Short-term kit
Air Chek Short-Term radon test kit you hang, lab fee included
- Lab fee included
In home: 72 to 168 hours
Locations and reports
Radon Levels in Clearwater County, Minnesota
EPA puts Clearwater County in Zone 2, its middle radon zone, and only 11 radon tests from it are on file with CDC (2023). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Share at 4+ pCi/L
51.6%
6.6 pts above MN
- Clearwater
- 51.6%
- Minnesota
- 45.0%
122 tests, 2006 to 2015
Median result
4.0pCi/L
Action level reached
- Clearwater
- 4.0 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2006 to 2015
Tests reported
122
77th of 87 by tests
- Clearwater
- 122
- Hennepin
- 31,571
Reported to CDC before any fix, 2006 to 2015
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Rank in Minnesota
49 of 87
Middle half
- Clearwater
- 51.6%
- Rock
- 85.0%
By share, of 87 with 30+ tests
Read a result for Clearwater County
Starts at Clearwater County's median, 4.0 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 4.0 pCi/L
At or above 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. Clearwater County's median reported result, 2006 to 2015.
The data
Clearwater County, At a glance
Clearwater County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Clearwater County is a
USGS geologic potential: High across 70% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Clearwater County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 60.0% |
| 2015 | 33.3% |
| 2016 | 41.7% |
| 2017 | 28.6% |
| 2018 | 58.8% |
| 2019 | 40.0% |
| 2020 | 52.0% |
| 2021 | 28.6% |
| 2022 | 57.1% |
| 2023 | 54.5% |
2023: 54.5%. Across these years the share ran from 28.6% to 60.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 11 tests were reported to CDC for Clearwater County over 2023, 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: 2023. Measured data period: 2005 to 2023 (every CDC figure on file).
Clearwater County, Compared
Clearwater County radon figures, compared
Calculated by Radon411More than half: 51.6% of the 122 radon tests reported to CDC for Clearwater County over the 2006 to 2015 laboratory totals read at least 4 pCi/L. That places it 49th of 87 Minnesota counties with 30 or more tests for the same period. That is 6.6 points above the 45.0% pooled from 87 Minnesota counties.
The newest figure, in 2023, counts only 11 tests (54.5% at or above 4 pCi/L), too few to compare, so this reading uses the 122-test figure.
The median result, 4.0 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 18.3 pCi/L. The rest split 17.2% under 2 pCi/L and 31.1% from 2 to 4 (Minnesota: 26.2% and 28.8%). The reported tests do not follow EPA's Zone 2 label for Clearwater County (predicted average between 2 and 4 pCi/L): 51.6% of them reached 4 pCi/L, fewer than that label suggests.
3 of its 6 bordering counties with figures ran higher, led by Polk County at 70.6%; Beltrami County reported 40.9%. Statewide for the same period, Rock County reported the highest share (85.0%) and Anoka County the lowest (17.1%).
The busiest year on file was 2018, with 34 tests reported; the quietest, 2022, had 7.
Nationally, every county with a figure for the same period pools to 36.3%; Clearwater County sits 15.3 points above it. CDC also counts 7 tests taken after mitigation in Clearwater County for the same period: tests in homes where a fix was already in.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Clearwater County, State data
Minnesota's own radon test data
MeasuredWhat Minnesota's own agencies publish about radon tests in Clearwater 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 Clearwater 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
43.9%
82 properties tested with one or more tests at or above 4 pCi/L
Median result
3.1 pCi/L
Average result
4.3 pCi/L
Tests behind these figures
19 properties tested a year on average
- 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.
Clearwater County, Geology
The ground under Clearwater County
PredictedUSGS's geologic map splits Clearwater County: 69.6% of its land is high radon potential and 30.4% moderate. The map puts 45.7% of Clearwater County in the area it calls Central Lowland-Western Lake Section and 30.4% in Lake Agassiz Plain/Central Lowland-Western Lake Section, with one smaller area beside them. USGS gives the first a radon index of 14, in the high band (12 to 17), and the second 10, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Central Lowland-Western Lake Section | Sandy calcareous till derived from carbonate rocks. | High | 14 | 45.7% |
| Lake Agassiz Plain/Central Lowland-Western Lake Section | Silty and clayey glacial deposits and lake deposits. | Moderate | 10 | 30.4% |
| Central Lowland-Till Prairie | Silty and clayey till derived from shale and sandstone. | High | 14 | 23.9% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Clearwater County beside the ground around it
On high-potential ground Clearwater County is close to Minnesota as a whole: 69.6% of its land against 61.1%. Of the 6 counties that border it, 4 have more high-potential ground, Becker County the most at 100%.
