Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
Locations and reports
Radon Levels in Grant County, North Dakota
EPA puts Grant County in Zone 1, its highest radon zone, and only 23 radon tests from it are on file with CDC (2008 to 2017, laboratory totals). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Share at 4+ pCi/L
73.3%
14.6 pts above ND
- Grant
- 73.3%
- ND
- 58.7%
30 tests, 2007 to 2016
Median result
8.8pCi/L
Action level reached
- Grant
- 8.8 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2007 to 2016
Tests reported
30
31st of 35 by tests
- Grant
- 30
- Burleigh
- 1,447
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 ND
8 of 35
Top quarter
- Grant
- 73.3%
- Pembina
- 82.8%
By share, of 35 with 30+ tests
Read a result for Grant County
Starts at Grant County's median, 8.8 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 8.8 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, 2007 to 2016.
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 97% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Grant County, 2008 to 2017, laboratory
CDC holds 23 reported tests for Grant County over the 2008 to 2017 laboratory totals, with a median of 7.4 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Grant County beside the counties around it is how this page reads it.
What these figures count
Only 23 tests were reported to CDC for Grant County over 2008 to 2017 (laboratory totals), 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: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).
Grant County, Compared
Grant County radon figures, compared
Calculated by Radon411More than half: 73.3% of the 30 radon tests reported to CDC for Grant County over the 2007 to 2016 laboratory totals read at least 4 pCi/L. That places it 8th of 35 North Dakota counties with 30 or more tests for the same period. That is 14.6 points above the 58.7% pooled from 53 North Dakota counties.
The newest figure, over the 2008 to 2017 laboratory totals, counts only 23 tests (73.9% at or above 4 pCi/L), too few to compare, so this reading uses the 30-test figure.
The median result, 8.8 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 24.4 pCi/L. The rest split 13.3% under 2 pCi/L and 13.3% from 2 to 4 (North Dakota: 18.7% and 22.6%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 73.3% share point the same way here.
No bordering county with a figure for the same period reported a higher share; the closest is Stark County at 62.8%, the lowest Morton County at 52.4%. Statewide for the same period, Pembina County reported the highest share (82.8%) and Williams County the lowest (37.2%).
CDC's ten-year totals for Grant County went from 30 tests (2005 to 2014) to 23 (2008 to 2017), the share going from 66.7% to 73.9%.
Nationally, every county with a figure for the same period pools to 35.8%; Grant County sits 37.5 points above it.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Grant County, Geology
The ground under Grant County
PredictedMost of the ground under Grant County is one class on USGS's geologic map: 96.6% of its land is high radon potential, with 3.4% moderate. The map puts 52.0% of Grant County in the area it calls Great Plains (Glaciated) and 44.7% in Great Plains (Unglaciated), with one smaller area beside them. USGS gives both a radon index of 13, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Great Plains (Glaciated) | Glacial deposits derived from Cretaceous shales containing higher than average amounts of uranium. | High | 13 | 52.0% |
| Great Plains (Unglaciated) | Tertiary and Upper Cretaceous sandstones, shales, and locally, coal-bearing units. | High | 13 | 44.7% |
| Pierre Hills | Pierre Shale and Fox Hills sandstone. | Moderate | 10 | 3.4% |
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
On high-potential ground Grant County is close to North Dakota as a whole: 96.6% of its land against 98.9%. Of the 5 counties that border it, 4 have more high-potential ground, Adams County the most 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
- North Dakota's radon programNorth Dakota Department of Environmental QualityNorth Dakota's radon program offers free or discounted test kits, and answers questions about testing and mitigation in North Dakota.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
Notice: The DEQ is out of free radon test kits.
- Compare kits
- Professionals in North Dakota47 professionals are listed in North Dakota.
What North Dakota's program says
- Phone
- 701-328-5166
- jOtto@nd.gov
What it means
Grant County, Questions
Questions about radon in Grant County
Are radon levels high in Grant County?
Over the 2008 to 2017 laboratory totals, 73.9% of the radon tests reported to CDC for Grant County, North Dakota were at or above 4 pCi/L, and the median reported pre-mitigation result was 7.4 pCi/L. Of 35 North Dakota counties with 30 or more tests for the same period, 7 reported a higher share; pooled, the state comes to 58.7%.
Which counties border Grant County?
Grant County borders 5 counties: Morton County, Sioux County, Hettinger County, Adams County and Stark County.
Products
Grant County, Products
Testing a home in Grant County
In Grant County, 73.3% of 30 tests reported to CDC over the 2007 to 2016 laboratory totals reached 4 pCi/L, against 58.7% pooled across North Dakota. 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
EcoQube Flex battery digital radon monitor with an e-ink screen
- C-NRPP 2024/25: Not included
- Battery
- Bluetooth
- Alarm
- Screen, app
Method: Ion chamber
First reading: Within 15 minutes
Short-term kit
PicoCan short-term charcoal canister radon test
- Lab fee included
Method: Charcoal
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 Sioux CountyEPA zone 1
100.0%at or above 4 pCi/L
Median 9.3 pCi/L · 2 tests · 26.7 points above Grant County
- Radon levels in Adams CountyEPA zone 1
93.3%at or above 4 pCi/L
Median 8.2 pCi/L · 15 tests · 20.0 points above Grant County
- Radon levels in Hettinger CountyEPA zone 1
63.6%at or above 4 pCi/L
Median 6.2 pCi/L · 22 tests · 9.7 points below Grant County
- Radon levels in Stark CountyEPA zone 1
62.8%at or above 4 pCi/L
Median 5.1 pCi/L · 398 tests · 10.5 points below Grant County
- Radon levels in Morton CountyEPA zone 1
52.4%at or above 4 pCi/L
Median 4.1 pCi/L · 269 tests · 20.9 points below Grant County
Grant County, Cities and towns
Cities and towns in Grant County
About 2,206 people live in Grant County by the Census Bureau's estimate for July 1, 2025, 79 fewer than in 2020 (−3.5%). Spread over its land, that is 1.3 people to the square mile. Its largest town, Elgin, has 516 residents, 23.4% of the total. Together its 4 incorporated places hold 44.9% of those residents; the other 55.1% live outside any of them. Testing is reported here more often than across the state: CDC's 30 reported tests for 2007 to 2016 come to 13.6 for every 1,000 residents (2025 estimate), against 8.4 for North Dakota.
From Elgin to Leith, CDC publishes no figure by town: each reads Grant County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Elgin | 516 | −4.6% | 23.4% |
| Carson | 241 | −4.4% | 10.9% |
| New Leipzig | 206 | −4.2% | 9.3% |
| Leith | 27 | −3.6% | 1.2% |
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).
Grant County, Homes
Homes in Grant County
Grant County is a place of houses on their own lots: 75% of its 1,642 homes are detached single-family houses, against 57% across North Dakota. The homes are older than North Dakota's as a whole: half were built before 1960 (1981 for North Dakota), and 50% date from before 1960. Owners live in 84% of the occupied homes (North Dakota: 63%), so for most households a test and a fix are their own to order.
| Homes | Grant County | North Dakota |
|---|---|---|
| Housing units | 1,642 | 374,866 |
| Detached houses | 75% | 57% |
| In buildings of 5 or more | 5% | 25% |
| Mobile homes | 17% | 7% |
| Built before 1960 | 50% | 24% |
| Built since 2000 | 7% | 31% |
| Middle year built | 1960 | 1981 |
| Owner-occupied | 84% | 63% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.