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Radon Levels in Calhoun County, West Virginia

EPA puts Calhoun County in Zone 2, its middle radon zone, and only 4 radon tests from it are on file with CDC (2008 to 2017, laboratory totals). Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

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  • Nearest county

    15.9%

    Wood County, 33 miles

    Wood
    15.9%
    WV
    37.5%

    Share at 4+ pCi/L, 905 tests, 2008 to 2017

  • Ground above low

    100.0%

    14.0 pts above WV

    Calhoun
    100.0%
    WV
    86.0%

    Share of land USGS rates moderate or high potential

  • Tests reported

    6

    Too few for a share

    Calhoun
    6
    Needed
    30

    2005 to 2014, laboratory

  • 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

Read a result for Calhoun County

Starts at EPA's action level

4.0pCi/L

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

EPA’s reading of 4.0 pCi/L

At or above 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 at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher.

Interpret this readingWhat a fix costs

The data

Calhoun County, At a glance

Calhoun County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Calhoun 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 Calhoun County, 2008 to 2017, laboratory

CDC holds 4 reported tests for Calhoun County over the 2008 to 2017 laboratory totals, with a median of 2.4 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Calhoun County beside the counties around it is how this page reads it.

What these figures count

Only 4 tests were reported to CDC for Calhoun County over 2008 to 2017 (laboratory totals), and tests are often run on homes being sold or already suspected of a problem: so few describe neither the county nor 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

Calhoun County, Compared

Calhoun County radon figures, compared

Calculated by Radon411

CDC's largest figure for Calhoun County rests on 6 tests over the 2005 to 2014 laboratory totals, 2 of them at or above 4 pCi/L, so each test moves its share by 16.7 points and no rank or comparison is drawn from it. Results reached as high as 8.7 pCi/L, with a middle value of 3.2 pCi/L.

The nearest counties with a figure are Wood County (33 miles away) at 15.9%, Kanawha County (41 miles away) at 20.6% and Tyler County (45 miles away) at 22.9%. Pooled across 55 West Virginia counties, 37.5% of reported tests reached that level; across every county in the country with a figure, 35.7%.

Statewide for the same period, Morgan County reported the highest share (58.1%) and Grant County the lowest (9.8%). EPA's 1993 map puts Calhoun County in Zone 2, its middle label: a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land moderate radon potential.

West Virginia, the United States and the counties around Calhoun County, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedian
West Virginia, pooled55 counties, pooled10,06137.5%Not pooled
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled
Morgan Countyhighest in the state24158.1%5.8 pCi/L
Grant Countylowest in the state1649.8%1.1 pCi/L
Roane County, WVborders it2236.4%2.3 pCi/L
Braxton County, WVborders it1225.0%1.3 pCi/L
Gilmer County, WVborders it812.5%2.1 pCi/L
Ritchie County, WVborders it185.6%1.9 pCi/L
Clay County, WVborders it10.0%0.1 pCi/L
Wirt County, WVborders it80.0%1.6 pCi/L
The nearest West Virginia counties to Calhoun County with 30 or more tests, 2008 to 2017, laboratory
CountyDistanceTestsAt or above 4 pCi/LMedian
Wood County33 mi90515.9%1.8 pCi/L
Kanawha County41 mi24720.6%2.2 pCi/L
Tyler County45 mi3522.9%1.8 pCi/L
Putnam County49 mi5223.1%1.5 pCi/L
Harrison County50 mi18736.4%2.6 pCi/L
Wetzel County58 mi5435.2%2.7 pCi/L
Marion County66 mi24429.1%2.6 pCi/L
Taylor County67 mi3228.1%2.2 pCi/L
Calhoun 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 201740.0%2.4 pCi/L3.3 pCi/L37.5%Level
2007 to 201640.0%2.4 pCi/L3.3 pCi/L37.3%Level
2006 to 201540.0%2.4 pCi/L3.3 pCi/L37.7%−33.3 points
2005 to 2014633.3%3.2 pCi/L8.7 pCi/L37.3%First on file

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

Calhoun County, Geology

The ground under Calhoun County

Predicted

USGS's geologic map puts all of Calhoun County's mapped land in one class: moderate radon potential. All of it lies in the area the map calls Central Allegheny Plateau, to which USGS gives a radon index of 10, in the moderate band (9 to 11).

USGS's geologic areas under Calhoun County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Central Allegheny PlateauPermian and Pennsylvanian shale, siltstone, sandstone, minor limestone.Moderate10100%

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

Calhoun County beside the ground around it

Across West Virginia 18.7% of the land is rated high; none of Calhoun County's is. Of the 6 counties that border it, none has as large a share of moderate-potential ground; Braxton County comes nearest at 100%.

Share of land by USGS radon potential: Calhoun County, the 6 counties bordering it and West Virginia
AreaEPA zoneLow potentialModerate potentialHigh potential
Calhoun CountyZone 2None100%None
Roane CountyZone 2None100%None
Gilmer CountyZone 2None100%None
Wirt CountyZone 2None100%None
Braxton CountyZone 2None100%None
Ritchie CountyZone 2None100%None
Clay CountyZone 21.7%98.3%None
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

Calhoun County, Local resources

Radon testing and mitigation in Calhoun 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

Calhoun County, Questions

Questions about radon in Calhoun County

Are radon levels high in Calhoun County?

Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Calhoun County, West Virginia were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.4 pCi/L. Of the 8 nearest counties with a figure, within 67 miles, the share of tests at or above 4 pCi/L runs from 15.9% to 36.4%.

Which counties border Calhoun County?

Calhoun County borders 6 counties: Roane County, Gilmer County, Wirt County, Braxton County, Ritchie County and Clay County.

Products

Calhoun County, Products

Testing a home in Calhoun County

No CDC figure names Calhoun County; the nearest county with one, Wood County (33 miles away), reported 15.9% of its tests at or above 4 pCi/L over the 2008 to 2017 laboratory totals, the only reading nearby until a test of this home. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Calhoun County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Calhoun County homes, compared

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Calhoun County, Bordering counties

Counties bordering Calhoun County

Calculated by Radon411

Calhoun County, Cities and towns

Cities and towns in Calhoun County

About 5,978 people live in Calhoun County by the Census Bureau's estimate for July 1, 2025, 225 fewer than in 2020 (−3.6%). That works out to 21 people per square mile of land. Grantsville, its one incorporated place, has 475 residents, 7.9% of the total. Reported testing is thin here: 6 tests over 2005 to 2014, or 1.0 for every 1,000 residents (2025 estimate), where West Virginia as a whole comes to 5.1.

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

Grantsville, Calhoun County: residents on July 1, 2025
PlaceResidentsSince 2020Share of residents
Grantsville475−3.7%7.9%

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).

Calhoun County, Homes

Homes in Calhoun County

Of Calhoun County's 3,199 homes, 70% are detached houses, against 71% across West Virginia; 27% are mobile homes. Half of its homes were built before 1974, close to West Virginia's 1976: 33% date from before 1960 and 15% from 2000 or later. Owners live in 82% of the occupied homes (West Virginia: 74%), so for most households a test and a fix are their own to order.

Homes in Calhoun County, West Virginia, 2019 to 2023
HomesCalhoun CountyWest Virginia
Housing units3,199859,653
Detached houses70%71%
In buildings of 5 or more2%8%
Mobile homes27%14%
Built before 196033%33%
Built since 200015%18%
Middle year built19741976
Owner-occupied82%74%

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