Williams, MN Radon Levels

Q: What EPA Radon Zone is Williams in?

Williams is in Lake of the Woods County, EPA Zone 2.

Q: How much does radon mitigation cost in Williams?

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

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

Williams, MN Radon Facts

EPA Radon Zone Zone 2 — Moderate Risk 2–4 pCi/L (Zone 2)

County Lake of the Woods County, MN

Zip Code 56686

Positioned in Lake of the Woods County near the Canadian border, Williams sits in Minnesota's northern lake country where glacial deposits over Precambrian bedrock create EPA Zone 2 conditions. Testing data for this remote 56686 community remains unavailable, making home-specific assessment valuable. The area's complex glacial geology and mix of seasonal and year-round residences can influence radon accumulation patterns in unique ways.

6.00

pCi/L area average

Above EPA Action Level

Nearby homeowner readings average 6.00 pCi/L, based on 1 test from 1 nearby city. No readings have been submitted for Williams yet, so the closest recorded data is shown as a benchmark. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Williams, MN 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 Williams, MN

No homeowner tests have been submitted for Williams 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
Roseau	36.8 mi	6.00 pCi/L	1

Lake of the Woods County Radon Profile

The soils and bedrock of Lake of the Woods County place it in EPA Radon Zone 2, a moderate-risk classification with predicted indoor averages of 2 to 4 pCi/L. Few homeowner tests have been logged inside Lake of the Woods County so far, which is why this page draws on the nearest recorded readings to illustrate regional radon levels. Since radon is the second leading cause of lung cancer nationally, the EPA urges every household in Lake of the Woods County to test, as levels can differ between neighboring homes.

Radon FAQ for Williams, MN

What EPA Radon Zone is Williams in?

Williams and the 56686 zip code are in Lake of the Woods County, which has an EPA assigned Radon Zone of 2. A zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L.

Why are radon readings shown from areas near Williams?

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

Radon mitigation in Williams 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 Williams?

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.