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 Dunn County, North Dakota
EPA puts Dunn County in Zone 1, its highest radon zone, and high results are common there: 74.3% of the 35 radon tests reported to CDC (2008 to 2017, laboratory totals) came back at or above 4 pCi/L. Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Share at 4+ pCi/L
74.3%
15.0 pts above ND
- Dunn
- 74.3%
- ND
- 59.3%
35 tests, 2008 to 2017
Median result
7.1pCi/L
Action level reached
- Dunn
- 7.1 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
35
25th of 29 by tests
- Dunn
- 35
- Burleigh
- 1,558
Reported to CDC before any fix, 2008 to 2017
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
6 of 29
Top quarter
- Dunn
- 74.3%
- Pembina
- 82.5%
By share, of 29 with 30+ tests
Read a result for Dunn County
Starts at Dunn County's median, 7.1 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 7.1 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. Dunn County's median reported result, 2008 to 2017.
The data
Dunn County, At a glance
Dunn County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Dunn 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 Dunn County, 2008 to 2017, laboratory
Under 2 pCi/L: 3%2 to 4 pCi/L: 23%4 pCi/L and above: 74%
Of 35 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 1 | 2.9% |
| 2 to 4 pCi/L | 8 | 22.9% |
| 4 pCi/L and above | 26 | 74.3% |
What these figures count
These are the 35 tests reported to CDC for Dunn County over 2008 to 2017 (laboratory totals), many from homes being sold or already suspected of a problem: they describe the county's reported tests, not this house.
Measured: CDC tracking data. Figure above: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).
Dunn County, Compared
Dunn County radon figures, compared
Calculated by Radon411More than half: 74.3% of the 35 radon tests reported to CDC for Dunn County over the 2008 to 2017 laboratory totals read at least 4 pCi/L. That places it 6th of 29 North Dakota counties with 30 or more tests for the same period. That is 15.0 points above the 59.3% pooled from 53 North Dakota counties.
The median result, 7.1 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 32.8 pCi/L. The rest split 2.9% under 2 pCi/L and 22.9% from 2 to 4 (North Dakota: 18.3% and 22.4%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 74.3% share point the same way here.
No bordering county with a figure for the same period reported a higher share; the closest is Mountrail County at 66.7%, the lowest McKenzie County at 56.1%. Statewide for the same period, Pembina County reported the highest share (82.5%) and Williams County the lowest (33.8%).
CDC's ten-year totals for Dunn County went from 54 tests (2005 to 2014) to 35 (2008 to 2017), the share going from 77.8% to 74.3%.
Nationally, every county with a figure for the same period pools to 35.7%; Dunn County sits 38.6 points above it.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Dunn County, Geology
The ground under Dunn County
PredictedUSGS's geologic map puts all of Dunn County's mapped land in one class: high radon potential. The map puts 68.3% of Dunn County in the area it calls Great Plains (Glaciated) and 31.7% in Great Plains (Unglaciated). 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 | 68.3% |
| Great Plains (Unglaciated) | Tertiary and Upper Cretaceous sandstones, shales, and locally, coal-bearing units. | High | 13 | 31.7% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Dunn County beside the ground around it
On high-potential ground Dunn County is close to North Dakota as a whole: 100% of its land against 98.9%. Of the 6 counties that border it, none has as large a share of high-potential ground; Billings County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Dunn County, Local resources
Radon testing and mitigation in Dunn 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
Dunn County, Questions
Questions about radon in Dunn County
Are radon levels high in Dunn County?
Over the 2008 to 2017 laboratory totals, 74.3% of the radon tests reported to CDC for Dunn County, North Dakota were at or above 4 pCi/L, and the median reported pre-mitigation result was 7.1 pCi/L. Of 29 North Dakota counties with 30 or more tests for the same period, 5 reported a higher share; pooled, the state comes to 59.3%.
Which counties border Dunn County?
Dunn County borders 6 counties: McKenzie County, Stark County, Mercer County, Mountrail County, Billings County and McLean County.
Products
Dunn County, Products
Testing a home in Dunn County
In Dunn County, 74.3% of 35 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 59.3% pooled across North Dakota. In Zone 1 the year-round level in Dunn 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
RM-65 rechargeable radon detector with a color screen and alarm
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 6 hours
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
Dunn County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Dunn County
Explore
Dunn County, Bordering counties
Counties bordering Dunn County
Calculated by Radon411- Radon levels in Billings CountyEPA zone 1
85.0%at or above 4 pCi/L
Median 11.0 pCi/L · 20 tests · 10.7 points above Dunn County
- Radon levels in Mountrail CountyEPA zone 1
66.7%at or above 4 pCi/L
Median 7.3 pCi/L · 48 tests · 7.6 points below Dunn County
- Radon levels in Mercer CountyEPA zone 1
63.5%at or above 4 pCi/L
Median 5.7 pCi/L · 85 tests · 10.8 points below Dunn County
- Radon levels in McLean CountyEPA zone 1
63.2%at or above 4 pCi/L
Median 5.6 pCi/L · 95 tests · 11.1 points below Dunn County
- Radon levels in Stark CountyEPA zone 1
62.4%at or above 4 pCi/L
Median 5.1 pCi/L · 386 tests · 11.9 points below Dunn County
- Radon levels in McKenzie CountyEPA zone 1
56.1%at or above 4 pCi/L
Median 4.8 pCi/L · 41 tests · 18.2 points below Dunn County
Dunn County, Cities and towns
Cities and towns in Dunn County
About 4,058 people live in Dunn County by the Census Bureau's estimate for July 1, 2025, 35 fewer than in 2020 (−0.9%). Spread over its land, that is 2.0 people to the square mile. Its largest town, Killdeer, has 912 residents, 22.5% of the total. Together its 4 incorporated places hold 36.1% of those residents; the other 63.9% live outside any of them. CDC's 35 reported tests for 2008 to 2017 work out to 8.6 per 1,000 residents (2025 estimate), close to North Dakota's 8.3.
From Killdeer to Dodge, CDC publishes no figure by town: each reads Dunn County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Killdeer | 912 | −2.5% | 22.5% |
| Dunn Center | 235 | +2.6% | 5.8% |
| Halliday | 231 | −2.5% | 5.7% |
| Dodge | 86 | −1.1% | 2.1% |
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).
Dunn County, Homes
Homes in Dunn County
Of Dunn County's 2,116 homes, 65% are detached houses, against 57% across North Dakota; 26% are mobile homes. Half of its homes were built before 1981, close to North Dakota's 1981: 27% date from before 1960 and 31% from 2000 or later. 72% of occupied homes are lived in by their owner (North Dakota: 63%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Dunn County | North Dakota |
|---|---|---|
| Housing units | 2,116 | 374,866 |
| Detached houses | 65% | 57% |
| In buildings of 5 or more | 6% | 25% |
| Mobile homes | 26% | 7% |
| Built before 1960 | 27% | 24% |
| Built since 2000 | 31% | 31% |
| Middle year built | 1981 | 1981 |
| Owner-occupied | 72% | 63% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.