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Radon Levels in Fauquier County, Virginia

EPA puts Fauquier County in Zone 2, its middle radon zone, and 30.2% of its 1,199 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

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  • Share at 4+ pCi/L

    30.2%

    0.2 pts below VA

    Fauquier
    30.2%
    Virginia
    30.4%

    1,199 tests, 2008 to 2017

  • Median result

    2.5pCi/L

    Below action level

    Fauquier
    2.5 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    1,199

    10th of 84 by tests

    Fauquier
    1,199
    Fairfax
    8,657

    Reported to CDC before any fix, 2008 to 2017

  • EPA radon zone

    Zone 2

    Moderate potential

    1. 1
    2. Zone 2
    3. 3

    1 highest, 3 lowest

    EPA predicts 2 to 4 pCi/L indoors

  • Rank in Virginia

    52 of 84

    Middle half

    Fauquier
    30.2%
    Russell
    67.3%

    By share, of 84 with 30+ tests

Read a result for Fauquier County

Starts at Fauquier County's median, 2.5 pCi/L

2.5pCi/L

EPA’s own thresholds; the figures are the area’s, never this home’s.

EPA’s reading of 2.5 pCi/L

Between 2 and 4 pCi/L

  1. Under 20 to 1.9 pCi/L
  2. 2 to 4consider a fix
  3. 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. Fauquier County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Fauquier County, At a glance

Fauquier County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Fauquier County is a county: EPA's forecast for it as a whole is an average indoor of 2 to 4 pCi/L (75 to 150 Bq/m³). It describes no single address, and homes above EPA's are found in every zone, this one included.

USGS geologic potential: Moderate across 84% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Fauquier County, 2008 to 2017, laboratory

Reported results by concentration band, Fauquier County, 2008 to 2017, laboratory
Under 2 pCi/L: 41%2 to 4 pCi/L: 29%4 pCi/L and above: 30%

Of 1,199 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Fauquier County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L49541.3%
2 to 4 pCi/L34228.5%
4 pCi/L and above36230.2%
What these figures count

These are the 1,199 tests reported to CDC for Fauquier 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).

How to read these figures

Fauquier County, Compared

Fauquier County radon figures, compared

Calculated by Radon411

In Fauquier County, about 3 in 10 reported tests over the 2008 to 2017 laboratory totals (362 of 1,199) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 5.5 points lower. Across 131 Virginia counties pooled together, 30.4% of tests reached that level, so Fauquier County runs 0.2 points below its state.

Of 7 neighbours with a figure, 6 reported a larger share at or above 4 pCi/L and 1 a smaller one; the spread is 27.4% (Loudoun County) to 47.7% (Clarke County). By share, Fauquier County is 52nd of 84 Virginia counties with 30 or more tests for the same period.

Half the tests came in under 2.5 pCi/L and half over it; the single highest reached 132.4 pCi/L. Below the action level, 495 tests (41.3%) came in under 2 pCi/L, against 44.7% statewide, and 342 tests (28.5%) 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 30.2% share point the same way here. USGS geology rates 84% of the county's land moderate radon potential. CDC also counts 140 tests taken after mitigation in Fauquier County for the same period: tests in homes where a fix was already in.

CDC's ten-year totals for Fauquier County went from 748 tests (2005 to 2014) to 1,199 (2008 to 2017), the share going from 31.6% to 30.2%.

Fauquier County against Virginia, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Fauquier County
Fauquier County1,19930.2%2.5 pCi/LThis county
Virginia, pooled131 counties, pooled53,19930.4%Not pooled+0.2 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+5.5 points
Russell Countyhighest in the state4967.3%6.7 pCi/L+37.1 points
Norfolk citylowest in the state732.7%0.5 pCi/L−27.5 points
Clarke County, VAborders it35047.7%3.5 pCi/L+17.5 points
Rappahannock County, VAborders it13741.6%3.3 pCi/L+11.4 points
Culpeper County, VAborders it89140.1%3.2 pCi/L+9.9 points
Warren County, VAborders it53636.9%2.7 pCi/L+6.7 points
Prince William County, VAborders it4,44131.7%2.3 pCi/L+1.5 points
Stafford County, VAborders it2,75831.4%2.5 pCi/L+1.2 points
Loudoun County, VAborders it4,45727.4%1.8 pCi/L−2.8 points
Where Fauquier County's reported results fell, 2008 to 2017, laboratory, beside Virginia and the United States
ResultFauquier County testsFauquier County shareVirginia shareU.S. shareAgainst Virginia
Under 2 pCi/L49541.3%44.7%39.6%−3.4 points
2 to 4 pCi/L34228.5%24.9%24.7%+3.6 points
4 pCi/L and above36230.2%30.4%35.7%−0.2 points
Fauquier County ranked among the 84 Virginia counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Harrisonburg city47 of 8459933.4%2.4 pCi/L
Caroline County48 of 8419932.7%2.5 pCi/L
Prince William County49 of 844,44131.7%2.3 pCi/L
Stafford County50 of 842,75831.4%2.5 pCi/L
Goochland County51 of 8411430.7%2.4 pCi/L
Fauquier County52 of 841,19930.2%2.5 pCi/L
Chesterfield County53 of 8473329.6%2.2 pCi/L
Nelson County54 of 8412228.7%2.6 pCi/L
Wise County55 of 845328.3%1.3 pCi/L
Fluvanna County56 of 8438828.1%2.5 pCi/L
Powhatan County57 of 845028.0%1.7 pCi/L
Fauquier County ten-year laboratory totals, against Virginia's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestVirginia, pooledChange from the row before
2008 to 20171,19930.2%2.5 pCi/L132.4 pCi/L30.4%+0.3 points
2007 to 20161,05929.9%2.4 pCi/L132.4 pCi/L30.6%−1.3 points
2006 to 201590631.2%2.5 pCi/L132.4 pCi/L30.7%−0.4 points
2005 to 201474831.6%2.6 pCi/L29.5 pCi/L30.3%First on file

