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Radon Levels in Lake of the Woods County, Minnesota

EPA puts Lake of the Woods County in Zone 2, its middle radon zone, and only 2 radon tests from it are on file with CDC (2022). Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

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  • Share at 4+ pCi/L

    22.7%

    21.5 pts below MN

    Lake of the Woods
    22.7%
    Minnesota
    44.2%

    44 tests, 2005 to 2014

  • Median result

    1.1pCi/L

    Below action level

    Lake of the Woods
    1.1 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2005 to 2014

  • Tests reported

    44

    84th of 87 by tests

    Lake of the Woods
    44
    Hennepin
    32,450

    Reported to CDC before any fix, 2005 to 2014

  • EPA radon zone

    Zone 2

    Moderate potential

    1. 1
    2. Zone 2
    3. 3

    1 highest, 3 lowest

    EPA predicts 2 to 4 pCi/L indoors

  • Rank in Minnesota

    83 of 87

    Lowest quarter

    Lake of the Woods
    22.7%
    Rock
    85.0%

    By share, of 87 with 30+ tests

Read a result for Lake of the Woods County

Starts at Lake of the Woods County's median, 1.1 pCi/L

1.1pCi/L

EPA’s own thresholds; the figures are the area’s, never this home’s.

EPA’s reading of 1.1 pCi/L

Below 2 pCi/L

  1. Under 20 to 1.9 pCi/L
  2. 2 to 4consider a fix
  3. 4 and aboveEPA says fix it

This result is below 2 pCi/L, the level at which EPA says a fix should be considered. Lake of the Woods County's median reported result, 2005 to 2014.

Interpret this reading

The data

Lake of the Woods County, At a glance

Lake of the Woods County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Lake of the Woods County is a county: EPA's forecast for it as a whole is an average indoor of 2 to 4 pCi/L (75 to 150 Bq/m³). It describes no single address, and homes above EPA's are found in every zone, this one included.

USGS geologic potential: Moderate across 78% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Lake of the Woods County, 2022

Share of reported tests at or above 4 pCi/L, by year, Lake of the Woods County
Share of reported tests at or above 4 pCi/L, by year, Lake of the Woods County
YearShare of reported tests at or above 4 pCi/L
20140.0%
2015100.0%
20160.0%
20170.0%
20180.0%
2020100.0%
202110.0%
202250.0%

2022: 50.0%. Across these years the share ran from 0.0% to 100.0%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

Only 2 tests were reported to CDC for Lake of the Woods County over 2022, and tests are often run on homes being sold or already suspected of a problem: so few describe neither the county nor this house.

Measured: CDC tracking data. Figure above: 2022. Measured data period: 2005 to 2022 (every CDC figure on file).

How to read these figures

Lake of the Woods County, Compared

Lake of the Woods County radon figures, compared

Calculated by Radon411

Lake of the Woods County's 44 reported tests over the 2005 to 2014 laboratory totals had a middle value of 1.1 pCi/L and a maximum of 207.2 pCi/L, and 22.7% reached 4 pCi/L. Minnesota as a whole (87 Minnesota counties, pooled) comes to 44.2%: 21.5 points higher than here.

The newest figure, in 2022, counts only 2 tests (50.0% at or above 4 pCi/L), too few to compare, so this reading uses the 44-test figure.

Among its state's counties it ranks 83rd of 87 Minnesota counties with 30 or more tests for the same period. Statewide for the same period, Rock County reported the highest share (85.0%) and Anoka County the lowest (16.4%).

Below the action level, 26 tests (59.1%) came in under 2 pCi/L, against 26.4% statewide, and 8 tests (18.2%) fell between 2 and 4, against 29.3% statewide. The busiest year on file was 2021, with 10 tests reported; the quietest, 2016, had 1.

EPA's 1993 zone map puts Lake of the Woods County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 78% of the county's land moderate radon potential.

Next door, the shares run from 26.3% in Roseau County to 39.1% in Beltrami County.

