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 Rolette County, North Dakota
EPA puts Rolette County in Zone 1, its highest radon zone, and only 26 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
42.9%
11.1 pts below ND
- Rolette
- 42.9%
- ND
- 54.0%
35 tests, 2005 to 2014
Median result
3.2pCi/L
Below action level
- Rolette
- 3.2 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2005 to 2014
Tests reported
35
34th of 39 by tests
- Rolette
- 35
- Burleigh
- 1,312
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 ND
33 of 39
Lowest quarter
- Rolette
- 42.9%
- Billings
- 90.9%
By share, of 39 with 30+ tests
Read a result for Rolette County
Starts at Rolette County's median, 3.2 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 3.2 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. Rolette County's median reported result, 2005 to 2014.
The data
Rolette County, At a glance
Rolette County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Rolette 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 Rolette County, 2008 to 2017, laboratory
CDC holds 26 reported tests for Rolette County over the 2008 to 2017 laboratory totals, with a median of 3.4 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Rolette County beside the counties around it is how this page reads it.
What these figures count
Only 26 tests were reported to CDC for Rolette 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).
Rolette County, Compared
Rolette County radon figures, compared
Calculated by Radon411In Rolette County, about 4 in 10 reported tests over the 2005 to 2014 laboratory totals (15 of 35) were at or above EPA's action level. Against the national pool of 36.0%, the gap is 6.9 points higher. Across 53 North Dakota counties pooled together, 54.0% of tests reached that level, so Rolette County runs 11.1 points below its state.
The newest figure, over the 2008 to 2017 laboratory totals, counts only 26 tests (46.2% at or above 4 pCi/L), too few to compare, so this reading uses the 35-test figure.
Of 3 neighbours with a figure, all 3 reported a larger share at or above 4 pCi/L; the spread is 42.9% (Pierce County) to 67.3% (Bottineau County). By share, Rolette County is 33rd of 39 North Dakota counties with 30 or more tests for the same period.
Half the tests came in under 3.2 pCi/L and half over it; the single highest reached 35.3 pCi/L. Below the action level, 7 tests (20.0%) came in under 2 pCi/L, against 22.0% statewide, and 13 tests (37.1%) fell between 2 and 4, against 23.9% statewide.
Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 42.9% share point the same way here. USGS geology rates 100% of the county's land high radon potential.
CDC's ten-year totals for Rolette County went from 35 tests (2005 to 2014) to 26 (2008 to 2017), the share going from 42.9% to 46.2%.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Rolette County, Geology
The ground under Rolette County
PredictedUSGS's geologic map puts all of Rolette County's mapped land in one class: high radon potential. 96.1% of it lies in the area the map calls Great Plains (Glaciated), to which USGS gives 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 | 96.1% |
| Glacial Lakes | Silt and clay deposits derived from Cretaceous shales containing higher than average amounts of uranium. | High | 14 | 3.9% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Rolette County beside the ground around it
On high-potential ground Rolette County is close to North Dakota as a whole: 100% of its land against 98.9%. Of the 3 counties that border it, none has as large a share of high-potential ground; Pierce County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Rolette County, Local resources
Radon testing and mitigation in Rolette 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
Rolette County, Questions
Questions about radon in Rolette County
Are radon levels high in Rolette County?
Over the 2008 to 2017 laboratory totals, 46.2% of the radon tests reported to CDC for Rolette County, North Dakota were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.4 pCi/L. Of 39 North Dakota counties with 30 or more tests for the same period, 32 reported a higher share; pooled, the state comes to 54.0%.
Which counties border Rolette County?
Rolette County borders 3 counties: Towner County, Bottineau County and Pierce County.
Products
Rolette County, Products
Testing a home in Rolette County
In Rolette County, 42.9% of 35 tests reported to CDC over the 2005 to 2014 laboratory totals reached 4 pCi/L, against 54.0% pooled across North Dakota. In Zone 1 the year-round level in Rolette 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
MonitorAEGTEST
HOUND-1011 rechargeable radon detector with a screen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 6 hours
Short-term kit
Air Chek Short-Term radon test kit you hang, lab fee included
- Lab fee included
In home: 72 to 168 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Rolette County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Rolette County
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Rolette County, Bordering counties
Counties bordering Rolette County
Calculated by Radon411- Radon levels in Bottineau CountyEPA zone 1
67.3%at or above 4 pCi/L
Median 6.1 pCi/L · 101 tests · 24.4 points above Rolette County
- Radon levels in Towner CountyEPA zone 1
51.3%at or above 4 pCi/L
Median 4.9 pCi/L · 39 tests · 8.4 points above Rolette County
- Radon levels in Pierce CountyEPA zone 1
42.9%at or above 4 pCi/L
Median 3.7 pCi/L · 42 tests · 0.0 points above Rolette County
Rolette County, Cities and towns
Cities and towns in Rolette County
About 11,688 people live in Rolette County by the Census Bureau's estimate for July 1, 2025, 497 fewer than in 2020 (−4.1%). That works out to 13 people per square mile of land. No town dominates: Rolla, the largest, has 1,156 residents, 9.9% of the total. Together its 5 incorporated places hold 21.8% of those residents; the other 78.2% live outside any of them. Reported testing is thin here: 35 tests over 2005 to 2014, or 3.0 for every 1,000 residents (2025 estimate), where North Dakota as a whole comes to 8.2.
From Rolla to Mylo, CDC publishes no figure by town: each reads Rolette County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Rolla | 1,156 | −4.9% | 9.9% |
| Dunseith | 606 | −4.9% | 5.2% |
| Rolette | 462 | −4.5% | 4.0% |
| St. John | 310 | −4.0% | 2.7% |
| Mylo | 19 | −5.0% | 0.2% |
5 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).
Rolette County, Homes
Homes in Rolette County
Of Rolette County's 4,601 homes, 67% are detached houses, against 57% across North Dakota; 21% are mobile homes. Half of its homes were built before 1980, close to North Dakota's 1981: 16% date from before 1960 and 19% from 2000 or later. 65% 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 | Rolette County | North Dakota |
|---|---|---|
| Housing units | 4,601 | 374,866 |
| Detached houses | 67% | 57% |
| In buildings of 5 or more | 5% | 25% |
| Mobile homes | 21% | 7% |
| Built before 1960 | 16% | 24% |
| Built since 2000 | 19% | 31% |
| Middle year built | 1980 | 1981 |
| Owner-occupied | 65% | 63% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.