Short-term kit
Air Chek Short-Term radon test kit you hang, lab fee included
- Lab fee included
In home: 72 to 168 hours
Locations and reports
Radon Levels in Crook County, Oregon
EPA puts Crook County in Zone 2, its middle radon zone, and only 1 radon test from it is 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
5.4%
20.0 pts below OR
- Crook
- 5.4%
- Oregon
- 25.4%
37 tests, 2008 to 2017
Median result
0.9pCi/L
Below action level
- Crook
- 0.9 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
37
19th of 23 by tests
- Crook
- 37
- Multnomah
- 12,330
Reported to CDC before any fix, 2008 to 2017
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Rank in Oregon
20 of 23
Lowest quarter
- Crook
- 5.4%
- Union
- 42.0%
By share, of 23 with 30+ tests
Read a result for Crook County
Starts at Crook County's median, 0.9 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 0.9 pCi/L
Below 2 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is below 2 pCi/L, the level at which EPA says a fix should be considered. Crook County's median reported result, 2008 to 2017.
The data
Crook County, At a glance
Crook County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Crook County is a
USGS geologic potential: Moderate across 59% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Crook County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 0.0% |
| 2015 | 50.0% |
| 2016 | 0.0% |
| 2017 | 0.0% |
| 2018 | 0.0% |
| 2019 | 0.0% |
| 2020 | 0.0% |
| 2021 | 0.0% |
| 2022 | 0.0% |
| 2023 | 100.0% |
2023: 100.0%. Across these years the share ran from 0.0% to 100.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 1 test was reported to CDC for Crook 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).
Crook County, Compared
Crook County radon figures, compared
Calculated by Radon411Crook County reports fewer high tests than Oregon overall. 5.4% of its 37 tests over the 2008 to 2017 laboratory totals were at or above 4 pCi/L. That is 20.0 points below the 25.4% pooled from 34 Oregon counties.
The newest figure, in 2023, counts only 1 test (100.0% at or above 4 pCi/L), too few to compare, so this reading uses the 37-test figure.
Ordered from highest share down, it comes 20th of 23 Oregon counties with 30 or more tests for the same period. Nationally, every county with a figure for the same period pools to 35.7%; Crook County sits 30.3 points below it.
Deschutes County, the one bordering county with a figure for the same period, reported 3.8%. The reported tests do not follow EPA's Zone 2 label for Crook County (predicted average between 2 and 4 pCi/L): 5.4% of them reached 4 pCi/L, fewer than that label suggests.
Half the tests came in under 0.9 pCi/L and half over it; the single highest reached 6.4 pCi/L. The rest split 75.7% under 2 pCi/L and 18.9% from 2 to 4 (Oregon: 51.9% and 22.7%).
The busiest year on file was 2020, with 9 tests reported; the quietest, 2023, had 1.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Crook County, Geology
The ground under Crook County
PredictedUSGS's geologic map splits Crook County: 58.6% of its land is moderate radon potential and 41.4% low. The map puts 58.6% of Crook County in the area it calls Blue Mountains and 41.4% in High Lava Plains. USGS gives the first a radon index of 9, in the moderate band (9 to 11), and the second 7, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Blue Mountains | Tertiary basalt and andesite, tuffaceous sedimentary rocks, and tuff. | Moderate | 9 | 58.6% |
| High Lava Plains | Tertiary and Quaternary basalt flows and Tertiary silicic ash-flow tuff. | Low | 7 | 41.4% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Crook County beside the ground around it
On moderate-potential ground Crook County is close to Oregon as a whole: 58.6% of its land against 62.3%. Of the 5 counties that border it, 4 have more moderate-potential ground, Wheeler County the most at 100%.
The map rates the ground, not the air in any home.
Local help
Crook County, Local resources
Radon testing and mitigation in Crook County
- Oregon Radon Awareness ProgramOregon Radon Awareness Program, run by Oregon Health Authority, offers free or discounted test kits, and answers questions about testing and mitigation in Oregon.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
Oregon Radon Awareness Program provides a FREE short-term radon test kit to those living in areas of Oregon where little radon testing has been done.
- Compare kits
- Professionals in Oregon38 professionals are listed in Oregon.
What Oregon's program says
- Radon.program@dhsoha.state.or.us
What it means
Crook County, Questions
Questions about radon in Crook County
Are radon levels high in Crook County?
In 2023, 100.0% of the radon tests reported to CDC for Crook County, Oregon were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.8 pCi/L. Of 23 Oregon counties with 30 or more tests for the same period, 19 reported a higher share; pooled, the state comes to 25.4%.
Which counties border Crook County?
Crook County borders 5 counties: Wheeler County, Jefferson County, Deschutes County, Grant County and Harney County.
Products
Crook County, Products
Testing a home in Crook County
In Crook County, 5.4% of 37 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 25.4% pooled across Oregon. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Crook County; a long-term test tells the year-round average.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
MonitorX-Sense
XR0A-iR Wi-Fi battery radon detector with a screen
- C-NRPP 2024/25: Not included
- Battery
- Wi-Fi
- Screen, app
Method: Alpha spectrometry
First reading: Within 24 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Crook County, Bordering counties
Counties bordering Crook County
Calculated by Radon411- Radon levels in Harney CountyEPA zone 2
20.0%at or above 4 pCi/L
Median 0.7 pCi/L · 5 tests · 14.6 points above Crook County
- Radon levels in Deschutes CountyEPA zone 3
3.8%at or above 4 pCi/L
Median 0.7 pCi/L · 159 tests · 1.6 points below Crook County
- Radon levels in Wheeler CountyEPA zone 2
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 2 tests · 5.4 points below Crook County
- Radon levels in Jefferson CountyEPA zone 2
0.0%at or above 4 pCi/L
Median 0.6 pCi/L · 8 tests · 5.4 points below Crook County
- Radon levels in Grant CountyEPA zone 2
0.0%at or above 4 pCi/L
Median 1.2 pCi/L · 4 tests · 5.4 points below Crook County
Crook County, Cities and towns
Cities and towns in Crook County
Crook County is growing: the Census Bureau puts it at 27,564 residents on July 1, 2025, up 10.6% from 24,933 in 2020. Spread over its land, that is 9.3 people to the square mile. Prineville, its one incorporated place, has 11,994 residents, 43.5% of the total. Reported testing is thin here: 37 tests over 2008 to 2017, or 1.3 for every 1,000 residents (2025 estimate), where Oregon as a whole comes to 5.6.
Prineville is the one incorporated place here; CDC publishes no figure by town, so it reads Crook County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Prineville | 11,994 | +10.2% | 43.5% |
One incorporated place, 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).
Crook County, Homes
Homes in Crook County
Of Crook County's 11,524 homes, 73% are detached houses, against 63% across Oregon; 17% are mobile homes. Much of Crook County is recent building: 40% of its homes have gone up since 2000 and the middle year built is 1994, against 1980 for Oregon. Owners live in 76% of the occupied homes (Oregon: 63%), so for most households a test and a fix are their own to order.
| Homes | Crook County | Oregon |
|---|---|---|
| Housing units | 11,524 | 1,838,631 |
| Detached houses | 73% | 63% |
| In buildings of 5 or more | 4% | 17% |
| Mobile homes | 17% | 8% |
| Built before 1960 | 13% | 23% |
| Built since 2000 | 40% | 24% |
| Middle year built | 1994 | 1980 |
| Owner-occupied | 76% | 63% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.