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Radon Levels in Stafford County, Virginia

EPA puts Stafford County in Zone 1, its highest radon zone, and 31.4% of its 2,758 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

How to test this homeFind a certified tester

  • Share at 4+ pCi/L

    31.4%

    1.0 pts above VA

    Stafford
    31.4%
    Virginia
    30.4%

    2,758 tests, 2008 to 2017

  • Median result

    2.5pCi/L

    Below action level

    Stafford
    2.5 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    2,758

    4th of 84 by tests

    Stafford
    2,758
    Fairfax
    8,657

    Reported to CDC before any fix, 2008 to 2017

  • EPA radon zone

    Zone 1

    Highest potential

    1. Zone 1
    2. 2
    3. 3

    1 highest, 3 lowest

    EPA predicts over 4 pCi/L indoors

  • Rank in Virginia

    50 of 84

    Middle half

    Stafford
    31.4%
    Russell
    67.3%

    By share, of 84 with 30+ tests

Read a result for Stafford County

Starts at Stafford 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. Stafford County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Stafford County, At a glance

Stafford County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Stafford County in and predicts an average indoor of greater than 4 pCi/L (greater than 150 Bq/m³) across the county. That is one forecast for the whole county, not a reading of any address in it; homes above EPA's turn up in all three zones.

USGS geologic potential: High across 51% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

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

Reported results by concentration band, Stafford County, 2008 to 2017, laboratory
Under 2 pCi/L: 40%2 to 4 pCi/L: 29%4 pCi/L and above: 31%

Of 2,758 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Stafford County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L1,10940.2%
2 to 4 pCi/L78328.4%
4 pCi/L and above86631.4%
What these figures count

These are the 2,758 tests reported to CDC for Stafford 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

Stafford County, Compared

Stafford County radon figures, compared

Calculated by Radon411

In Stafford County, about 3 in 10 reported tests over the 2008 to 2017 laboratory totals (866 of 2,758) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 4.3 points lower. Across 131 Virginia counties pooled together, 30.4% of tests reached that level, so Stafford County runs 1.0 points above its state.

Of 7 neighbours with a figure, 5 reported a larger share at or above 4 pCi/L and 2 a smaller one; the spread is 26.1% (Fredericksburg city) to 45.5% (King George County). By share, Stafford County is 50th 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 111.2 pCi/L. Below the action level, 1,109 tests (40.2%) came in under 2 pCi/L, against 44.7% statewide, and 783 tests (28.4%) fell between 2 and 4, against 24.9% statewide.

Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 31.4% share point the same way here. USGS geology rates 51% of the county's land high radon potential. CDC also counts 351 tests taken after mitigation in Stafford County for the same period: tests in homes where a fix was already in.

CDC's ten-year totals for Stafford County went from 1,763 tests (2005 to 2014) to 2,758 (2008 to 2017), the share going from 33.1% to 31.4%.

Stafford County against Virginia, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Stafford County
Stafford County2,75831.4%2.5 pCi/LThis county
Virginia, pooled131 counties, pooled53,19930.4%Not pooled−1.0 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+4.3 points
Russell Countyhighest in the state4967.3%6.7 pCi/L+35.9 points
Norfolk citylowest in the state732.7%0.5 pCi/L−28.7 points
King George County, VAborders it48845.5%3.6 pCi/L+14.1 points
Culpeper County, VAborders it89140.1%3.2 pCi/L+8.7 points
Spotsylvania County, VAborders it1,87234.2%2.7 pCi/L+2.8 points
Caroline County, VAborders it19932.7%2.5 pCi/L+1.3 points
Prince William County, VAborders it4,44131.7%2.3 pCi/L+0.3 points
Fauquier County, VAborders it1,19930.2%2.5 pCi/L−1.2 points
Fredericksburg city, VAborders it37526.1%2.3 pCi/L−5.3 points
Where Stafford County's reported results fell, 2008 to 2017, laboratory, beside Virginia and the United States
ResultStafford County testsStafford County shareVirginia shareU.S. shareAgainst Virginia
Under 2 pCi/L1,10940.2%44.7%39.6%−4.5 points
2 to 4 pCi/L78328.4%24.9%24.7%+3.5 points
4 pCi/L and above86631.4%30.4%35.7%+1.0 points
Stafford 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
Spotsylvania County45 of 841,87234.2%2.7 pCi/L
Salem city46 of 8428633.6%2.8 pCi/L
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
Stafford County ten-year laboratory totals, against Virginia's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestVirginia, pooledChange from the row before
2008 to 20172,75831.4%2.5 pCi/L111.2 pCi/L30.4%−0.4 points
2007 to 20162,48331.8%2.6 pCi/L111.2 pCi/L30.6%−0.7 points
2006 to 20152,14632.5%2.6 pCi/L111.2 pCi/L30.7%−0.6 points
2005 to 20141,76333.1%2.6 pCi/L111.2 pCi/L30.3%First on file

