Short-term kitempowerDX
Standard Radon Test short-term mail-in radon test kit
- Lab fee included
Method: Passive sampler
In home: 48 to 96 hours
Locations and reports
Radon Levels in Douglas County, Oregon
EPA puts Douglas County in Zone 3, its lowest radon zone, and 33.3% of its 33 reported radon tests (2023) were 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
33.3%
14.4 pts above OR
- Douglas
- 33.3%
- Oregon
- 18.9%
33 tests, 2023
Median result
1.8pCi/L
Below action level
- Douglas
- 1.8 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2023
Tests reported
33
12th of 14 by tests
- Douglas
- 33
- Multnomah
- 792
Reported to CDC before any fix, 2023
EPA radon zone
Zone 3
Lower potential
- 1
- 2
- Zone 3
1 highest, 3 lowest
EPA predicts under 2 pCi/L indoors
Rank in Oregon
2 of 14
Top quarter
- Douglas
- 33.3%
- Hood River
- 39.0%
By share, of 14 with 30+ tests
Read a result for Douglas County
Starts at Douglas County's median, 1.8 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 1.8 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. Douglas County's median reported result, 2023.
The data
Douglas County, At a glance
Douglas County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Douglas County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 0.0% |
| 2015 | 0.0% |
| 2016 | 12.5% |
| 2017 | 4.8% |
| 2018 | 0.0% |
| 2019 | 6.3% |
| 2020 | 12.7% |
| 2021 | 7.5% |
| 2022 | 0.0% |
| 2023 | 33.3% |
2023: 33.3%. Across these years the share ran from 0.0% to 33.3%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 33 tests reported to CDC for Douglas County over 2023, 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: 2023. Measured data period: 2005 to 2023 (every CDC figure on file).
Douglas County, Compared
Douglas County radon figures, compared
Calculated by Radon411In Douglas County, about 3 in 10 reported tests in 2023 (11 of 33) were at or above EPA's action level. Against the national pool of 33.4%, the gap is 0.1 points lower. Across 28 Oregon counties pooled together, 18.9% of tests reached that level, so Douglas County runs 14.4 points above its state.
Of 2 neighbours with a figure, none reported a larger share at or above 4 pCi/L; the spread is 15.5% (Lane County) to 16.3% (Jackson County). By share, Douglas County is 2nd of 14 Oregon counties with 30 or more tests for the same period.
Year by year, 2020 opened at 12.7% and 2023 closed at 33.3% (up 20.6 points), with 2023 the high at 33.3%. Half the tests came in under 1.8 pCi/L and half over it; the single highest reached 10.2 pCi/L. Below the action level, 17 tests (51.5%) came in under 2 pCi/L, against 59.5% statewide, and 5 tests (15.2%) fell between 2 and 4, against 21.6% statewide.
The reported tests do not follow EPA's Zone 3 label for Douglas County (predicted average under 2 pCi/L): 33.3% of them reached 4 pCi/L, more than a low-potential zone suggests. USGS geology rates 100% of the county's land low radon potential.
The busiest year on file was 2020, with 220 tests reported; the quietest, 2015, had 4.
Douglas CountyOregon, pooled
33.3% % of tests18.9% % of tests
| Year | Tests | Douglas County, at or above 4 pCi/L | Oregon, pooled |
|---|---|---|---|
| 2020 | 220 | 12.7% | 16.8% |
| 2021 | 134 | 7.5% | 16.3% |
| 2023 | 33 | 33.3% | 18.9% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Douglas County, Geology
The ground under Douglas County
PredictedUSGS's geologic map puts all of Douglas County's mapped land in one class: low radon potential. The map puts 43.4% of Douglas County in the area it calls Coast Range and 35.5% in Cascade Range, with one smaller area beside them. USGS gives both a radon index of 7, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Coast Range | Northern Coast Range is marine sedimentary rocks and Tertiary mafic volcanic rocks. Southern Coast Range is Tertiary estuarine and marine sedimentary rocks, feldspathic and micaceous. | Low | 7 | 43.4% |
| Cascade Range | Western Cascade Range is Tertiary andesite, basalt flows, and pyroclastic rocks. Eastern Cascades are late Tertiary to Quaternary basaltic and andesitic volcanic rocks. | Low | 7 | 35.5% |
| Klamath Mountains | Triassic to Jurassic metamorphic, volcanic, and sedimentary rocks with some Cretaceous intrusive igneous rocks. | Low | 7 | 20.9% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Douglas County beside the ground around it
Across Oregon 62.3% of the land is rated moderate; none of Douglas County's is. Of the 6 counties that border it, 2 have more moderate-potential ground, Klamath County the most at 71.6%.
