Long-term kit
RL416 long-term radon test kit, lab fee included
- Lab fee included
Method: Alpha track
In home: 90 days to 12 months
Locations and reports
Radon Levels in Red Lake County, Minnesota
EPA puts Red Lake County in Zone 1, its highest radon zone, and only 2 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
31.6%
12.5 pts below MN
- Red Lake
- 31.6%
- Minnesota
- 44.1%
57 tests, 2007 to 2016
Median result
2.7pCi/L
Below action level
- Red Lake
- 2.7 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2007 to 2016
Tests reported
57
83rd of 86 by tests
- Red Lake
- 57
- Hennepin
- 32,628
Reported to CDC before any fix, 2007 to 2016
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Rank in Minnesota
73 of 86
Lowest quarter
- Red Lake
- 31.6%
- Rock
- 84.6%
By share, of 86 with 30+ tests
Read a result for Red Lake County
Starts at Red Lake County's median, 2.7 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.7 pCi/L
Between 2 and 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is between 2 and 4 pCi/L. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. Red Lake County's median reported result, 2007 to 2016.
The data
Red Lake County, At a glance
Red Lake County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Red Lake County in
USGS geologic potential: High across 68% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Red Lake County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 33.3% |
| 2015 | 25.0% |
| 2016 | 40.0% |
| 2017 | 20.0% |
| 2018 | 50.0% |
| 2019 | 60.0% |
| 2020 | 66.7% |
| 2021 | 62.5% |
| 2022 | 40.0% |
| 2023 | 50.0% |
2023: 50.0%. Across these years the share ran from 20.0% to 66.7%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 2 tests were reported to CDC for Red Lake 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).
Red Lake County, Compared
Red Lake County radon figures, compared
Calculated by Radon411In Red Lake County, about 3 in 10 reported tests over the 2007 to 2016 laboratory totals (18 of 57) were at or above EPA's action level. Against the national pool of 35.8%, the gap is 4.2 points lower. Across 87 Minnesota counties pooled together, 44.1% of tests reached that level, so Red Lake County runs 12.5 points below its state.
The newest figure, in 2023, counts only 2 tests (50.0% at or above 4 pCi/L), too few to compare, so this reading uses the 57-test figure.
Of 2 neighbours with a figure, all 2 reported a larger share at or above 4 pCi/L; the spread is 47.2% (Pennington County) to 69.8% (Polk County). By share, Red Lake County is 73rd of 86 Minnesota counties with 30 or more tests for the same period.
Half the tests came in under 2.7 pCi/L and half over it; the single highest reached 27.7 pCi/L. Below the action level, 17 tests (29.8%) came in under 2 pCi/L, against 26.9% statewide, and 22 tests (38.6%) fell between 2 and 4, against 29.0% statewide.
Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 31.6% share point the same way here. USGS geology rates 68% of the county's land high radon potential.
The busiest year on file was 2014, with 18 tests reported; the quietest, 2023, had 2.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Red Lake County, State data
Minnesota's own radon test data
MeasuredWhat Minnesota's own agencies publish about radon tests in Red Lake 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 Red Lake 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
56.8%
21 properties tested with one or more tests at or above 4 pCi/L
Median result
4.1 pCi/L
Average result
5.2 pCi/L
Tests behind these figures
4 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.
Red Lake County, Geology
The ground under Red Lake County
PredictedUSGS's geologic map splits Red Lake County: 68.2% of its land is high radon potential and 31.8% moderate. The map puts 68.2% of Red Lake County in the area it calls Lake Agassiz Plain and 31.8% in Lake Agassiz Plain/Central Lowland-Western Lake Section. USGS gives the first a radon index of 15, 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 |
|---|---|---|---|---|
| Lake Agassiz Plain | Silt and clay deposits of Glacial Lake Agassiz derived from Cretaceous shales containing higher than average amounts of uranium. | High | 15 | 68.2% |
| Lake Agassiz Plain/Central Lowland-Western Lake Section | Silty and clayey glacial deposits and lake deposits. | Moderate | 10 | 31.8% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Red Lake County beside the ground around it
On high-potential ground Red Lake County is close to Minnesota as a whole: 68.2% of its land against 61.1%. Of the 2 counties that border it, 1 has more high-potential ground, Polk County the most at 96.5%.
