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Radon Levels in Floyd County, Virginia

EPA puts Floyd County in Zone 2, its middle radon zone, and high results are common there: 42.6% of the 54 radon tests reported to CDC (2008 to 2017, laboratory totals) came back 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

    42.6%

    12.2 pts above VA

    Floyd
    42.6%
    Virginia
    30.4%

    54 tests, 2008 to 2017

  • Median result

    3.3pCi/L

    Below action level

    Floyd
    3.3 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    54

    69th of 84 by tests

    Floyd
    54
    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

    22 of 84

    Middle half

    Floyd
    42.6%
    Russell
    67.3%

    By share, of 84 with 30+ tests

Read a result for Floyd County

Starts at Floyd County's median, 3.3 pCi/L

3.3pCi/L

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

EPA’s reading of 3.3 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. Floyd County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Floyd County, At a glance

Floyd County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Floyd 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 100% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

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

Reported results by concentration band, Floyd County, 2008 to 2017, laboratory
Under 2 pCi/L: 31%2 to 4 pCi/L: 26%4 pCi/L and above: 43%

Of 54 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Floyd County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L1731.5%
2 to 4 pCi/L1425.9%
4 pCi/L and above2342.6%
What these figures count

These are the 54 tests reported to CDC for Floyd 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

Floyd County, Compared

Floyd County radon figures, compared

Calculated by Radon411

In Floyd County, about 4 in 10 reported tests over the 2008 to 2017 laboratory totals (23 of 54) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 6.9 points higher. Across 131 Virginia counties pooled together, 30.4% of tests reached that level, so Floyd County runs 12.2 points above its state.

Of 6 neighbours with a figure, 3 reported a larger share at or above 4 pCi/L and 3 a smaller one; the spread is 21.2% (Franklin County) to 61.8% (Carroll County). By share, Floyd County is 22nd of 84 Virginia counties with 30 or more tests for the same period.

Half the tests came in under 3.3 pCi/L and half over it; the single highest reached 23.0 pCi/L. Below the action level, 17 tests (31.5%) came in under 2 pCi/L, against 44.7% statewide, and 14 tests (25.9%) 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 42.6% share point the same way here. USGS geology rates 100% of the county's land moderate radon potential.

CDC's ten-year totals for Floyd County went from 42 tests (2005 to 2014) to 54 (2008 to 2017), the share going from 42.9% to 42.6%.

Floyd County against Virginia, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Floyd County
Floyd County5442.6%3.3 pCi/LThis county
Virginia, pooled131 counties, pooled53,19930.4%Not pooled−12.2 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled−6.9 points
Russell Countyhighest in the state4967.3%6.7 pCi/L+24.7 points
Norfolk citylowest in the state732.7%0.5 pCi/L−39.9 points
Carroll County, VAborders it8961.8%5.0 pCi/L+19.2 points
Patrick County, VAborders it5354.7%5.3 pCi/L+12.1 points
Pulaski County, VAborders it26849.6%3.9 pCi/L+7.0 points
Montgomery County, VAborders it97035.5%2.5 pCi/L−7.1 points
Roanoke County, VAborders it1,54122.1%1.9 pCi/L−20.5 points
Franklin County, VAborders it57221.2%2.0 pCi/L−21.4 points
Where Floyd County's reported results fell, 2008 to 2017, laboratory, beside Virginia and the United States
ResultFloyd County testsFloyd County shareVirginia shareU.S. shareAgainst Virginia
Under 2 pCi/L1731.5%44.7%39.6%−13.2 points
2 to 4 pCi/L1425.9%24.9%24.7%+1.0 points
4 pCi/L and above2342.6%30.4%35.7%+12.2 points
Floyd 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
Winchester city17 of 8477344.8%3.3 pCi/L
Grayson County18 of 844744.7%3.8 pCi/L
Frederick County19 of 842,45144.1%3.3 pCi/L
Madison County20 of 8418444.0%3.5 pCi/L
Rockingham County21 of 841,71443.9%3.3 pCi/L
Floyd County22 of 845442.6%3.3 pCi/L
Botetourt County23 of 8457542.1%3.3 pCi/L
Radford city24 of 849841.8%3.2 pCi/L
Rappahannock County25 of 8413741.6%3.3 pCi/L
Tazewell County26 of 8437240.3%2.8 pCi/L
Culpeper County27 of 8489140.1%3.2 pCi/L
Floyd County ten-year laboratory totals, against Virginia's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestVirginia, pooledChange from the row before
2008 to 20175442.6%3.3 pCi/L23.0 pCi/L30.4%−2.5 points
2007 to 20165145.1%3.4 pCi/L23.0 pCi/L30.6%+1.6 points
2006 to 20154643.5%3.3 pCi/L23.0 pCi/L30.7%+0.6 points
2005 to 20144242.9%3.3 pCi/L23.0 pCi/L30.3%First on file

