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
Locations and reports
Radon Levels in Shenandoah County, Virginia
EPA puts Shenandoah County in Zone 1, its highest radon zone, and 36.4% of its 390 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
36.4%
6.0 pts above VA
- Shenandoah
- 36.4%
- Virginia
- 30.4%
390 tests, 2008 to 2017
Median result
2.7pCi/L
Below action level
- Shenandoah
- 2.7 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
390
30th of 84 by tests
- Shenandoah
- 390
- Fairfax
- 8,657
Reported to CDC before any fix, 2008 to 2017
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Rank in Virginia
39 of 84
Middle half
- Shenandoah
- 36.4%
- Russell
- 67.3%
By share, of 84 with 30+ tests
Read a result for Shenandoah County
Starts at Shenandoah County's median, 2.7 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.7 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. Shenandoah County's median reported result, 2008 to 2017.
The data
Shenandoah County, At a glance
Shenandoah County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Shenandoah County in
USGS geologic potential: High across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Shenandoah County, 2008 to 2017, laboratory
Under 2 pCi/L: 39%2 to 4 pCi/L: 25%4 pCi/L and above: 36%
Of 390 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 152 | 39.0% |
| 2 to 4 pCi/L | 96 | 24.6% |
| 4 pCi/L and above | 142 | 36.4% |
What these figures count
These are the 390 tests reported to CDC for Shenandoah 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).
Shenandoah County, Compared
Shenandoah County radon figures, compared
Calculated by Radon411In Shenandoah County, about 4 in 10 reported tests over the 2008 to 2017 laboratory totals (142 of 390) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 0.7 points higher. Across 131 Virginia counties pooled together, 30.4% of tests reached that level, so Shenandoah County runs 6.0 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 22.6% (Hardy County, WV) to 44.1% (Frederick County). By share, Shenandoah County is 39th of 84 Virginia counties with 30 or more tests for the same period.
Half the tests came in under 2.7 pCi/L and half over it; the single highest reached 41.2 pCi/L. Below the action level, 152 tests (39.0%) came in under 2 pCi/L, against 44.7% statewide, and 96 tests (24.6%) fell between 2 and 4, against 24.9% statewide.
Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 36.4% share point the same way here. USGS geology rates 100% of the county's land high radon potential. CDC also counts 9 tests taken after mitigation in Shenandoah County for the same period: tests in homes where a fix was already in.
CDC's ten-year totals for Shenandoah County went from 302 tests (2005 to 2014) to 390 (2008 to 2017), the share going from 42.7% to 36.4%.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Shenandoah County, Geology
The ground under Shenandoah County
PredictedUSGS's geologic map puts all of Shenandoah County's mapped land in one class: high radon potential. All of it lies in the area the map calls Valley and Ridge, to which USGS gives a radon index of 15, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Valley and Ridge | Cambrian dolomite, limestone, shale, and sandstone, Silurian-Ordovician limestone, dolomite, shale, and sandstone, Mississippian-Devonian sandstone, shale, limestone, gypsum, and coal. | High | 15 | 99.8% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Shenandoah County beside the ground around it
Shenandoah County has more high-potential ground than Virginia as a whole: 100% of its land against 47.9%. Of the 5 counties that border it, none has as large a share of high-potential ground; Frederick County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Shenandoah County, Local resources
Radon testing and mitigation in Shenandoah 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
Shenandoah County, Questions
Questions about radon in Shenandoah County
Are radon levels high in Shenandoah County?
Over the 2008 to 2017 laboratory totals, 36.4% of the radon tests reported to CDC for Shenandoah County, Virginia were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.7 pCi/L. Of 84 Virginia counties with 30 or more tests for the same period, 38 reported a higher share; pooled, the state comes to 30.4%.
Which counties border Shenandoah County?
Shenandoah County borders 5 counties: Hardy County, WV, Page County, VA, Warren County, VA, Rockingham County, VA and Frederick County, VA.
Products
Shenandoah County, Products
Testing a home in Shenandoah County
In Shenandoah County, 36.4% of 390 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 30.4% pooled across Virginia. In Zone 1 the year-round level in Shenandoah County is the one to know: a long-term test (more than 90 days) or a monitor, with a short-term kit for a first answer.
Test kits and monitors3
See every kit and monitor
Monitor
RM-65 rechargeable radon detector with a color screen and alarm
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 6 hours
Short-term kit
RA100 short-term liquid scintillation radon test kit
- Lab fee extra
Method: Liquid scintillation
In home: 48 to 96 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Shenandoah County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Shenandoah County
Explore
Shenandoah County, Bordering counties
Counties bordering Shenandoah County
Calculated by Radon411- Radon levels in Frederick County, VAEPA zone 1
44.1%at or above 4 pCi/L
Median 3.3 pCi/L · 2,451 tests · 7.7 points above Shenandoah County
- Radon levels in Rockingham County, VAEPA zone 1
43.9%at or above 4 pCi/L
Median 3.3 pCi/L · 1,714 tests · 7.5 points above Shenandoah County
- Radon levels in Page County, VAEPA zone 1
38.3%at or above 4 pCi/L
Median 3.3 pCi/L · 141 tests · 1.9 points above Shenandoah County
- Radon levels in Warren County, VAEPA zone 1
36.9%at or above 4 pCi/L
Median 2.7 pCi/L · 536 tests · 0.5 points above Shenandoah County
- Radon levels in Hardy County, WVEPA zone 1
22.6%at or above 4 pCi/L
Median 1.6 pCi/L · 53 tests · 13.8 points below Shenandoah County
Shenandoah County, Cities and towns
Cities and towns in Shenandoah County
The Census Bureau estimates 45,839 residents in Shenandoah County for July 1, 2025, 1,581 more than in 2020 (+3.6%). That works out to 90 people per square mile of land. No town dominates: Strasburg, the largest, has 7,380 residents, 16.1% of the total. Together its 6 incorporated places hold 41.8% of those residents; the other 58.2% live outside any of them. CDC's 390 reported tests for 2008 to 2017 work out to 8.5 per 1,000 residents (2025 estimate), close to Virginia's 6.0.
From Strasburg to Toms Brook, CDC publishes no figure by town: each reads Shenandoah County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Strasburg | 7,380 | +3.5% | 16.1% |
| Woodstock | 6,002 | +3.4% | 13.1% |
| New Market | 2,222 | +3.4% | 4.8% |
| Mount Jackson | 2,040 | +3.9% | 4.5% |
| Edinburg | 1,225 | +3.4% | 2.7% |
| Toms Brook | 285 | +3.3% | 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).
Shenandoah County, Homes
Homes in Shenandoah County
Shenandoah County is a place of houses on their own lots: 76% of its 21,319 homes are detached single-family houses, against 61% across Virginia. Half of its homes were built before 1981, close to Virginia's 1984: 25% date from before 1960 and 24% from 2000 or later. 72% of occupied homes are lived in by their owner (Virginia: 67%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Shenandoah County | Virginia |
|---|---|---|
| Housing units | 21,319 | 3,654,784 |
| Detached houses | 76% | 61% |
| In buildings of 5 or more | 10% | 19% |
| Mobile homes | 4% | 4% |
| Built before 1960 | 25% | 19% |
| Built since 2000 | 24% | 25% |
| Middle year built | 1981 | 1984 |
| Owner-occupied | 72% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.