mi	11.50 pCi/L	2
Delavan	23.7 mi	6.00 pCi/L	1
Fontana	26.4 mi	4.50 pCi/L	2
Williams Bay	27.6 mi	12.00 pCi/L	1
Monroe	28.3 mi	13.00 pCi/L	2
Elkhorn	29.1 mi	5.00 pCi/L	1
Oregon	29.6 mi	12.00 pCi/L	1
Lake Geneva	32.1 mi	5.00 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 Beloit, WI

What EPA Radon Zone is Beloit in?

Beloit and the 53511 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 Beloit?

No homeowner radon tests have been submitted for Beloit 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 Beloit 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 Beloit?

Radon mitigation in Beloit 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 Beloit?

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.