Short-term kit
PicoCan short-term charcoal canister radon test
- Lab fee included
Method: Charcoal
In home: 48 to 96 hours
Locations and reports
Radon Levels in Greene County, Virginia
EPA puts Greene County in Zone 2, its middle radon zone, and 34.6% of its 214 reported radon tests (2008 to 2017, laboratory totals) 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
34.6%
4.2 pts above VA
- Greene
- 34.6%
- Virginia
- 30.4%
214 tests, 2008 to 2017
Median result
2.8pCi/L
Below action level
- Greene
- 2.8 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
214
43rd of 84 by tests
- Greene
- 214
- Fairfax
- 8,657
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 Virginia
44 of 84
Middle half
- Greene
- 34.6%
- Russell
- 67.3%
By share, of 84 with 30+ tests
Read a result for Greene County
Starts at Greene County's median, 2.8 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.8 pCi/L
Between 2 and 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is between 2 and 4 pCi/L. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. Greene County's median reported result, 2008 to 2017.
The data
Greene County, At a glance
Greene County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Greene County is a
USGS geologic potential: Moderate across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Greene County, 2008 to 2017, laboratory
Under 2 pCi/L: 36%2 to 4 pCi/L: 29%4 pCi/L and above: 35%
Of 214 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 77 | 36.0% |
| 2 to 4 pCi/L | 63 | 29.4% |
| 4 pCi/L and above | 74 | 34.6% |
What these figures count
These are the 214 tests reported to CDC for Greene County over 2008 to 2017 (laboratory totals), 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: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).
Greene County, Compared
Greene County radon figures, compared
Calculated by Radon411In Greene County, about 3 in 10 reported tests over the 2008 to 2017 laboratory totals (74 of 214) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 1.1 points lower. Across 131 Virginia counties pooled together, 30.4% of tests reached that level, so Greene County runs 4.2 points above its state.
Of 5 neighbours with a figure, 4 reported a larger share at or above 4 pCi/L and 1 a smaller one; the spread is 24.7% (Albemarle County) to 44.0% (Madison County). By share, Greene County is 44th of 84 Virginia counties with 30 or more tests for the same period.
Half the tests came in under 2.8 pCi/L and half over it; the single highest reached 127.5 pCi/L. Below the action level, 77 tests (36.0%) came in under 2 pCi/L, against 44.7% statewide, and 63 tests (29.4%) fell between 2 and 4, against 24.9% statewide.
Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 34.6% share point the same way here. USGS geology rates 100% of the county's land moderate radon potential. CDC also counts 6 tests taken after mitigation in Greene County for the same period: tests in homes where a fix was already in.
CDC's ten-year totals for Greene County went from 148 tests (2005 to 2014) to 214 (2008 to 2017), the share going from 33.1% to 34.6%.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Greene County, Geology
The ground under Greene County
PredictedUSGS's geologic map puts all of Greene County's mapped land in one class: moderate radon potential. All of it lies in the area the map calls Blue Ridge, to which USGS gives a radon index of 10, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Blue Ridge | Granite, pegmatite, monazite, schist, and gneiss. | Moderate | 10 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Greene County beside the ground around it
Across Virginia 47.9% of the land is rated high; none of Greene County's is. Every one of the 5 counties that border it has more high-potential ground, Rockingham County the most at 95.2%.
The map rates the ground, not the air in any home.
Local help
Greene County, Local resources
Radon testing and mitigation in Greene County
- VDH Radon ProgramVDH Radon Program answers questions about testing, mitigation and the rules in Virginia.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 Virginia2 professionals are listed in Virginia.
What Virginia's program says
- Phone
- (804) 864-8161
- Radon@vdh.virginia.gov
- Licensing of radon professionals
The Code of Virginia requires that Radon testers and mitigators be currently certified by either the National Radon Proficiency Program (NRPP) or the National Radon Safety Board (NRSB).
What it means
Greene County, Questions
Questions about radon in Greene County
Are radon levels high in Greene County?
Over the 2008 to 2017 laboratory totals, 34.6% of the radon tests reported to CDC for Greene County, Virginia were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.8 pCi/L. Of 84 Virginia counties with 30 or more tests for the same period, 43 reported a higher share; pooled, the state comes to 30.4%.
Which counties border Greene County?
Greene County borders 5 counties: Madison County, Page County, Orange County, Albemarle County and Rockingham County.
Products
Greene County, Products
Testing a home in Greene County
In Greene County, 34.6% of 214 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 30.4% pooled across Virginia. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Greene County; a long-term test tells the year-round average.
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
RadonScan-Plus USB-powered radon monitor with Wi-Fi
- C-NRPP 2024/25: Not included
- Plug-in
- Wi-Fi
- Alarm
- Screen, app
First reading: Within 5 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Greene County, Bordering counties
Counties bordering Greene County
Calculated by Radon411- Radon levels in Madison CountyEPA zone 2
44.0%at or above 4 pCi/L
Median 3.5 pCi/L · 184 tests · 9.4 points above Greene County
- Radon levels in Rockingham CountyEPA zone 1
43.9%at or above 4 pCi/L
Median 3.3 pCi/L · 1,714 tests · 9.3 points above Greene County
- Radon levels in Page CountyEPA zone 1
38.3%at or above 4 pCi/L
Median 3.3 pCi/L · 141 tests · 3.7 points above Greene County
- Radon levels in Orange CountyEPA zone 1
36.1%at or above 4 pCi/L
Median 2.8 pCi/L · 462 tests · 1.5 points above Greene County
- Radon levels in Albemarle CountyEPA zone 2
24.7%at or above 4 pCi/L
Median 2.1 pCi/L · 2,179 tests · 9.9 points below Greene County
Greene County, Cities and towns
Cities and towns in Greene County
Greene County is growing: the Census Bureau puts it at 21,958 residents on July 1, 2025, up 6.6% from 20,601 in 2020. That works out to 141 people per square mile of land. Stanardsville, its one incorporated place, has 366 residents, 1.7% of the total. Testing is reported here more often than across the state: CDC's 214 reported tests for 2008 to 2017 come to 9.7 for every 1,000 residents (2025 estimate), against 6.0 for Virginia.
Stanardsville is the one incorporated place here; CDC publishes no figure by town, so it reads Greene County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Stanardsville | 366 | +6.1% | 1.7% |
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).
Greene County, Homes
Homes in Greene County
Greene County is a place of houses on their own lots: 85% of its 8,687 homes are detached single-family houses, against 61% across Virginia. Much of Greene County is recent building: 35% of its homes have gone up since 2000 and the middle year built is 1994, against 1984 for Virginia. Owners live in 80% of the occupied homes (Virginia: 67%), so for most households a test and a fix are their own to order.
| Homes | Greene County | Virginia |
|---|---|---|
| Housing units | 8,687 | 3,654,784 |
| Detached houses | 85% | 61% |
| In buildings of 5 or more | 5% | 19% |
| Mobile homes | 6% | 4% |
| Built before 1960 | 12% | 19% |
| Built since 2000 | 35% | 25% |
| Middle year built | 1994 | 1984 |
| Owner-occupied | 80% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.