The map rates the ground, not the air in any home.
Local help
Red Lake County, Local resources
Radon testing and mitigation in Red Lake 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
Red Lake County, Questions
Questions about radon in Red Lake County
Are radon levels high in Red Lake County?
In 2023, 50.0% of the radon tests reported to CDC for Red Lake County, Minnesota were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.0 pCi/L. Of 86 Minnesota counties with 30 or more tests for the same period, 72 reported a higher share; pooled, the state comes to 44.1%.
Which counties border Red Lake County?
Red Lake County borders 2 counties: Pennington County and Polk County.
Products
Red Lake County, Products
Testing a home in Red Lake County
In Red Lake County, 31.6% of 57 tests reported to CDC over the 2007 to 2016 laboratory totals reached 4 pCi/L, against 44.1% pooled across Minnesota. In Zone 1 the year-round level in Red Lake County is the one to know: a long-term test (more than 90 days) or a monitor, with a short-term kit for a first answer.
Test kits and monitors3
See every kit and monitor
Monitor
RadonPro Wi-Fi radon monitor with a built-in Geiger counter
- C-NRPP 2024/25: Not included
- Plug-in
- Wi-Fi
- Alarm
- Screen, app
First reading: Within 5 minutes
Short-term kitFirst Alert
RD1 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 2 to 4 days
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Red Lake County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Red Lake County
Explore
Red Lake County, Bordering counties
Counties bordering Red Lake County
Calculated by Radon411- Radon levels in Polk CountyEPA zone 1
69.8%at or above 4 pCi/L
Median 6.7 pCi/L · 341 tests · 38.2 points above Red Lake County
- Radon levels in Pennington CountyEPA zone 1
47.2%at or above 4 pCi/L
Median 3.3 pCi/L · 142 tests · 15.6 points above Red Lake County
Red Lake County, Cities and towns
Cities and towns in Red Lake County
Red Lake County's population has barely moved since 2020: 3,940 residents on July 1, 2025 against 3,937 then, by the Census Bureau's estimates. Spread over its land, that is 9.1 people to the square mile. Its largest town, Red Lake Falls, has 1,348 residents, 34.2% of the total. Together its 4 incorporated places hold 54.8% of those residents; the other 45.2% live outside any of them. CDC's 57 reported tests for 2007 to 2016 work out to 14.5 per 1,000 residents (2025 estimate), close to Minnesota's 20.7.
From Red Lake Falls to Brooks, CDC publishes no figure by town: each reads Red Lake County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Red Lake Falls | 1,348 | −0.1% | 34.2% |
| Oklee | 417 | +0.2% | 10.6% |
| Plummer | 278 | +0.7% | 7.1% |
| Brooks | 118 | Level | 3.0% |
4 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).
Red Lake County, Homes
Homes in Red Lake County
Red Lake County is a place of houses on their own lots: 81% of its 1,884 homes are detached single-family houses, against 66% across Minnesota. The homes are older than Minnesota's as a whole: half were built before 1969 (1978 for Minnesota), and 41% date from before 1960. 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 | Red Lake County | Minnesota |
|---|---|---|
| Housing units | 1,884 | 2,519,538 |
| Detached houses | 81% | 66% |
| In buildings of 5 or more | 5% | 19% |
| Mobile homes | 8% | 3% |
| Built before 1960 | 41% | 29% |
| Built since 2000 | 16% | 22% |
| Middle year built | 1969 | 1978 |
| Owner-occupied | 84% | 72% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.