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 Grant County, Minnesota
EPA puts Grant County in Zone 1, its highest 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
63.2%
19.0 pts above MN
- Grant
- 63.2%
- Minnesota
- 44.2%
144 tests, 2005 to 2014
Median result
5.2pCi/L
Action level reached
- Grant
- 5.2 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2005 to 2014
Tests reported
144
72nd of 87 by tests
- Grant
- 144
- Hennepin
- 32,450
Reported to CDC before any fix, 2005 to 2014
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
32 of 87
Middle half
- Grant
- 63.2%
- Rock
- 85.0%
By share, of 87 with 30+ tests
Read a result for Grant County
Starts at Grant County's median, 5.2 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 5.2 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. Grant County's median reported result, 2005 to 2014.
The data
Grant County, At a glance
Grant County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Grant County in
USGS geologic potential: High across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Grant County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 50.0% |
| 2015 | 84.6% |
| 2016 | 78.9% |
| 2017 | 45.0% |
| 2018 | 66.7% |
| 2019 | 65.0% |
| 2020 | 85.7% |
| 2021 | 73.3% |
| 2022 | 47.6% |
| 2023 | 72.7% |
2023: 72.7%. Across these years the share ran from 45.0% to 85.7%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 11 tests were reported to CDC for Grant 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).
Grant County, Compared
Grant County radon figures, compared
Calculated by Radon411More than half: 63.2% of the 144 radon tests reported to CDC for Grant County over the 2005 to 2014 laboratory totals read at least 4 pCi/L. That places it 32nd of 87 Minnesota counties with 30 or more tests for the same period. That is 19.0 points above the 44.2% pooled from 87 Minnesota counties.
The newest figure, in 2023, counts only 11 tests (72.7% at or above 4 pCi/L), too few to compare, so this reading uses the 144-test figure.
The median result, 5.2 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 43.3 pCi/L. The rest split 13.2% under 2 pCi/L and 23.6% from 2 to 4 (Minnesota: 26.4% and 29.3%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 63.2% share point the same way here.
2 of its 6 bordering counties with figures ran higher, led by Traverse County at 69.4%; Wilkin County reported 37.2%. Statewide for the same period, Rock County reported the highest share (85.0%) and Anoka County the lowest (16.4%).
The busiest year on file was 2015, with 26 tests reported; the quietest, 2020, had 7.
Nationally, every county with a figure for the same period pools to 36.0%; Grant County sits 27.2 points above it. CDC also counts 10 tests taken after mitigation in Grant 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.
Grant County, State data
Minnesota's own radon test data
MeasuredWhat Minnesota's own agencies publish about radon tests in Grant 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 Grant 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
66.7%
82 properties tested with one or more tests at or above 4 pCi/L
Median result
5.7 pCi/L
Average result
6.6 pCi/L
Tests behind these figures
12 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.
Grant County, Geology
The ground under Grant County
PredictedUSGS's geologic map puts all of Grant County's mapped land in one class: high radon potential. The map puts 94.3% of Grant County in the area it calls Central Lowland-Till Prairie and 5.7% in Central Lowland-Western Lake Section. USGS gives both a radon index of 14, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Central Lowland-Till Prairie | Silty and clayey till derived from shale and sandstone. | High | 14 | 94.3% |
| Central Lowland-Western Lake Section | Sandy calcareous till derived from carbonate rocks. | High | 14 | 5.7% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Grant County beside the ground around it
Grant County has more high-potential ground than Minnesota as a whole: 100% of its land against 61.1%. Of the 6 counties that border it, none has as large a share of high-potential ground; Douglas County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Grant County, Local resources
Radon testing and mitigation in Grant County
Listed radon businesses with an address in Grant 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.
Listed radon professionals by town: Ashby
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
Grant County, Questions
Questions about radon in Grant County
Are radon levels high in Grant County?
In 2023, 72.7% of the radon tests reported to CDC for Grant County, Minnesota were at or above 4 pCi/L, and the median reported pre-mitigation result was 7.6 pCi/L. Of 87 Minnesota counties with 30 or more tests for the same period, 31 reported a higher share; pooled, the state comes to 44.2%.