The map rates the ground, not the air in any home.
Local help
Douglas County, Local resources
Radon testing and mitigation in Douglas 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
Douglas County, Questions
Questions about radon in Douglas County
Are radon levels high in Douglas County?
In 2023, 33.3% of the radon tests reported to CDC for Douglas County, Oregon were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.8 pCi/L. Of 14 Oregon counties with 30 or more tests for the same period, 1 reported a higher share; pooled, the state comes to 18.9%.
Which counties border Douglas County?
Douglas County borders 6 counties: Lane County, Jackson County, Coos County, Klamath County, Josephine County and Curry County.
Products
Douglas County, Products
Testing a home in Douglas County
In Douglas County, 33.3% of 33 tests reported to CDC in 2023 reached 4 pCi/L, against 18.9% pooled across Oregon. Zone 3 is the lowest label, yet homes at or above 4 pCi/L occur in every zone: a short-term kit (2 to 90 days) is the quick first check in Douglas County.
Test kits and monitors3
See every kit and monitor
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
Monitor
Corentium Home 2 battery digital radon monitor
- C-NRPP 2024/25: Not included
- Battery
- Bluetooth
- Screen, app
Method: Alpha spectrometry
Readings: Every 60 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Douglas County, Bordering counties
Counties bordering Douglas County
Calculated by Radon411- Radon levels in Coos CountyEPA zone 3
20.0%at or above 4 pCi/L
Median 1.7 pCi/L · 5 tests · 13.3 points below Douglas County
- Radon levels in Jackson CountyEPA zone 3
16.3%at or above 4 pCi/L
Median 0.7 pCi/L · 49 tests · 17.0 points below Douglas County
- Radon levels in Lane CountyEPA zone 3
15.5%at or above 4 pCi/L
Median 1.0 pCi/L · 58 tests · 17.8 points below Douglas County
- Radon levels in Klamath CountyEPA zone 2
15.4%at or above 4 pCi/L
Median 1.4 pCi/L · 13 tests · 17.9 points below Douglas County
- Radon levels in Josephine CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 2.2 pCi/L · 6 tests · 33.3 points below Douglas County
- Radon levels in Curry CountyEPA zone 3
No CDC figure for 2023; its page reads it against its own neighbours.
Douglas County, Cities and towns
Cities and towns in Douglas County
The Census Bureau estimates 111,951 residents in Douglas County for July 1, 2025, 657 more than in 2020 (+0.6%). That works out to 22 people per square mile of land. Its largest town, Roseburg, has 23,693 residents, 21.2% of the total. Together its 12 incorporated places hold 47.2% of those residents; the other 52.8% live outside any of them. Reported testing is thin here: 33 tests over 2023, or 0.3 for every 1,000 residents (2025 estimate), where Oregon as a whole comes to 0.5.
From Roseburg to Elkton, CDC publishes no figure by town: each reads Douglas County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Roseburg | 23,693 | +0.2% | 21.2% |
| Sutherlin | 8,635 | +1.3% | 7.7% |
| Winston | 5,680 | +0.5% | 5.1% |
| Reedsport | 4,271 | −1.0% | 3.8% |
| Myrtle Creek | 3,481 | +0.2% | 3.1% |
| Canyonville | 1,659 | +1.2% | 1.5% |
| Riddle | 1,218 | +0.4% | 1.1% |
| Drain | 1,190 | +0.9% | 1.1% |
| Yoncalla | 1,029 | +1.3% | 0.9% |
| Oakland | 943 | +0.7% | 0.8% |
| Glendale | 867 | +0.5% | 0.8% |
| Elkton | 183 | +1.1% | 0.2% |
12 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).
Douglas County, Homes
Homes in Douglas County
Of Douglas County's 50,257 homes, 67% are detached houses, against 63% across Oregon; 20% are mobile homes. Half of its homes were built before 1976, close to Oregon's 1980: 28% date from before 1960 and 19% from 2000 or later. 72% of occupied homes are lived in by their owner (Oregon: 63%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Douglas County | Oregon |
|---|---|---|
| Housing units | 50,257 | 1,838,631 |
| Detached houses | 67% | 63% |
| In buildings of 5 or more | 6% | 17% |
| Mobile homes | 20% | 8% |
| Built before 1960 | 28% | 23% |
| Built since 2000 | 19% | 24% |
| Middle year built | 1976 | 1980 |
| 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.