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
Locations and reports
Radon Levels in Washington County, Oklahoma
EPA puts Washington County in Zone 3, its lowest radon zone, and only 23 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
11.3%
1.3 pts below OK
- Washington
- 11.3%
- Oklahoma
- 12.6%
53 tests, 2006 to 2015
Median result
1.9pCi/L
Below action level
- Washington
- 1.9 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2006 to 2015
Tests reported
53
3rd of 5 by tests
- Washington
- 53
- Tulsa
- 300
Reported to CDC before any fix, 2006 to 2015
EPA radon zone
Zone 3
Lower potential
- 1
- 2
- Zone 3
1 highest, 3 lowest
EPA predicts under 2 pCi/L indoors
Rank in Oklahoma
3 of 5
Middle half
- Washington
- 11.3%
- Delaware
- 44.7%
By share, of 5 with 30+ tests
Read a result for Washington County
Starts at Washington County's median, 1.9 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 1.9 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. Washington County's median reported result, 2006 to 2015.
The data
Washington County, At a glance
Washington 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 Washington County, 2008 to 2017, laboratory
CDC holds 23 reported tests for Washington County over the 2008 to 2017 laboratory totals, with a median of 1.6 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Washington County beside the counties around it is how this page reads it.
What these figures count
Only 23 tests were reported to CDC for Washington 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).
Washington County, Compared
Washington County radon figures, compared
Calculated by Radon411Washington County reports fewer high tests than Oklahoma overall. 11.3% of its 53 tests over the 2006 to 2015 laboratory totals were at or above 4 pCi/L. That is 1.3 points below the 12.6% pooled from 53 Oklahoma counties.
The newest figure, over the 2008 to 2017 laboratory totals, counts only 23 tests (4.3% at or above 4 pCi/L), too few to compare, so this reading uses the 53-test figure.
Ordered from highest share down, it comes 3rd of 5 Oklahoma counties with 30 or more tests for the same period. Nationally, every county with a figure for the same period pools to 36.3%; Washington County sits 25.0 points below it.
Tulsa County, the one bordering county with a figure for the same period, reported 6.0%. Zone 3 on EPA's map (predicted average under 2 pCi/L) and a 11.3% share point the same way here.
Half the tests came in under 1.9 pCi/L and half over it; the single highest reached 10.0 pCi/L. The rest split 50.9% under 2 pCi/L and 37.7% from 2 to 4 (Oklahoma: 69.0% and 18.5%).
CDC's ten-year totals for Washington County went from 52 tests (2005 to 2014) to 23 (2008 to 2017), the share going from 9.6% to 4.3%.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Washington County, Geology
The ground under Washington County
PredictedUSGS's geologic map puts all of Washington County's mapped land in one class: low radon potential. All of it lies in the area the map calls Central Oklahoma Plains and Hills, to which USGS gives 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 |
|---|---|---|---|---|
| Central Oklahoma Plains and Hills | Nonmarine Permian and Tertiary rocks, including shale, sandstone, and conglomerate in the western part, and Mississippian and Pennsylvanian rocks in the eastern part. | Low | 7 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Washington County beside the ground around it
Across Oklahoma 0.6% of the land is rated high; none of Washington County's is. Of the 6 counties that border it, 2 have more moderate-potential ground, Montgomery County, KS the most at 99.7%.
The map rates the ground, not the air in any home.
Local help
Washington County, Local resources
Radon testing and mitigation in Washington County
- Oklahoma's radon programDepartment of Environmental QualityOklahoma's radon program answers questions about testing, mitigation and the rules in Oklahoma.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsAsk the program whether it has free or discounted kits, or compare kits you can buy.
- Compare kits
- See the Oklahoma directoryNo professionals are listed in Oklahoma yet. The state program can point you to registered testers and mitigators.
What it means
Washington County, Questions
Questions about radon in Washington County
Are radon levels high in Washington County?
Over the 2008 to 2017 laboratory totals, 4.3% of the radon tests reported to CDC for Washington County, Oklahoma were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.6 pCi/L. Of 5 Oklahoma counties with 30 or more tests for the same period, 2 reported a higher share; pooled, the state comes to 12.6%.
Which counties border Washington County?
Washington County borders 6 counties: Nowata County, OK, Montgomery County, KS, Chautauqua County, KS, Osage County, OK, Rogers County, OK and Tulsa County, OK.
Products
Washington County, Products
Testing a home in Washington County
In Washington County, 11.3% of 53 tests reported to CDC over the 2006 to 2015 laboratory totals reached 4 pCi/L, against 12.6% pooled across Oklahoma. 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 Washington County.
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
MonitorINKBIRD
INK-RD3 battery radon monitor with an e-ink screen
- C-NRPP 2024/25: Not included
- Battery
- Screen
First reading: Within 24 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Washington County, Bordering counties
Counties bordering Washington County
Calculated by Radon411- Radon levels in Rogers County, OKEPA zone 3
11.8%at or above 4 pCi/L
Median 0.6 pCi/L · 17 tests · 0.5 points above Washington County
- Radon levels in Tulsa County, OKEPA zone 3
6.0%at or above 4 pCi/L
Median 0.9 pCi/L · 300 tests · 5.3 points below Washington County
- Radon levels in Nowata County, OKEPA zone 3
0.0%at or above 4 pCi/L
Median 0.2 pCi/L · 1 test · 11.3 points below Washington County
- Radon levels in Osage County, OKEPA zone 3
0.0%at or above 4 pCi/L
Median 0.9 pCi/L · 3 tests · 11.3 points below Washington County
- Radon levels in Montgomery County, KSEPA zone 2
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
- Radon levels in Chautauqua County, KSEPA zone 2
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
Washington County, Cities and towns
Cities and towns in Washington County
The Census Bureau estimates 54,037 residents in Washington County for July 1, 2025, 1,424 more than in 2020 (+2.7%). That works out to 130 people per square mile of land. Bartlesville, the largest place on its list (38,278 residents in all), extends beyond Washington County, so no share of the total is worked out for it. Testing is reported here more often than across the state: CDC's 53 reported tests for 2006 to 2015 come to 1.0 for every 1,000 residents (2025 estimate), against 0.2 for Oklahoma.
From Bartlesville to Vera, CDC publishes no figure by town: each reads Washington County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Bartlesvilleextends beyond Washington County | 38,278 | +2.5% | Counted whole |
| Dewey | 3,450 | +2.0% | 6.4% |
| Copan | 735 | +3.5% | 1.4% |
| Ramona | 547 | +4.0% | 1.0% |
| Ochelata | 435 | +3.3% | 0.8% |
| Vera | 320 | +4.6% | 0.6% |
6 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). A place that extends beyond Washington County is counted whole, so it has no share.
Washington County, Homes
Homes in Washington County
Washington County is a place of houses on their own lots: 80% of its 23,745 homes are detached single-family houses, against 73% across Oklahoma. The homes are older than Oklahoma's as a whole: half were built before 1971 (1980 for Oklahoma), and 35% date from before 1960. 72% of occupied homes are lived in by their owner (Oklahoma: 66%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Washington County | Oklahoma |
|---|---|---|
| Housing units | 23,745 | 1,763,036 |
| Detached houses | 80% | 73% |
| In buildings of 5 or more | 7% | 12% |
| Mobile homes | 6% | 9% |
| Built before 1960 | 35% | 21% |
| Built since 2000 | 16% | 25% |
| Middle year built | 1971 | 1980 |
| Owner-occupied | 72% | 66% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.