Which counties border Grant County?
Grant County borders 6 counties: Stevens County, Traverse County, Douglas County, Pope County, Wilkin County and Otter Tail County.
Products
Grant County, Products
Testing a home in Grant County
In Grant County, 63.2% of 144 tests reported to CDC over the 2005 to 2014 laboratory totals reached 4 pCi/L, against 44.2% pooled across Minnesota. In Zone 1 the year-round level in Grant 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
RadonScan-Plus USB-powered radon monitor with Wi-Fi
- C-NRPP 2024/25: Not included
- Plug-in
- Wi-Fi
- Alarm
- Screen, app
First reading: Within 5 minutes
Short-term kit
RA100 short-term liquid scintillation radon test kit
- Lab fee extra
Method: Liquid scintillation
In home: 48 to 96 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Grant County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Grant County
Explore
Grant County, Bordering counties
Counties bordering Grant County
Calculated by Radon411- Radon levels in Traverse CountyEPA zone 1
69.4%at or above 4 pCi/L
Median 5.4 pCi/L · 85 tests · 6.2 points above Grant County
- Radon levels in Stevens CountyEPA zone 1
63.5%at or above 4 pCi/L
Median 5.3 pCi/L · 252 tests · 0.3 points above Grant County
- Radon levels in Douglas CountyEPA zone 1
60.7%at or above 4 pCi/L
Median 5.0 pCi/L · 1,520 tests · 2.5 points below Grant County
- Radon levels in Otter Tail CountyEPA zone 1
55.4%at or above 4 pCi/L
Median 4.4 pCi/L · 542 tests · 7.8 points below Grant County
- Radon levels in Pope CountyEPA zone 1
48.5%at or above 4 pCi/L
Median 3.9 pCi/L · 831 tests · 14.7 points below Grant County
- Radon levels in Wilkin CountyEPA zone 1
37.2%at or above 4 pCi/L
Median 3.1 pCi/L · 78 tests · 26.0 points below Grant County
Grant County, Cities and towns
Cities and towns in Grant County
Grant County's population has barely moved since 2020: 6,085 residents on July 1, 2025 against 6,093 then, by the Census Bureau's estimates. That works out to 11 people per square mile of land. Its largest town, Elbow Lake, has 1,276 residents, 21.0% of the total. Together its 7 incorporated places hold 56.3% of those residents; the other 43.7% live outside any of them. CDC's 144 reported tests for 2005 to 2014 work out to 23.7 per 1,000 residents (2025 estimate), close to Minnesota's 19.9.
From Elbow Lake to Norcross, CDC publishes no figure by town: each reads Grant County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Elbow Lake | 1,276 | −0.2% | 21.0% |
| Hoffman | 704 | +0.1% | 11.6% |
| Ashby | 474 | −0.4% | 7.8% |
| Herman | 386 | +0.3% | 6.3% |
| Barrett | 371 | Level | 6.1% |
| Wendell | 165 | Level | 2.7% |
| Norcross | 51 | Level | 0.8% |
7 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).
Grant County, Homes
Homes in Grant County
Grant County is a place of houses on their own lots: 85% of its 3,146 homes are detached single-family houses, against 66% across Minnesota. The homes are older than Minnesota's as a whole: half were built before 1964 (1978 for Minnesota), and 47% date from before 1960. Owners live in 79% of the occupied homes (Minnesota: 72%), so for most households a test and a fix are their own to order.
| Homes | Grant County | Minnesota |
|---|---|---|
| Housing units | 3,146 | 2,519,538 |
| Detached houses | 85% | 66% |
| In buildings of 5 or more | 7% | 19% |
| Mobile homes | 4% | 3% |
| Built before 1960 | 47% | 29% |
| Built since 2000 | 14% | 22% |
| Middle year built | 1964 | 1978 |
| Owner-occupied | 79% | 72% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.