Lake of the Woods County against Minnesota, the United States and nearby counties, 2005 to 2014, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Lake of the Woods County
Lake of the Woods County4422.7%1.1 pCi/LThis county
Minnesota, pooled87 counties, pooled116,16644.2%Not pooled+21.5 points
United States, pooled2,655 counties, pooled1,669,35336.0%Not pooled+13.3 points
Rock Countyhighest in the state20685.0%7.8 pCi/L+62.3 points
Anoka Countylowest in the state4,83216.4%1.8 pCi/L−6.3 points
Beltrami County, MNborders it34539.1%3.3 pCi/L+16.4 points
Koochiching County, MNborders it7429.7%2.0 pCi/L+7.0 points
Roseau County, MNborders it3826.3%2.4 pCi/L+3.6 points
Where Lake of the Woods County's reported results fell, 2005 to 2014, laboratory, beside Minnesota and the United States
ResultLake of the Woods County testsLake of the Woods County shareMinnesota shareU.S. shareAgainst Minnesota
Under 2 pCi/L2659.1%26.4%39.8%+32.7 points
2 to 4 pCi/L818.2%29.3%24.2%−11.1 points
4 pCi/L and above1022.7%44.2%36.0%−21.5 points
Lake of the Woods County ranked among the 87 Minnesota counties with 30 or more tests, by share at or above 4 pCi/L, 2005 to 2014, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Crow Wing County77 of 8782728.8%2.6 pCi/L
Wadena County78 of 8712027.5%2.6 pCi/L
Aitkin County79 of 8730627.1%2.2 pCi/L
Roseau County80 of 873826.3%2.4 pCi/L
Mille Lacs County81 of 8724725.9%2.1 pCi/L
Pine County82 of 8723124.2%2.3 pCi/L
Lake of the Woods County83 of 874422.7%1.1 pCi/L
St. Louis County84 of 873,14222.3%1.9 pCi/L
Lake County85 of 8720721.3%1.7 pCi/L
Isanti County86 of 8740117.5%2.1 pCi/L
Anoka County87 of 874,83216.4%1.8 pCi/L
Lake of the Woods County radon tests by year, against Minnesota's pooled share
YearTestsAt or above 4 pCi/LMedianHighestMinnesota, pooledChange from the row before
2022250.0%3.5 pCi/L4.8 pCi/L31.6%+40.0 points
20211010.0%2.3 pCi/L4.0 pCi/L33.1%−90.0 points
20203100.0%9.6 pCi/L10.3 pCi/L31.8%+100.0 points
201840.0%0.9 pCi/L2.3 pCi/L38.3%Level
201730.0%1.7 pCi/L3.5 pCi/L38.2%Level
201610.0%0.8 pCi/L0.8 pCi/L37.0%−100.0 points
20151100.0%5.8 pCi/L5.8 pCi/L43.6%+100.0 points
201440.0%0.6 pCi/L1.1 pCi/L42.9%First on file

Pooled shares: Radon411's sum of CDC's county counts for one period.

Lake of the Woods County, State data

Minnesota's own radon test data

Measured

What Minnesota's own agencies publish about radon tests in Lake of the Woods County, with their period. These are not CDC's figures and are never added to them.

MeasuredState figures, not CDC's

What the Minnesota Department of Health reports for Lake of the Woods County

Radon Testing (MN Public Health Data Access Portal): home radon tests reported voluntarily by private laboratories and licensed radon measurement professionals, counted by property. Period: 2016-2025.

Share with one or more tests at or above 4 pCi/L

20%

4 properties tested with one or more tests at or above 4 pCi/L

Median result

1.6 pCi/L

Average result

2.2 pCi/L

Tests behind these figures

2 properties tested a year on average

Publisher's note: MDH marks Percent of Properties Tested = 2 pCi/L as unstable.

  • MDH says these data do not include all of the radon tests conducted in Minnesota.
  • Post-mitigation tests are excluded from the averages and the median; the percentages use each property's highest test.
  • Each home is unique and can have very different results than a neighbor's home; the only way to know is to test.
  • These figures describe tests reported to the Minnesota Department of Health in this area. They count a different set of tests than CDC's figures and are not a reading of any one home.

Measured: Minnesota Department of Health data, 2016-2025.

Lake of the Woods County, Geology

The ground under Lake of the Woods County

Predicted

Most of the ground under Lake of the Woods County is one class on USGS's geologic map: 77.8% of its land is moderate radon potential, with 22.0% high. The map puts 77.8% of Lake of the Woods County in the area it calls Lake Agassiz Plain/Central Lowland-Western Lake Section and 22.0% in Lake Agassiz Plain. USGS gives the first a radon index of 10, in the moderate band (9 to 11), and the second 15, in the high band (12 to 17).

