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Radon Levels in Randolph County, West Virginia

EPA puts Randolph County in Zone 2, its middle radon zone, and 36.4% of its 33 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

    36.4%

    1.1 pts below WV

    Randolph
    36.4%
    WV
    37.5%

    33 tests, 2008 to 2017

  • Median result

    2.5pCi/L

    Below action level

    Randolph
    2.5 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    33

    26th of 27 by tests

    Randolph
    33
    Berkeley
    2,888

    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 WV

    11 of 27

    Middle half

    Randolph
    36.4%
    Morgan
    58.1%

    By share, of 27 with 30+ tests

Read a result for Randolph County

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

Interpret this readingWhat a fix costs

The data

Randolph County, At a glance

Randolph County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Randolph 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 97% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

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

Reported results by concentration band, Randolph County, 2008 to 2017, laboratory
Under 2 pCi/L: 46%2 to 4 pCi/L: 18%4 pCi/L and above: 36%

Of 33 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Randolph County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L1545.5%
2 to 4 pCi/L618.2%
4 pCi/L and above1236.4%
What these figures count

These are the 33 tests reported to CDC for Randolph 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

Randolph County, Compared

Randolph County radon figures, compared

Calculated by Radon411

In Randolph County, about 4 in 10 reported tests over the 2008 to 2017 laboratory totals (12 of 33) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 0.7 points higher. Across 55 West Virginia counties pooled together, 37.5% of tests reached that level, so Randolph County runs 1.1 points below its state.

Of 2 neighbours with a figure, none reported a larger share at or above 4 pCi/L; the spread is 9.8% (Grant County) to 30.9% (Pendleton County). By share, Randolph County is 11th of 27 West 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 11.2 pCi/L. Below the action level, 15 tests (45.5%) came in under 2 pCi/L, against 37.7% statewide, and 6 tests (18.2%) fell between 2 and 4, against 24.7% statewide.

Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 36.4% share point the same way here. USGS geology rates 97% of the county's land moderate radon potential.

CDC's ten-year totals for Randolph County went from 41 tests (2005 to 2014) to 33 (2008 to 2017), the share going from 36.6% to 36.4%.

Randolph County against West Virginia, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Randolph County
Randolph County3336.4%2.5 pCi/LThis county
West Virginia, pooled55 counties, pooled10,06137.5%Not pooled+1.1 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled−0.7 points
Morgan Countyhighest in the state24158.1%5.8 pCi/L+21.7 points
Wood Countylowest in the state90515.9%1.8 pCi/L−20.5 points
Pendleton County, WVborders it5530.9%2.5 pCi/L−5.5 points
Tucker County, WVborders it1827.8%1.8 pCi/L−8.6 points
Barbour County, WVborders it1225.0%2.0 pCi/L−11.4 points
Webster County, WVborders it1421.4%1.3 pCi/L−15.0 points
Upshur County, WVborders it2920.7%2.6 pCi/L−15.7 points
Pocahontas County, WVborders it1612.5%1.0 pCi/L−23.9 points
Grant County, WVborders it1649.8%1.1 pCi/L−26.6 points
Where Randolph County's reported results fell, 2008 to 2017, laboratory, beside West Virginia and the United States
ResultRandolph County testsRandolph County shareWest Virginia shareU.S. shareAgainst West Virginia
Under 2 pCi/L1545.5%37.7%39.6%+7.8 points
2 to 4 pCi/L618.2%24.7%24.7%−6.5 points
4 pCi/L and above1236.4%37.5%35.7%−1.1 points
Randolph County ranked among the 27 West 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
Mineral County7 of 2710742.1%2.8 pCi/L
Ohio County8 of 2785340.3%3.2 pCi/L
Hampshire County9 of 279038.9%2.8 pCi/L
Preston County10 of 2717636.9%2.5 pCi/L
Harrison County11 of 2718736.4%2.6 pCi/L
Randolph County11 of 273336.4%2.5 pCi/L
Wetzel County13 of 275435.2%2.7 pCi/L
Mercer County14 of 2710133.7%2.1 pCi/L
Marshall County15 of 2725431.9%2.5 pCi/L
Pendleton County16 of 275530.9%2.5 pCi/L
Marion County17 of 2724429.1%2.6 pCi/L
Randolph County ten-year laboratory totals, against West Virginia's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestWest Virginia, pooledChange from the row before
2008 to 20173336.4%2.5 pCi/L11.2 pCi/L37.5%+2.1 points
2007 to 20163534.3%2.1 pCi/L11.2 pCi/L37.3%−2.5 points
2006 to 20153836.8%2.8 pCi/L11.2 pCi/L37.7%+0.2 points
2005 to 20144136.6%2.8 pCi/L11.2 pCi/L37.3%First on file