Pooled shares: Radon411's sum of CDC's county counts for one period.

Fauquier County, Geology

The ground under Fauquier County

Predicted

Most of the ground under Fauquier County is one class on USGS's geologic map: 83.8% of its land is moderate radon potential, with 16.2% high. The map puts 54.9% of Fauquier County in the area it calls Blue Ridge and 28.9% in Mesozoic Basins, with one smaller area beside them. USGS gives the first a radon index of 10 and the second 11, both in the moderate band (9 to 11).

USGS's geologic areas under Fauquier County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Blue RidgeGranite, pegmatite, monazite, schist, and gneiss.Moderate1054.9%
Mesozoic BasinsSandstone, siltstone and lacustrine black shale.Moderate1128.9%
Inner PiedmontGranite, pegmatites, granitic gneiss, schist and gneiss, slate, and phyllite.High1216.2%

Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.

Fauquier County beside the ground around it

Virginia as a whole has more high-potential ground than Fauquier County: 47.9% of its land, against 16.2% here. Of the 7 counties that border it, 5 have more high-potential ground, Clarke County the most at 83.3%.

Share of land by USGS radon potential: Fauquier County, the 7 counties bordering it and Virginia
AreaEPA zoneLow potentialModerate potentialHigh potential
Fauquier CountyZone 2None83.8%16.2%
Prince William CountyZone 214.1%44.8%40.6%
Rappahannock CountyZone 2None100%None
Culpeper CountyZone 2None75.7%24.3%
Warren CountyZone 1None47.3%52.7%
Stafford CountyZone 146.7%None51.4%
Loudoun CountyZone 2None98.7%1.3%
Clarke CountyZone 1None16.7%83.3%
Virginia133 counties, pooled by land areaVaries20.6%30.0%47.9%

The map rates the ground, not the air in any home.

Local help

Fauquier County, Local resources

Radon testing and mitigation in Fauquier County

What Virginia's program says
Phone
(804) 864-8161
Email
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

Fauquier County, Questions

Questions about radon in Fauquier County

Are radon levels high in Fauquier County?

Over the 2008 to 2017 laboratory totals, 30.2% of the radon tests reported to CDC for Fauquier County, Virginia were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.5 pCi/L. Of 84 Virginia counties with 30 or more tests for the same period, 51 reported a higher share; pooled, the state comes to 30.4%.

Which counties border Fauquier County?

Fauquier County borders 7 counties: Prince William County, Rappahannock County, Culpeper County, Warren County, Stafford County, Loudoun County and Clarke County.

Products

Fauquier County, Products

Testing a home in Fauquier County

In Fauquier County, 30.2% of 1,199 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 Fauquier County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Fauquier County homes, compared

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Fauquier County, Bordering counties

Counties bordering Fauquier County

Calculated by Radon411

Fauquier County, Cities and towns

Cities and towns in Fauquier County

The Census Bureau estimates 76,503 residents in Fauquier County for July 1, 2025, 3,491 more than in 2020 (+4.8%). That works out to 118 people per square mile of land. No town dominates: Warrenton, the largest, has 10,213 residents, 13.3% of the total. Together its 3 incorporated places hold 14.5% of those residents; the other 85.5% live outside any of them. Testing is reported here more often than across the state: CDC's 1,199 reported tests for 2008 to 2017 come to 15.7 for every 1,000 residents (2025 estimate), against 6.0 for Virginia.

From Warrenton to The Plains, CDC publishes no figure by town: each reads Fauquier County's.

The cities and towns in Fauquier County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Warrenton10,213+1.6%13.3%
Remington649+4.7%0.8%
The Plains261+5.2%0.3%

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).

Fauquier County, Homes

Homes in Fauquier County

Fauquier County is a place of houses on their own lots: 85% of its 28,454 homes are detached single-family houses, against 61% across Virginia. Half of its homes were built before 1986, close to Virginia's 1984: 18% date from before 1960 and 28% from 2000 or later. Owners live in 78% of the occupied homes (Virginia: 67%), so for most households a test and a fix are their own to order.

Homes in Fauquier County, Virginia, 2019 to 2023
HomesFauquier CountyVirginia
Housing units28,4543,654,784
Detached houses85%61%
In buildings of 5 or more4%19%
Mobile homes2%4%
Built before 196018%19%
Built since 200028%25%
Middle year built19861984
Owner-occupied78%67%

Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.