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Radon Levels in Spotsylvania County, Virginia

EPA puts Spotsylvania County in Zone 1, its highest radon zone, and 34.2% of its 1,872 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

    34.2%

    3.8 pts above VA

    Spotsylvania
    34.2%
    Virginia
    30.4%

    1,872 tests, 2008 to 2017

  • Median result

    2.7pCi/L

    Below action level

    Spotsylvania
    2.7 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    1,872

    7th of 84 by tests

    Spotsylvania
    1,872
    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

    45 of 84

    Middle half

    Spotsylvania
    34.2%
    Russell
    67.3%

    By share, of 84 with 30+ tests

Read a result for Spotsylvania County

Starts at Spotsylvania County's median, 2.7 pCi/L

2.7pCi/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

  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. Spotsylvania County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Spotsylvania County, At a glance

Spotsylvania County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Spotsylvania 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 88% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

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

Reported results by concentration band, Spotsylvania County, 2008 to 2017, laboratory
Under 2 pCi/L: 36%2 to 4 pCi/L: 30%4 pCi/L and above: 34%

Of 1,872 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Spotsylvania County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L67336.0%
2 to 4 pCi/L55929.9%
4 pCi/L and above64034.2%
What these figures count

These are the 1,872 tests reported to CDC for Spotsylvania 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

Spotsylvania County, Compared

Spotsylvania County radon figures, compared

Calculated by Radon411

In Spotsylvania County, about 3 in 10 reported tests over the 2008 to 2017 laboratory totals (640 of 1,872) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 1.5 points lower. Across 131 Virginia counties pooled together, 30.4% of tests reached that level, so Spotsylvania County runs 3.8 points above its state.

Of 7 neighbours with a figure, 3 reported a larger share at or above 4 pCi/L and 4 a smaller one; the spread is 23.0% (Hanover County) to 40.1% (Culpeper County). By share, Spotsylvania County is 45th 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 38.0 pCi/L. Below the action level, 673 tests (36.0%) came in under 2 pCi/L, against 44.7% statewide, and 559 tests (29.9%) fell between 2 and 4, against 24.9% statewide.

Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 34.2% share point the same way here. USGS geology rates 88% of the county's land high radon potential. CDC also counts 234 tests taken after mitigation in Spotsylvania County for the same period: tests in homes where a fix was already in.

CDC's ten-year totals for Spotsylvania County went from 1,078 tests (2005 to 2014) to 1,872 (2008 to 2017), the share going from 34.3% to 34.2%.

Spotsylvania County against Virginia, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Spotsylvania County
Spotsylvania County1,87234.2%2.7 pCi/LThis county
Virginia, pooled131 counties, pooled53,19930.4%Not pooled−3.8 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+1.5 points
Russell Countyhighest in the state4967.3%6.7 pCi/L+33.1 points
Norfolk citylowest in the state732.7%0.5 pCi/L−31.5 points
Culpeper County, VAborders it89140.1%3.2 pCi/L+5.9 points
Louisa County, VAborders it28938.1%2.8 pCi/L+3.9 points
Orange County, VAborders it46236.1%2.8 pCi/L+1.9 points
Caroline County, VAborders it19932.7%2.5 pCi/L−1.5 points
Stafford County, VAborders it2,75831.4%2.5 pCi/L−2.8 points
Fredericksburg city, VAborders it37526.1%2.3 pCi/L−8.1 points
Hanover County, VAborders it16523.0%1.9 pCi/L−11.2 points
Where Spotsylvania County's reported results fell, 2008 to 2017, laboratory, beside Virginia and the United States
ResultSpotsylvania County testsSpotsylvania County shareVirginia shareU.S. shareAgainst Virginia
Under 2 pCi/L67336.0%44.7%39.6%−8.7 points
2 to 4 pCi/L55929.9%24.9%24.7%+5.0 points
4 pCi/L and above64034.2%30.4%35.7%+3.8 points
Spotsylvania 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
Orange County40 of 8446236.1%2.8 pCi/L
Henry County41 of 8411535.7%2.7 pCi/L
Montgomery County42 of 8497035.5%2.5 pCi/L
Danville city43 of 847735.1%3.0 pCi/L
Greene County44 of 8421434.6%2.8 pCi/L
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
Spotsylvania County ten-year laboratory totals, against Virginia's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestVirginia, pooledChange from the row before
2008 to 20171,87234.2%2.7 pCi/L38.0 pCi/L30.4%−0.7 points
2007 to 20161,60934.9%2.8 pCi/L38.0 pCi/L30.6%+0.4 points
2006 to 20151,35034.5%2.8 pCi/L31.7 pCi/L30.7%+0.2 points
2005 to 20141,07834.3%2.7 pCi/L31.7 pCi/L30.3%First on file

