Brooklyn, WI Radon Levels

Q: What EPA Radon Zone is Brooklyn in?

Brooklyn is in Green County, EPA Zone 1.

Q: How much does radon mitigation cost in Brooklyn?

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

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

Brooklyn, WI Radon Facts

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

County Green County, WI

Zip Code 53521

Brooklyn sits in Green County within Wisconsin's Zone 1 EPA radon area, where geological conditions typically produce lower radon levels but testing remains important for individual properties. Located between the Janesville and Madison metropolitan areas, this small community features primarily single-family homes with full basements characteristic of southern Wisconsin construction. While testing data is currently limited, homeowners should conduct radon measurements to establish baseline readings for their specific properties.

11.00

pCi/L area average

Above EPA Action Level

Green County average: 11.00 pCi/L, based on 3 user-submitted tests across 2 cities in the county. No homeowner readings have been submitted for Brooklyn 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+

Brooklyn, 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 Brooklyn, WI

No homeowner tests have been submitted for Brooklyn 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
Oregon	6.0 mi	12.00 pCi/L	1
Mc Farland	12.4 mi	9.00 pCi/L	1
New Glarus	13.4 mi	7.00 pCi/L	1
Verona	13.9 mi	18.00 pCi/L	1
Middleton	19.2 mi	4.00 pCi/L	1
Mount Horeb	21.3 mi	9.00 pCi/L	1
Monroe	21.3 mi	13.00 pCi/L	2
Milton	22.2 mi	11.50 pCi/L	2

Green County Radon Profile

Because of its underlying geology, Green County is mapped as EPA Radon Zone 1 — the most elevated classification — where predicted indoor screening averages exceed 4 pCi/L. Homeowner-submitted tests from 2 cities in Green County average 11.00 pCi/L across 3 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. As the second leading cause of lung cancer in the U.S., radon warrants testing in every Green County home regardless of zone or a neighbor's results.

Radon FAQ for Brooklyn, WI

What EPA Radon Zone is Brooklyn in?

Brooklyn and the 53521 zip code are in Green 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 Brooklyn?

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

Radon mitigation in Brooklyn 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 Brooklyn?

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.