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

Floyd County, Geology

The ground under Floyd County

Predicted

USGS's geologic map puts all of Floyd 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).

USGS's geologic areas under Floyd County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Blue RidgeGranite, pegmatite, monazite, schist, and gneiss.Moderate10100%

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

Floyd County beside the ground around it

Across Virginia 47.9% of the land is rated high; none of Floyd County's is. Every one of the 6 counties that border it has more high-potential ground, Pulaski County the most at 97.5%.

Share of land by USGS radon potential: Floyd County, the 6 counties bordering it and Virginia
AreaEPA zoneLow potentialModerate potentialHigh potential
Floyd CountyZone 2None100%None
Patrick CountyZone 1None55.7%44.3%
Montgomery CountyZone 1None13.0%87.0%
Pulaski CountyZone 1None2.5%97.5%
Carroll CountyZone 2None96.1%3.9%
Roanoke CountyZone 1None34.6%65.4%
Franklin CountyZone 2None77.0%23.0%
Virginia133 counties, pooled by land areaVaries20.6%30.0%47.9%

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

Local help

Floyd County, Local resources

Radon testing and mitigation in Floyd 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

Floyd County, Questions

Questions about radon in Floyd County

Are radon levels high in Floyd County?

Over the 2008 to 2017 laboratory totals, 42.6% of the radon tests reported to CDC for Floyd County, Virginia were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.3 pCi/L. Of 84 Virginia counties with 30 or more tests for the same period, 21 reported a higher share; pooled, the state comes to 30.4%.

Which counties border Floyd County?

Floyd County borders 6 counties: Patrick County, Montgomery County, Pulaski County, Carroll County, Roanoke County and Franklin County.

Products

Floyd County, Products

Testing a home in Floyd County

In Floyd County, 42.6% of 54 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 Floyd County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Floyd County homes, compared

Explore

Floyd County, Bordering counties

Counties bordering Floyd County

Calculated by Radon411

Floyd County, Cities and towns

Cities and towns in Floyd County

The Census Bureau estimates 15,789 residents in Floyd County for July 1, 2025, 320 more than in 2020 (+2.1%). That works out to 41 people per square mile of land. Floyd, its one incorporated place, has 458 residents, 2.9% of the total. Reported testing is thin here: 54 tests over 2008 to 2017, or 3.4 for every 1,000 residents (2025 estimate), where Virginia as a whole comes to 6.0.

Floyd is the one incorporated place here; CDC publishes no figure by town, so it reads Floyd County's.

Floyd, Floyd County: residents on July 1, 2025
PlaceResidentsSince 2020Share of residents
Floyd458+1.1%2.9%

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).

Floyd County, Homes

Homes in Floyd County

Floyd County is a place of houses on their own lots: 78% of its 7,946 homes are detached single-family houses, against 61% across Virginia. Half of its homes were built before 1986, close to Virginia's 1984: 22% date from before 1960 and 26% from 2000 or later. Owners live in 84% of the occupied homes (Virginia: 67%), so for most households a test and a fix are their own to order.

Homes in Floyd County, Virginia, 2019 to 2023
HomesFloyd CountyVirginia
Housing units7,9463,654,784
Detached houses78%61%
In buildings of 5 or more2%19%
Mobile homes19%4%
Built before 196022%19%
Built since 200026%25%
Middle year built19861984
Owner-occupied84%67%

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