Brookfield, WI Radon Levels

Q: What EPA Radon Zone is Brookfield in?

Brookfield is in Waukesha County, EPA Zone 1.

Q: How much does radon mitigation cost in Brookfield?

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

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

Brookfield, WI Radon Facts

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

County Waukesha County, WI

Zip Code 53005

Part of the Milwaukee Metro area in Waukesha County, this Brookfield community (zip code 53005) sits over glacial deposits that can contribute to radon accumulation in residential properties. While specific local testing data remains limited, the area's geological characteristics and predominantly single-family homes with full basements warrant regular radon testing. Homeowners should establish baseline readings to ensure their indoor air quality meets EPA safety standards.

6.80

pCi/L area average

Above EPA Action Level

Waukesha County average: 6.80 pCi/L, based on 5 user-submitted tests across 4 cities in the county. No homeowner readings have been submitted for Brookfield 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+

Brookfield, 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 Brookfield, WI

No homeowner tests have been submitted for Brookfield 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
Menomonee Falls	6.6 mi	6.50 pCi/L	2
Pewaukee	7.7 mi	10.00 pCi/L	1
Milwaukee	7.8 mi	10.00 pCi/L	3
Waukesha	8.8 mi	5.50 pCi/L	2
Franklin	12.6 mi	6.00 pCi/L	1
Thiensville	13.8 mi	5.00 pCi/L	1
Mequon	13.9 mi	6.00 pCi/L	1
Oak Creek	16.4 mi	8.33 pCi/L	3

Waukesha County Radon Profile

Waukesha County falls in EPA Radon Zone 1, meaning the local uranium-bearing geology is predicted to drive average indoor radon screening levels above the EPA's 4 pCi/L action threshold. Homeowner-submitted tests from 4 cities in Waukesha County average 6.80 pCi/L across 5 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. Since radon is the second leading cause of lung cancer nationally, the EPA urges every household in Waukesha County to test, as levels can differ between neighboring homes.

Radon FAQ for Brookfield, WI

What EPA Radon Zone is Brookfield in?

Brookfield and the 53005 zip code are in Waukesha 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 Brookfield?

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

Radon mitigation in Brookfield 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 Brookfield?

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.