Sister Bay, WI Radon Levels

Q: What EPA Radon Zone is Sister Bay in?

Sister Bay is in Door County, EPA Zone 1.

Q: How much does radon mitigation cost in Sister Bay?

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

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

Sister Bay, WI Radon Facts

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

County Door County, WI

Zip Code 54234

Positioned along Lake Michigan in Door County, Sister Bay's 54234 zip code lacks sufficient radon testing data for assessment. The area's dolomite bedrock beneath glacial soils can create pockets of elevated radon, particularly in homes with basements or lower-level living spaces. Door County residents should conduct individual testing regardless of their proximity to the lake.

5.00

pCi/L area average

Above EPA Action Level

Door County average: 5.00 pCi/L, based on 1 user-submitted test across 1 city in the county. No homeowner readings have been submitted for Sister Bay 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+

Sister Bay, 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 Sister Bay, WI

No homeowner tests have been submitted for Sister Bay 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
Ellison Bay	5.7 mi	5.00 pCi/L	1
Algoma	43.3 mi	5.00 pCi/L	1
Crivitz	47.2 mi	10.00 pCi/L	1

Door County Radon Profile

The bedrock and soils beneath Door 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 Door County average 5.00 pCi/L across 1 test — 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 Door County.

Radon FAQ for Sister Bay, WI

What EPA Radon Zone is Sister Bay in?

Sister Bay and the 54234 zip code are in Door 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 Sister Bay?

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

Radon mitigation in Sister Bay 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 Sister Bay?

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.