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

Spotsylvania County, Geology

The ground under Spotsylvania County

Predicted

Most of the ground under Spotsylvania County is one class on USGS's geologic map: 88.1% of its land is high radon potential, with 11.9% low. The map puts 54.0% of Spotsylvania County in the area it calls Inner Piedmont and 34.1% in Goochland Terrane, with 2 smaller areas beside them. USGS gives the first a radon index of 12 and the second 13, both in the high band (12 to 17).

USGS's geologic areas under Spotsylvania County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Inner PiedmontGranite, pegmatites, granitic gneiss, schist and gneiss, slate, and phyllite.High1254.0%
Goochland TerraneGranite, pegmatites, granitic gneiss, schist and gneiss, slate, and phyllite.High1334.1%
Tertiary Coastal Plain SedimentsTertiary Coastal Plain sand, silt, clayLow89.3%
Cretaceous Coastal Plain SedimentsCretaceous Coastal Plain sand, silt, clay.Low82.6%

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

Spotsylvania County beside the ground around it

Spotsylvania County has more high-potential ground than Virginia as a whole: 88.1% of its land against 47.9%. Of the 7 counties that border it, 1 has more high-potential ground, Louisa County the most at 100%.

Share of land by USGS radon potential: Spotsylvania County, the 7 counties bordering it and Virginia
AreaEPA zoneLow potentialModerate potentialHigh potential
Spotsylvania CountyZone 111.9%None88.1%
Fredericksburg cityZone 375.6%None24.4%
Orange CountyZone 1None13.2%86.8%
Stafford CountyZone 146.7%None51.4%
Caroline CountyZone 390.1%None9.5%
Louisa CountyZone 1NoneNone100%
Culpeper CountyZone 2None75.7%24.3%
Hanover CountyZone 347.8%None52.2%
Virginia133 counties, pooled by land areaVaries20.6%30.0%47.9%

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

Local help

Spotsylvania County, Local resources

Radon testing and mitigation in Spotsylvania 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

Spotsylvania County, Questions

Questions about radon in Spotsylvania County

Are radon levels high in Spotsylvania County?

Over the 2008 to 2017 laboratory totals, 34.2% of the radon tests reported to CDC for Spotsylvania 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, 44 reported a higher share; pooled, the state comes to 30.4%.

Which counties border Spotsylvania County?

Spotsylvania County borders 7 counties: Fredericksburg city, Orange County, Stafford County, Caroline County, Louisa County, Culpeper County and Hanover County.

Products

Spotsylvania County, Products

Testing a home in Spotsylvania County

In Spotsylvania County, 34.2% of 1,872 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 Spotsylvania 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

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

Explore

Spotsylvania County, Bordering counties

Counties bordering Spotsylvania County

Calculated by Radon411

Spotsylvania County, Residents

Who lives in Spotsylvania County

Spotsylvania County is growing: the Census Bureau puts it at 155,388 residents on July 1, 2025, up 10.5% from 140,611 in 2020. That works out to 387 people per square mile of land. Testing is reported here more often than across the state: CDC's 1,872 reported tests for 2008 to 2017 come to 12.0 for every 1,000 residents (2025 estimate), against 6.0 for Virginia.

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

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

Spotsylvania County, Homes

Homes in Spotsylvania County

Spotsylvania County is a place of houses on their own lots: 77% of its 54,020 homes are detached single-family houses, against 61% across Virginia. Much of Spotsylvania County is recent building: 41% of its homes have gone up since 2000 and the middle year built is 1996, 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 in Spotsylvania County, Virginia, 2019 to 2023
HomesSpotsylvania CountyVirginia
Housing units54,0203,654,784
Detached houses77%61%
In buildings of 5 or more9%19%
Mobile homes4%4%
Built before 19605%19%
Built since 200041%25%
Middle year built19961984
Owner-occupied80%67%

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