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 Griggs County, North Dakota
EPA puts Griggs County in Zone 1, its highest radon zone, and only 11 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
54.8%
0.8 pts above ND
- Griggs
- 54.8%
- ND
- 54.0%
31 tests, 2005 to 2014
Median result
4.1pCi/L
Action level reached
- Griggs
- 4.1 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2005 to 2014
Tests reported
31
38th of 39 by tests
- Griggs
- 31
- 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
23 of 39
Middle half
- Griggs
- 54.8%
- Billings
- 90.9%
By share, of 39 with 30+ tests
Read a result for Griggs County
Starts at Griggs County's median, 4.1 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 4.1 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. Griggs County's median reported result, 2005 to 2014.
The data
Griggs County, At a glance
Griggs County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Griggs 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 Griggs County, 2008 to 2017, laboratory
CDC holds 11 reported tests for Griggs County over the 2008 to 2017 laboratory totals, with a median of 5.0 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Griggs County beside the counties around it is how this page reads it.
What these figures count
Only 11 tests were reported to CDC for Griggs 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).
Griggs County, Compared
Griggs County radon figures, compared
Calculated by Radon411More than half: 54.8% of the 31 radon tests reported to CDC for Griggs County over the 2005 to 2014 laboratory totals read at least 4 pCi/L. That places it 23rd of 39 North Dakota counties with 30 or more tests for the same period. That is 0.8 points above the 54.0% pooled from 53 North Dakota counties.
The newest figure, over the 2008 to 2017 laboratory totals, counts only 11 tests (54.5% at or above 4 pCi/L), too few to compare, so this reading uses the 31-test figure.
The median result, 4.1 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 15.6 pCi/L. The rest split 19.4% under 2 pCi/L and 25.8% from 2 to 4 (North Dakota: 22.0% and 23.9%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 54.8% share point the same way here.
2 of its 3 bordering counties with figures ran higher, led by Stutsman County at 69.7%; Nelson County reported 50.0%. Statewide for the same period, Billings County reported the highest share (90.9%) and Williams County the lowest (35.1%).
CDC's ten-year totals for Griggs County went from 31 tests (2005 to 2014) to 11 (2008 to 2017), the share going from 54.8% to 54.5%.
Nationally, every county with a figure for the same period pools to 36.0%; Griggs County sits 18.8 points above it.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Griggs County, Geology
The ground under Griggs County
PredictedUSGS's geologic map puts all of Griggs County's mapped land in one class: high radon potential. All 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 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Griggs County beside the ground around it
On high-potential ground Griggs 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; Barnes County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Griggs County, Local resources
Radon testing and mitigation in Griggs 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
Griggs County, Questions
Questions about radon in Griggs County
Are radon levels high in Griggs County?
Over the 2008 to 2017 laboratory totals, 54.5% of the radon tests reported to CDC for Griggs County, North Dakota were at or above 4 pCi/L, and the median reported pre-mitigation result was 5.0 pCi/L. Of 39 North Dakota counties with 30 or more tests for the same period, 22 reported a higher share; pooled, the state comes to 54.0%.
Which counties border Griggs County?
Griggs County borders 6 counties: Steele County, Foster County, Nelson County, Eddy County, Barnes County and Stutsman County.
Products
Griggs County, Products
Testing a home in Griggs County
In Griggs County, 54.8% of 31 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 Griggs 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
RadonEye RD200 plug-in continuous radon monitor
- C-NRPP 2024/25: Approved
- Plug-in
- Bluetooth
- Alarm
- Screen, app
Method: Ion chamber
First reading: Within 10 minutes
Short-term kit
Radon Short Term Test Kit short-term charcoal radon test kit, lab fee included
- Lab fee included
Method: Charcoal
In home: 2 to 7 days
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Griggs County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Griggs County
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Griggs County, Bordering counties
Counties bordering Griggs County
Calculated by Radon411- Radon levels in Stutsman CountyEPA zone 1
69.7%at or above 4 pCi/L
Median 5.8 pCi/L · 234 tests · 14.9 points above Griggs County
- Radon levels in Barnes CountyEPA zone 1
67.0%at or above 4 pCi/L
Median 5.5 pCi/L · 106 tests · 12.2 points above Griggs County
- Radon levels in Foster CountyEPA zone 1
50.0%at or above 4 pCi/L
Median 4.0 pCi/L · 22 tests · 4.8 points below Griggs County
- Radon levels in Nelson CountyEPA zone 1
50.0%at or above 4 pCi/L
Median 3.8 pCi/L · 34 tests · 4.8 points below Griggs County
- Radon levels in Eddy CountyEPA zone 1
29.4%at or above 4 pCi/L
Median 3.1 pCi/L · 17 tests · 25.4 points below Griggs County
- Radon levels in Steele CountyEPA zone 1
0.0%at or above 4 pCi/L
Median 1.4 pCi/L · 2 tests · 54.8 points below Griggs County
Griggs County, Cities and towns
Cities and towns in Griggs County
About 2,239 people live in Griggs County by the Census Bureau's estimate for July 1, 2025, 58 fewer than in 2020 (−2.5%). Spread over its land, that is 3.2 people to the square mile. Its largest town, Cooperstown, has 969 residents, 43.3% of the total. Together its 3 incorporated places hold 56.0% of those residents; the other 44.0% live outside any of them. Testing is reported here more often than across the state: CDC's 31 reported tests for 2005 to 2014 come to 13.8 for every 1,000 residents (2025 estimate), against 8.2 for North Dakota.
From Cooperstown to Hannaford, CDC publishes no figure by town: each reads Griggs County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Cooperstown | 969 | −2.1% | 43.3% |
| Binford | 162 | −3.0% | 7.2% |
| Hannaford | 122 | −3.2% | 5.4% |
3 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).
Griggs County, Homes
Homes in Griggs County
Griggs County is a place of houses on their own lots: 84% of its 1,353 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 1958 (1981 for North Dakota), and 53% date from before 1960. Owners live in 79% of the occupied homes (North Dakota: 63%), so for most households a test and a fix are their own to order.
| Homes | Griggs County | North Dakota |
|---|---|---|
| Housing units | 1,353 | 374,866 |
| Detached houses | 84% | 57% |
| In buildings of 5 or more | 9% | 25% |
| Mobile homes | 3% | 7% |
| Built before 1960 | 53% | 24% |
| Built since 2000 | 7% | 31% |
| Middle year built | 1958 | 1981 |
| Owner-occupied | 79% | 63% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.