USGS's geologic areas under Lake of the Woods County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Lake Agassiz Plain/Central Lowland-Western Lake SectionSilty and clayey glacial deposits and lake deposits.Moderate1077.8%
Lake Agassiz PlainSilt and clay deposits of Glacial Lake Agassiz derived from Cretaceous shales containing higher than average amounts of uranium.High1522.0%

Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.

Lake of the Woods County beside the ground around it

Minnesota as a whole has more high-potential ground than Lake of the Woods County: 61.1% of its land, against 22.0% here. Of the 3 counties that border it, 1 has more high-potential ground, Roseau County the most at 24.5%.

Share of land by USGS radon potential: Lake of the Woods County, the 3 counties bordering it and Minnesota
AreaEPA zoneLow potentialModerate potentialHigh potential
Lake of the Woods CountyZone 2None77.8%22.0%
Roseau CountyZone 1None75.4%24.5%
Beltrami CountyZone 2None94.7%5.3%
Koochiching CountyZone 2None99.9%None
Minnesota87 counties, pooled by land areaVariesNone38.9%61.1%

The map rates the ground, not the air in any home.

Local help

Lake of the Woods County, Local resources

Radon testing and mitigation in Lake of the Woods County

What Minnesota's program says
Phone
651-201-4601
Email
health.indoorair@state.mn.us
Licensing of radon professionals
The Radon Licensing Act requires anyone who performs a radon test or radon mitigation, in a building they do not own or lease, must be licensed by MDH.
Disclosure when a home is sold or rented
The Minnesota Radon Awareness Act requires specific disclosure and education be provided to potential home buyers during residential real estate transactions in Minnesota.

What it means

Lake of the Woods County, Questions

Questions about radon in Lake of the Woods County

Are radon levels high in Lake of the Woods County?

In 2022, 50.0% of the radon tests reported to CDC for Lake of the Woods County, Minnesota were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.5 pCi/L. Of 87 Minnesota counties with 30 or more tests for the same period, 82 reported a higher share; pooled, the state comes to 44.2%.

Which counties border Lake of the Woods County?

Lake of the Woods County borders 3 counties: Roseau County, Beltrami County and Koochiching County.

Products

Lake of the Woods County, Products

Testing a home in Lake of the Woods County

In Lake of the Woods County, 22.7% of 44 tests reported to CDC over the 2005 to 2014 laboratory totals reached 4 pCi/L, against 44.2% pooled across Minnesota. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Lake of the Woods County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Lake of the Woods County homes, compared

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Lake of the Woods County, Bordering counties

Counties bordering Lake of the Woods County

Calculated by Radon411

Lake of the Woods County, Cities and towns

Cities and towns in Lake of the Woods County

Lake of the Woods County's population has barely moved since 2020: 3,770 residents on July 1, 2025 against 3,770 then, by the Census Bureau's estimates. Spread over its land, that is 2.9 people to the square mile. Its largest town, Baudette, has 924 residents, 24.5% of the total. Reported testing is thin here: 44 tests over 2005 to 2014, or 11.7 for every 1,000 residents (2025 estimate), where Minnesota as a whole comes to 19.9.

From Baudette to Roosevelt, CDC publishes no figure by town: each reads Lake of the Woods County's.

The cities and towns in Lake of the Woods County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Baudette924−4.0%24.5%
Williams156+2.0%4.1%
Rooseveltextends beyond Lake of the Woods County147−3.3%Counted whole

3 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025). A place that extends beyond Lake of the Woods County is counted whole, so it has no share.

Lake of the Woods County, Homes

Homes in Lake of the Woods County

Of Lake of the Woods County's 3,457 homes, 68% are detached houses, against 66% across Minnesota; 26% are mobile homes. Much of Lake of the Woods County is recent building: 25% of its homes have gone up since 2000 and the middle year built is 1986, against 1978 for Minnesota. Owners live in 84% of the occupied homes (Minnesota: 72%), so for most households a test and a fix are their own to order.

Homes in Lake of the Woods County, Minnesota, 2019 to 2023
HomesLake of the Woods CountyMinnesota
Housing units3,4572,519,538
Detached houses68%66%
In buildings of 5 or more5%19%
Mobile homes26%3%
Built before 196014%29%
Built since 200025%22%
Middle year built19861978
Owner-occupied84%72%

Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.