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Radon Levels in Mineral County, West Virginia

EPA puts Mineral County in Zone 1, its highest radon zone, and high results are common there: 42.1% of the 107 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

    42.1%

    4.6 pts above WV

    Mineral
    42.1%
    WV
    37.5%

    107 tests, 2008 to 2017

  • Median result

    2.8pCi/L

    Below action level

    Mineral
    2.8 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    107

    17th of 27 by tests

    Mineral
    107
    Berkeley
    2,888

    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 WV

    7 of 27

    Top quarter

    Mineral
    42.1%
    Morgan
    58.1%

    By share, of 27 with 30+ tests

Read a result for Mineral County

Starts at Mineral County's median, 2.8 pCi/L

2.8pCi/L

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

EPA’s reading of 2.8 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. Mineral County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Mineral County, At a glance

Mineral County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Mineral 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 84% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

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

Reported results by concentration band, Mineral County, 2008 to 2017, laboratory
Under 2 pCi/L: 37%2 to 4 pCi/L: 21%4 pCi/L and above: 42%

Of 107 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Mineral County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L4037.4%
2 to 4 pCi/L2220.6%
4 pCi/L and above4542.1%
What these figures count

These are the 107 tests reported to CDC for Mineral 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

Mineral County, Compared

Mineral County radon figures, compared

Calculated by Radon411

In Mineral County, about 4 in 10 reported tests over the 2008 to 2017 laboratory totals (45 of 107) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 6.4 points higher. Across 55 West Virginia counties pooled together, 37.5% of tests reached that level, so Mineral County runs 4.6 points above its state.

Of 5 neighbours with a figure, none reported a larger share at or above 4 pCi/L; the spread is 9.8% (Grant County) to 38.9% (Hampshire County). By share, Mineral County is 7th of 27 West Virginia counties with 30 or more tests for the same period.

Half the tests came in under 2.8 pCi/L and half over it; the single highest reached 79.7 pCi/L. Below the action level, 40 tests (37.4%) came in under 2 pCi/L, against 37.7% statewide, and 22 tests (20.6%) fell between 2 and 4, against 24.7% statewide.

Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 42.1% share point the same way here. USGS geology rates 84% of the county's land high radon potential.

CDC's ten-year totals for Mineral County went from 80 tests (2005 to 2014) to 107 (2008 to 2017), the share going from 38.8% to 42.1%.

Mineral County against West Virginia, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Mineral County
Mineral County10742.1%2.8 pCi/LThis county
West Virginia, pooled55 counties, pooled10,06137.5%Not pooled−4.6 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled−6.4 points
Morgan Countyhighest in the state24158.1%5.8 pCi/L+16.0 points
Wood Countylowest in the state90515.9%1.8 pCi/L−26.2 points
Hampshire County, WVborders it9038.9%2.8 pCi/L−3.2 points
Garrett County, MDborders it18737.4%3.0 pCi/L−4.7 points
Allegany County, MDborders it28635.7%2.7 pCi/L−6.4 points
Hardy County, WVborders it5322.6%1.6 pCi/L−19.5 points
Grant County, WVborders it1649.8%1.1 pCi/L−32.3 points
Where Mineral County's reported results fell, 2008 to 2017, laboratory, beside West Virginia and the United States
ResultMineral County testsMineral County shareWest Virginia shareU.S. shareAgainst West Virginia
Under 2 pCi/L4037.4%37.7%39.6%−0.3 points
2 to 4 pCi/L2220.6%24.7%24.7%−4.1 points
4 pCi/L and above4542.1%37.5%35.7%+4.6 points
Mineral 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
Jefferson County2 of 2789853.2%4.4 pCi/L
Greenbrier County3 of 2717652.3%4.5 pCi/L
Berkeley County4 of 272,88850.7%4.0 pCi/L
Hancock County5 of 2732649.1%3.9 pCi/L
Brooke County6 of 2715743.9%3.4 pCi/L
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
Mineral 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 201710742.1%2.8 pCi/L79.7 pCi/L37.5%+1.2 points
2007 to 20169340.9%2.7 pCi/L71.9 pCi/L37.3%Level
2006 to 20158840.9%2.7 pCi/L71.9 pCi/L37.7%+2.1 points
2005 to 20148038.8%2.5 pCi/L71.9 pCi/L37.3%First on file

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

Mineral County, Geology

The ground under Mineral County

Predicted

Most of the ground under Mineral County is one class on USGS's geologic map: 84.2% of its land is high radon potential, with 15.8% moderate. The map puts 83.9% of Mineral County in the area it calls Northern Appalachian Valley and Ridge and 15.5% in Eastern Allegheny Plateau and Mtns. USGS gives the first a radon index of 14, in the high band (12 to 17), and the second 10, in the moderate band (9 to 11).

