Fennimore, WI Radon Levels

Q: What EPA Radon Zone is Fennimore in?

Fennimore is in Grant County, EPA Zone 1.

Q: How much does radon mitigation cost in Fennimore?

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

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

Fennimore, WI Radon Facts

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

County Grant County, WI

Zip Code 53809

Fennimore in Grant County lies in Wisconsin's Driftless Area, where ancient sedimentary bedrock lacks the glacial deposits that typically moderate radon levels elsewhere in the state. Testing data remains limited, but the area's limestone and sandstone formations can produce elevated radon readings in homes. Residents should test their properties, particularly older homes with stone foundations common in this historic southwestern Wisconsin community.

17.00

pCi/L area average

Above EPA Action Level

Grant County average: 17.00 pCi/L, based on 1 user-submitted test across 1 city in the county. No homeowner readings have been submitted for Fennimore 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+

Fennimore, 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 Fennimore?

100% Free, No-Obligation Quotes
Matches You with State-Licensed Grant County Pros

1-800-299-3578 608-318-4941 (local) Toll-free · Mon–Fri 8am–6pm ET

Radon Readings Near Fennimore, WI

No homeowner tests have been submitted for Fennimore 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
Blue River	17.5 mi	6.00 pCi/L	1
Potosi	20.9 mi	17.00 pCi/L	1
Prairie Du Chien	23.8 mi	10.00 pCi/L	2
Spring Green	32.7 mi	4.00 pCi/L	1
Ridgeway	33.7 mi	8.00 pCi/L	1
Viroqua	40.2 mi	5.00 pCi/L	1
Blue Mounds	41.5 mi	15.00 pCi/L	1
Mount Horeb	46.2 mi	9.00 pCi/L	1

Grant County Radon Profile

Because of its underlying geology, Grant 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 1 city in Grant County average 17.00 pCi/L across 1 test — 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 Grant County home regardless of zone or a neighbor's results.

Radon FAQ for Fennimore, WI

What EPA Radon Zone is Fennimore in?

Fennimore and the 53809 zip code are in Grant 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 Fennimore?

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

Radon mitigation in Fennimore 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 Fennimore?

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.