Short-term kit
Radon Short Term Test Kit short-term charcoal radon test kit, lab fee included
- Lab fee included
Method: Charcoal
In home: 2 to 7 days
Locations and reports
Radon Levels in Koochiching County, Minnesota
EPA puts Koochiching County in Zone 2, its middle radon zone, and only 4 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
24.3%
19.1 pts below MN
- Koochiching
- 24.3%
- Minnesota
- 43.4%
144 tests, 2008 to 2017
Median result
1.6pCi/L
Below action level
- Koochiching
- 1.6 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
144
75th of 85 by tests
- Koochiching
- 144
- Hennepin
- 35,213
Reported to CDC before any fix, 2008 to 2017
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
80 of 85
Lowest quarter
- Koochiching
- 24.3%
- Rock
- 83.8%
By share, of 85 with 30+ tests
Read a result for Koochiching County
Starts at Koochiching County's median, 1.6 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 1.6 pCi/L
Below 2 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is below 2 pCi/L, the level at which EPA says a fix should be considered. Koochiching County's median reported result, 2008 to 2017.
The data
Koochiching County, At a glance
Koochiching County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Koochiching County is a
USGS geologic potential: Moderate across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Koochiching County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 29.3% |
| 2015 | 36.5% |
| 2016 | 17.1% |
| 2017 | 25.0% |
| 2018 | 16.7% |
| 2019 | 41.7% |
| 2020 | 14.3% |
| 2021 | 8.3% |
| 2022 | 27.3% |
| 2023 | 50.0% |
2023: 50.0%. Across these years the share ran from 8.3% to 50.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 4 tests were reported to CDC for Koochiching 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).
Koochiching County, Compared
Koochiching County radon figures, compared
Calculated by Radon411Koochiching County's 144 reported tests over the 2008 to 2017 laboratory totals had a middle value of 1.6 pCi/L and a maximum of 19.8 pCi/L, and 24.3% reached 4 pCi/L. Minnesota as a whole (87 Minnesota counties, pooled) comes to 43.4%: 19.1 points higher than here.
The newest figure, in 2023, counts only 4 tests (50.0% at or above 4 pCi/L), too few to compare, so this reading uses the 144-test figure.
Among its state's counties it ranks 80th of 85 Minnesota counties with 30 or more tests for the same period. Statewide for the same period, Rock County reported the highest share (83.8%) and Anoka County the lowest (17.4%).
Below the action level, 78 tests (54.2%) came in under 2 pCi/L, against 27.4% statewide, and 31 tests (21.5%) fell between 2 and 4, against 29.2% statewide. The busiest year on file was 2015, with 85 tests reported; the quietest, 2023, had 4.
EPA's 1993 zone map puts Koochiching County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land moderate radon potential.
Next door, the shares run from 23.7% in St. Louis County to 41.9% in Beltrami County, with St. Louis County below Koochiching County. Over 4 years of annual figures the share fell 4.3 points, from 29.3% in 2014 to 25.0% in 2017; its peak was 36.5% in 2015.
Koochiching CountyMinnesota, pooled
25.0% % of tests38.2% % of tests
| Year | Tests | Koochiching County, at or above 4 pCi/L | Minnesota, pooled |
|---|---|---|---|
| 2014 | 41 | 29.3% | 42.9% |
| 2015 | 85 | 36.5% | 43.6% |
| 2016 | 35 | 17.1% | 37.0% |
| 2017 | 36 | 25.0% | 38.2% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Koochiching County, State data
Minnesota's own radon test data
MeasuredWhat Minnesota's own agencies publish about radon tests in Koochiching 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 Koochiching 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
28.4%
42 properties tested with one or more tests at or above 4 pCi/L
Median result
2.1 pCi/L
Average result
2.9 pCi/L
Tests behind these figures
15 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.