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

Stafford County, Geology

The ground under Stafford County

Predicted

USGS's geologic map splits Stafford County: 51.4% of its land is high radon potential and 46.7% low. The map puts 50.1% of Stafford County in the area it calls Inner Piedmont and 28.5% in Cretaceous Coastal Plain Sediments, with 2 smaller areas beside them. USGS gives the first a radon index of 12, in the high band (12 to 17), and the second 8, in the low band (5 to 8).

USGS's geologic areas under Stafford County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Inner PiedmontGranite, pegmatites, granitic gneiss, schist and gneiss, slate, and phyllite.High1250.1%
Cretaceous Coastal Plain SedimentsCretaceous Coastal Plain sand, silt, clay.Low828.5%
Tertiary Coastal Plain SedimentsTertiary Coastal Plain sand, silt, clayLow818.1%
Goochland TerraneGranite, pegmatites, granitic gneiss, schist and gneiss, slate, and phyllite.High131.3%

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

Stafford County beside the ground around it

On high-potential ground Stafford County is close to Virginia as a whole: 51.4% of its land against 47.9%. Of the 7 counties that border it, 1 has more high-potential ground, Spotsylvania County the most at 88.1%.

Share of land by USGS radon potential: Stafford County, the 7 counties bordering it and Virginia
AreaEPA zoneLow potentialModerate potentialHigh potential
Stafford CountyZone 146.7%None51.4%
Fredericksburg cityZone 375.6%None24.4%
King George CountyZone 396.9%NoneNone
Spotsylvania CountyZone 111.9%None88.1%
Prince William CountyZone 214.1%44.8%40.6%
Fauquier CountyZone 2None83.8%16.2%
Culpeper CountyZone 2None75.7%24.3%
Caroline CountyZone 390.1%None9.5%
Virginia133 counties, pooled by land areaVaries20.6%30.0%47.9%

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

Local help

Stafford County, Local resources

Radon testing and mitigation in Stafford 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

Stafford County, Questions

Questions about radon in Stafford County

Are radon levels high in Stafford County?

Over the 2008 to 2017 laboratory totals, 31.4% of the radon tests reported to CDC for Stafford 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, 49 reported a higher share; pooled, the state comes to 30.4%.

Which counties border Stafford County?

Stafford County borders 7 counties: Fredericksburg city, King George County, Spotsylvania County, Prince William County, Fauquier County, Culpeper County and Caroline County.

Products

Stafford County, Products

Testing a home in Stafford County

In Stafford County, 31.4% of 2,758 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 Stafford 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

Stafford County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Stafford County

Explore

Stafford County, Bordering counties

Counties bordering Stafford County

Calculated by Radon411

Stafford County, Residents

Who lives in Stafford County

Stafford County is growing: the Census Bureau puts it at 170,803 residents on July 1, 2025, up 8.3% from 157,763 in 2020. That works out to 634 people per square mile of land. Testing is reported here more often than across the state: CDC's 2,758 reported tests for 2008 to 2017 come to 16.1 for every 1,000 residents (2025 estimate), against 6.0 for Virginia.

Census lists no incorporated place in Stafford County: every home in it reads the county's figures.

Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025).

Stafford County, Homes

Homes in Stafford County

Of Stafford County's 53,864 homes, 75% are detached houses, against 61% across Virginia; 8% are in buildings of five or more homes. Much of Stafford County is recent building: 43% of its homes have gone up since 2000 and the middle year built is 1997, against 1984 for Virginia. Owners live in 81% of the occupied homes (Virginia: 67%), so for most households a test and a fix are their own to order.

Homes in Stafford County, Virginia, 2019 to 2023
HomesStafford CountyVirginia
Housing units53,8643,654,784
Detached houses75%61%
In buildings of 5 or more8%19%
Mobile homes3%4%
Built before 19605%19%
Built since 200043%25%
Middle year built19971984
Owner-occupied81%67%

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