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.

Need Radon Mitigation or Testing in Beloit?

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Radon Readings Near Beloit, WI

No homeowner tests have been submitted for Beloit yet, so the closest user-submitted readings from neighboring communities are shown below. Radon varies by home — testing is the only way to know your level.

Radon Level	City	Distance	Home Age	Foundation	Submitted
7 pCi/L	Milton, WI	16.4 mi	0-20 Years	Full Basement	Jul 2021
16 pCi/L	Milton, WI	16.4 mi	0-20 Years	Full Basement	Jul 2017
6 pCi/L	Delavan, WI	23.7 mi	21-50 Years	Partial Basement	Sep 2022
5 pCi/L	Fontana, WI	26.4 mi	51-99 Years	No Basement/All Crawl Space	Oct 2017
4 pCi/L	Fontana, WI	26.4 mi	0-20 Years	Full Basement	Mar 2017
12 pCi/L	Williams Bay, WI	27.6 mi	0-20 Years	Full Basement	Oct 2017
8 pCi/L	Monroe, WI	28.3 mi	21-50 Years	Full Basement	Feb 2019
18 pCi/L	Monroe, WI	28.3 mi	51-99 Years	Partial Basement	Dec 2018

Readings are drawn from the nearest cities with submitted data. Have a result for Beloit? Submit your reading to help your neighbors.

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.

Radon Levels Near Beloit, WI

User-submitted radon levels from the cities closest to Beloit with recorded test data. Explore nearby communities to compare local readings.

City	Distance	Avg User Level	Submissions
Milton	16.4 mi	11.50 pCi/L	2
Delavan	23.7 mi	6.00 pCi/L	1