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 Washington County, North Carolina
EPA puts Washington County in Zone 3, its lowest radon zone, and only 2 radon tests from it are on file with CDC (2020). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Nearest county
26.8%
Dare County, 44 miles
- Dare
- 26.8%
- NC
- 22.6%
Share at 4+ pCi/L, 41 tests, 2008 to 2017
Ground above low
None
34.2 pts below NC
- Washington
- 0.0%
- NC
- 34.2%
Share of land USGS rates moderate or high potential
Tests reported
2
Too few for a share
- Washington
- 2
- Needed
- 30
2020
EPA radon zone
Zone 3
Lower potential
- 1
- 2
- Zone 3
1 highest, 3 lowest
EPA predicts under 2 pCi/L indoors
Read a result for Washington County
Starts at EPA's action level
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 4.0 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.
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, 2020
CDC holds 2 reported tests for Washington County in 2020, with a median of 0.3 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 2 tests were reported to CDC for Washington County over 2020, 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: 2020. Measured data period: 2007 to 2020 (every CDC figure on file).
Washington County, Compared
Washington County radon figures, compared
Calculated by Radon411CDC's largest figure for Washington County rests on 2 tests in 2020, 0 of them at or above 4 pCi/L, so each test moves its share by 50.0 points and no rank or comparison is drawn from it. Results reached as high as 0.4 pCi/L, with a middle value of 0.3 pCi/L.
The nearest counties with a figure are Dare County (44 miles away) at 26.8%, Pitt County (48 miles away) at 1.0% and Craven County (56 miles away) at 0.0%. Pooled across 99 North Carolina counties, 22.6% of reported tests reached that level; across every county in the country with a figure, 35.7%.
Statewide for the same period, Transylvania County reported the highest share (47.8%) and Nash County the lowest (0.0%). EPA's 1993 map puts Washington County in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 100% of the county's land low radon potential.
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. The map puts 85.8% of Washington County in the area it calls Outer Coastal Plain and 14.0% in Inner Coastal Plain. USGS gives the first a radon index of 7 and the second 8, both in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Outer Coastal Plain | Unconsolidated sand. | Low | 7 | 85.8% |
| Inner Coastal Plain | Fossiliferous clay and sand, shelly sand, sandy marl, and limestone. | Low | 8 | 14.0% |
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 North Carolina 1.3% of the land is rated high; none of Washington County's is. None of the 5 counties that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
Washington County, Local resources
Radon testing and mitigation in Washington County
- North Carolina Radon ProgramNorth Carolina Radon Program, run by NCDHHS, answers questions about testing, mitigation and the rules in North Carolina.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
- Professionals in North Carolina2 professionals are listed in North Carolina.
What North Carolina's program says
- Licensing of radon professionals
The North Carolina Radon Program is presently developing a Radon Proficiency Program as directed by Session Law 2023-91 House Bill 782 .
What it means
Washington County, Questions
Questions about radon in Washington County
Are radon levels high in Washington County?
In 2020, 0.0% of the radon tests reported to CDC for Washington County, North Carolina were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.3 pCi/L. Of the 8 nearest counties with a figure, within 86 miles, the share of tests at or above 4 pCi/L runs from 0.0% to 42.4%.
Which counties border Washington County?
Washington County borders 5 counties: Tyrrell County, Bertie County, Beaufort County, Hyde County and Martin County.
Products
Washington County, Products
Testing a home in Washington County
No CDC figure names Washington County; the nearest county with one, Dare County (44 miles away), reported 26.8% of its tests at or above 4 pCi/L over the 2008 to 2017 laboratory totals, the only reading nearby until a test of this home. 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
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
Washington County, Bordering counties
Counties bordering Washington County
Calculated by Radon411- Radon levels in Bertie CountyEPA zone 3
25.0%at or above 4 pCi/L
Median 1.1 pCi/L · 4 tests
- Radon levels in Tyrrell CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 1 test
- Radon levels in Beaufort CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 23 tests
- Radon levels in Hyde CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 4 tests
- Radon levels in Martin CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.6 pCi/L · 4 tests
Washington County, Cities and towns
Cities and towns in Washington County
About 10,638 people live in Washington County by the Census Bureau's estimate for July 1, 2025, 338 fewer than in 2020 (−3.1%). That works out to 31 people per square mile of land. Its largest town, Plymouth, has 3,170 residents, 29.8% of the total. Together its 3 incorporated places hold 36.1% of those residents; the other 63.9% live outside any of them. Reported testing is thin here: 2 tests over 2020, or 0.2 for every 1,000 residents (2025 estimate), where North Carolina as a whole comes to 1.0.
From Plymouth to Creswell, CDC publishes no figure by town: each reads Washington County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Plymouth | 3,170 | −4.2% | 29.8% |
| Roper | 471 | −2.5% | 4.4% |
| Creswell | 200 | −3.8% | 1.9% |
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).
Washington County, Homes
Homes in Washington County
Of Washington County's 6,045 homes, 69% are detached houses, against 65% across North Carolina; 23% are mobile homes. The homes are older than North Carolina's as a whole: half were built before 1975 (1990 for North Carolina), and 26% date from before 1960. 69% of occupied homes are lived in by their owner (North Carolina: 66%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Washington County | North Carolina |
|---|---|---|
| Housing units | 6,045 | 4,815,195 |
| Detached houses | 69% | 65% |
| In buildings of 5 or more | 1% | 14% |
| Mobile homes | 23% | 11% |
| Built before 1960 | 26% | 14% |
| Built since 2000 | 13% | 33% |
| Middle year built | 1975 | 1990 |
| Owner-occupied | 69% | 66% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.