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

Randolph County, Geology

The ground under Randolph County

Predicted

Most of the ground under Randolph County is one class on USGS's geologic map: 97.1% of its land is moderate radon potential, with 2.9% high. The map puts 85.3% of Randolph County in the area it calls Eastern Allegheny Plateau and Mtns and 11.8% in Southern Appalachian Valley and Ridge, 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 Randolph County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Eastern Allegheny Plateau and MtnsDevonian-Pennsylvanian shale, siltstone, sandstone, minor limestone and coalModerate1085.3%
Southern Appalachian Valley and RidgeOrdovician-Mississippian shale, siltstone, sandstone, limestone.Moderate1111.8%
Northern Appalachian Valley and RidgeSandstone ridges, shale and limestone valleys, mostly DevonianHigh142.9%

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

Randolph County beside the ground around it

West Virginia as a whole has more high-potential ground than Randolph County: 18.7% of its land, against 2.9% here. Of the 7 counties that border it, 3 have more high-potential ground, Pendleton County the most at 98.1%.

Share of land by USGS radon potential: Randolph County, the 7 counties bordering it and West Virginia
AreaEPA zoneLow potentialModerate potentialHigh potential
Randolph CountyZone 2None97.1%2.9%
Upshur CountyZone 2None100%None
Pendleton CountyZone 1None1.9%98.1%
Barbour CountyZone 2None100%None
Pocahontas CountyZone 1None53.3%46.7%
Tucker CountyZone 2None99.8%0.2%
Webster CountyZone 2None100%None
Grant CountyZone 1None24.5%75.5%
West Virginia55 counties, pooled by land areaVaries14.0%67.3%18.7%

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

Local help

Randolph County, Local resources

Radon testing and mitigation in Randolph County

What West Virginia's program says
Phone
304-352-5039
Email
Radon@wv.gov
Licensing of radon professionals
Complete listings of professionals licensed to perform Asbestos, Lead, Radon and Clandestine Drug Laboratory Remediation activities in West Virginia.

What it means

Randolph County, Questions

Questions about radon in Randolph County

Are radon levels high in Randolph County?

Over the 2008 to 2017 laboratory totals, 36.4% of the radon tests reported to CDC for Randolph County, West Virginia were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.5 pCi/L. Of 27 West Virginia counties with 30 or more tests for the same period, 10 reported a higher share; pooled, the state comes to 37.5%.

Which counties border Randolph County?

Randolph County borders 7 counties: Upshur County, Pendleton County, Barbour County, Pocahontas County, Tucker County, Webster County and Grant County.

Products

Randolph County, Products

Testing a home in Randolph County

In Randolph County, 36.4% of 33 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 37.5% pooled across West Virginia. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Randolph County; a long-term test tells the year-round average.

Test kits and monitors3

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Best radon monitors for Randolph County homes, compared

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Randolph County, Bordering counties

Counties bordering Randolph County

Calculated by Radon411

Randolph County, Cities and towns

Cities and towns in Randolph County

About 26,882 people live in Randolph County by the Census Bureau's estimate for July 1, 2025, 1,011 fewer than in 2020 (−3.6%). That works out to 26 people per square mile of land. Its largest town, Elkins, has 6,622 residents, 24.6% of the total. Together its 7 incorporated places hold 30.8% of those residents; the other 69.2% live outside any of them. Reported testing is thin here: 33 tests over 2008 to 2017, or 1.2 for every 1,000 residents (2025 estimate), where West Virginia as a whole comes to 5.7.

From Elkins to Harman, CDC publishes no figure by town: each reads Randolph County's.

The cities and towns in Randolph County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Elkins6,622−4.3%24.6%
Beverly567−4.9%2.1%
Mill Creek532−4.0%2.0%
Womelsdorf (Coalton)182−1.6%0.7%
Huttonsville155−3.7%0.6%
Montrose133−4.3%0.5%
Harman91−4.2%0.3%

7 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).

Randolph County, Homes

Homes in Randolph County

Of Randolph County's 13,090 homes, 69% are detached houses, against 71% across West Virginia; 19% are mobile homes. Half of its homes were built before 1975, close to West Virginia's 1976: 34% date from before 1960 and 14% from 2000 or later. Owners live in 77% of the occupied homes (West Virginia: 74%), so for most households a test and a fix are their own to order.

Homes in Randolph County, West Virginia, 2019 to 2023
HomesRandolph CountyWest Virginia
Housing units13,090859,653
Detached houses69%71%
In buildings of 5 or more4%8%
Mobile homes19%14%
Built before 196034%33%
Built since 200014%18%
Middle year built19751976
Owner-occupied77%74%

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