USGS's geologic areas under Mineral County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Northern Appalachian Valley and RidgeSandstone ridges, shale and limestone valleys, mostly DevonianHigh1483.9%
Eastern Allegheny Plateau and MtnsDevonian-Pennsylvanian shale, siltstone, sandstone, minor limestone and coalModerate1015.5%

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

Mineral County beside the ground around it

Mineral County has more high-potential ground than West Virginia as a whole: 84.2% of its land against 18.7%. Of the 5 counties that border it, 2 have more high-potential ground, Hampshire County the most at 100%.

Share of land by USGS radon potential: Mineral County, the 5 counties bordering it and West Virginia
AreaEPA zoneLow potentialModerate potentialHigh potential
Mineral CountyZone 1None15.8%84.2%
Garrett County, MDZone 2None100%None
Hampshire CountyZone 1NoneNone100%
Allegany County, MDZone 2None19.5%80.5%
Grant CountyZone 1None24.5%75.5%
Hardy CountyZone 1NoneNone100%
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

Mineral County, Local resources

Radon testing and mitigation in Mineral 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

Mineral County, Questions

Questions about radon in Mineral County

Are radon levels high in Mineral County?

Over the 2008 to 2017 laboratory totals, 42.1% of the radon tests reported to CDC for Mineral County, West Virginia were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.8 pCi/L. Of 27 West Virginia counties with 30 or more tests for the same period, 6 reported a higher share; pooled, the state comes to 37.5%.

Which counties border Mineral County?

Mineral County borders 5 counties: Garrett County, MD, Hampshire County, WV, Allegany County, MD, Grant County, WV and Hardy County, WV.

Products

Mineral County, Products

Testing a home in Mineral County

In Mineral County, 42.1% of 107 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 37.5% pooled across West Virginia. In Zone 1 the year-round level in Mineral 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

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

Explore

Mineral County, Bordering counties

Counties bordering Mineral County

Calculated by Radon411

Mineral County, Cities and towns

Cities and towns in Mineral County

Mineral County's population has barely moved since 2020: 26,792 residents on July 1, 2025 against 26,892 then, by the Census Bureau's estimates. That works out to 82 people per square mile of land. No town dominates: Keyser, the largest, has 4,777 residents, 17.8% of the total. Together its 5 incorporated places hold 26.4% of those residents; the other 73.6% live outside any of them. CDC's 107 reported tests for 2008 to 2017 work out to 4.0 per 1,000 residents (2025 estimate), close to West Virginia's 5.7.

From Keyser to Elk Garden, CDC publishes no figure by town: each reads Mineral County's.

The cities and towns in Mineral County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Keyser4,777−1.6%17.8%
Carpendale824−2.5%3.1%
Piedmont691−3.1%2.6%
Ridgeley570−3.2%2.1%
Elk Garden209−2.3%0.8%

5 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).

Mineral County, Homes

Homes in Mineral County

Of Mineral County's 12,526 homes, 75% are detached houses, against 71% across West Virginia; 11% are mobile homes. Half of its homes were built before 1976, close to West Virginia's 1976: 25% date from before 1960 and 12% from 2000 or later. Owners live in 80% of the occupied homes (West Virginia: 74%), so for most households a test and a fix are their own to order.

Homes in Mineral County, West Virginia, 2019 to 2023
HomesMineral CountyWest Virginia
Housing units12,526859,653
Detached houses75%71%
In buildings of 5 or more5%8%
Mobile homes11%14%
Built before 196025%33%
Built since 200012%18%
Middle year built19761976
Owner-occupied80%74%

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