The map rates the ground, not the air in any home.
Local help
Clearwater County, Local resources
Radon testing and mitigation in Clearwater County
- MDH Indoor Air UnitMDH Indoor Air Unit, run by MN Dept. of Health, licenses or certifies radon professionals and states the rule for disclosing radon when a home is sold, and answers questions about testing and mitigation in Minnesota.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsAsk the program whether it has free or discounted kits, or compare kits you can buy.
- Compare kits
- Professionals in Minnesota255 professionals are listed in Minnesota.
What Minnesota's program says
- Phone
- 651-201-4601
- 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
Clearwater County, Questions
Questions about radon in Clearwater County
Are radon levels high in Clearwater County?
In 2023, 54.5% of the radon tests reported to CDC for Clearwater County, Minnesota were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.7 pCi/L. Of 87 Minnesota counties with 30 or more tests for the same period, 48 reported a higher share; pooled, the state comes to 45.0%.
Which counties border Clearwater County?
Clearwater County borders 6 counties: Mahnomen County, Beltrami County, Hubbard County, Pennington County, Becker County and Polk County.
Products
Clearwater County, Products
Testing a home in Clearwater County
In Clearwater County, 51.6% of 122 tests reported to CDC over the 2006 to 2015 laboratory totals reached 4 pCi/L, against 45.0% pooled across Minnesota. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Clearwater County; a long-term test tells the year-round average.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
MonitorX-Sense
XR0A-iR Wi-Fi battery radon detector with a screen
- C-NRPP 2024/25: Not included
- Battery
- Wi-Fi
- Screen, app
Method: Alpha spectrometry
First reading: Within 24 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Clearwater County, Bordering counties
Counties bordering Clearwater County
Calculated by Radon411- Radon levels in Polk CountyEPA zone 1
70.6%at or above 4 pCi/L
Median 6.7 pCi/L · 320 tests · 19.0 points above Clearwater County
- Radon levels in Mahnomen CountyEPA zone 1
68.4%at or above 4 pCi/L
Median 5.0 pCi/L · 38 tests · 16.8 points above Clearwater County
- Radon levels in Pennington CountyEPA zone 1
52.1%at or above 4 pCi/L
Median 4.0 pCi/L · 121 tests · 0.5 points above Clearwater County
- Radon levels in Becker CountyEPA zone 1
50.7%at or above 4 pCi/L
Median 4.0 pCi/L · 290 tests · 0.9 points below Clearwater County
- Radon levels in Hubbard CountyEPA zone 1
47.1%at or above 4 pCi/L
Median 3.7 pCi/L · 208 tests · 4.5 points below Clearwater County
- Radon levels in Beltrami CountyEPA zone 2
40.9%at or above 4 pCi/L
Median 3.3 pCi/L · 347 tests · 10.7 points below Clearwater County
Clearwater County, Cities and towns
Cities and towns in Clearwater County
The Census Bureau estimates 8,647 residents in Clearwater County for July 1, 2025, 82 more than in 2020 (+1.0%). Spread over its land, that is 8.7 people to the square mile. No town dominates: Bagley, the largest, has 1,310 residents, 15.1% of the total. Together its 5 incorporated places hold 25.8% of those residents; the other 74.2% live outside any of them. CDC's 122 reported tests for 2006 to 2015 work out to 14.1 per 1,000 residents (2025 estimate), close to Minnesota's 19.6.
From Bagley to Leonard, CDC publishes no figure by town: each reads Clearwater County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Bagley | 1,310 | +2.0% | 15.1% |
| Clearbrook | 469 | +0.6% | 5.4% |
| Gonvick | 272 | +0.4% | 3.1% |
| Shevlin | 138 | Level | 1.6% |
| Leonard | 39 | Level | 0.5% |
5 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).
Clearwater County, Homes
Homes in Clearwater County
Clearwater County is a place of houses on their own lots: 78% of its 4,449 homes are detached single-family houses, against 66% across Minnesota. Half of its homes were built before 1980, close to Minnesota's 1978: 26% date from before 1960 and 23% from 2000 or later. Owners live in 81% of the occupied homes (Minnesota: 72%), so for most households a test and a fix are their own to order.
| Homes | Clearwater County | Minnesota |
|---|---|---|
| Housing units | 4,449 | 2,519,538 |
| Detached houses | 78% | 66% |
| In buildings of 5 or more | 7% | 19% |
| Mobile homes | 13% | 3% |
| Built before 1960 | 26% | 29% |
| Built since 2000 | 23% | 22% |
| Middle year built | 1980 | 1978 |
| Owner-occupied | 81% | 72% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.