Koochiching County, Geology
The ground under Koochiching County
PredictedUSGS's geologic map puts all of Koochiching County's mapped land in one class: moderate radon potential. All of it lies in the area the map calls Lake Agassiz Plain/Central Lowland-Western Lake Section, to which USGS gives a radon index of 10, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Lake Agassiz Plain/Central Lowland-Western Lake Section | Silty and clayey glacial deposits and lake deposits. | Moderate | 10 | 99.9% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Koochiching County beside the ground around it
Across Minnesota 61.1% of the land is rated high; none of Koochiching County's is. Of the 4 counties that border it, 2 have more high-potential ground, Lake of the Woods County the most at 22.0%.
The map rates the ground, not the air in any home.
Local help
Koochiching County, Local resources
Radon testing and mitigation in Koochiching 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
Koochiching County, Questions
Questions about radon in Koochiching County
Are radon levels high in Koochiching County?
In 2023, 50.0% of the radon tests reported to CDC for Koochiching County, Minnesota were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.9 pCi/L. Of 85 Minnesota counties with 30 or more tests for the same period, 79 reported a higher share; pooled, the state comes to 43.4%.
Which counties border Koochiching County?
Koochiching County borders 4 counties: Beltrami County, Itasca County, Lake of the Woods County and St. Louis County.
Products
Koochiching County, Products
Testing a home in Koochiching County
In Koochiching County, 24.3% of 144 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 43.4% pooled across Minnesota. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Koochiching 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
Monitor
Corentium Home battery digital radon detector
- C-NRPP 2024/25: Approved
- Battery
- Screen
Method: Alpha spectrometry
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Koochiching County, Bordering counties
Counties bordering Koochiching County
Calculated by Radon411- Radon levels in Beltrami CountyEPA zone 2
41.9%at or above 4 pCi/L
Median 3.4 pCi/L · 580 tests · 17.6 points above Koochiching County
- Radon levels in Itasca CountyEPA zone 2
34.5%at or above 4 pCi/L
Median 2.8 pCi/L · 936 tests · 10.2 points above Koochiching County
- Radon levels in St. Louis CountyEPA zone 2
23.7%at or above 4 pCi/L
Median 2.0 pCi/L · 4,608 tests · 0.6 points below Koochiching County
- Radon levels in Lake of the Woods CountyEPA zone 2
14.3%at or above 4 pCi/L
Median 2.5 pCi/L · 7 tests · 10.0 points below Koochiching County
Koochiching County, Cities and towns
Cities and towns in Koochiching County
About 11,587 people live in Koochiching County by the Census Bureau's estimate for July 1, 2025, 440 fewer than in 2020 (−3.7%). Spread over its land, that is 3.7 people to the square mile. Its largest town, International Falls, has 5,481 residents, 47.3% of the total. Together its 6 incorporated places hold 59.8% of those residents; the other 40.2% live outside any of them. Reported testing is thin here: 144 tests over 2008 to 2017, or 12.4 for every 1,000 residents (2025 estimate), where Minnesota as a whole comes to 22.5.
From International Falls to Mizpah, CDC publishes no figure by town: each reads Koochiching County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| International Falls | 5,481 | −5.2% | 47.3% |
| Ranier | 541 | −5.1% | 4.7% |
| Littlefork | 530 | −4.7% | 4.6% |
| Big Falls | 170 | −4.0% | 1.5% |
| Northome | 155 | −1.9% | 1.3% |
| Mizpah | 51 | −1.9% | 0.4% |
6 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).
Koochiching County, Homes
Homes in Koochiching County
Koochiching County is a place of houses on their own lots: 82% of its 7,418 homes are detached single-family houses, against 66% across Minnesota. Half of its homes were built before 1973, close to Minnesota's 1978: 32% date from before 1960 and 14% from 2000 or later. Owners live in 82% of the occupied homes (Minnesota: 72%), so for most households a test and a fix are their own to order.
| Homes | Koochiching County | Minnesota |
|---|---|---|
| Housing units | 7,418 | 2,519,538 |
| Detached houses | 82% | 66% |
| In buildings of 5 or more | 6% | 19% |
| Mobile homes | 8% | 3% |
| Built before 1960 | 32% | 29% |
| Built since 2000 | 14% | 22% |
| Middle year built | 1973 | 1978 |
| Owner-occupied | 82% | 72% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.