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Radon Levels in Hardy County, West Virginia

EPA puts Hardy County in Zone 1, its highest radon zone, and 22.6% of its 53 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

    22.6%

    14.9 pts below WV

    Hardy
    22.6%
    WV
    37.5%

    53 tests, 2008 to 2017

  • Median result

    1.6pCi/L

    Below action level

    Hardy
    1.6 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    53

    22nd of 27 by tests

    Hardy
    53
    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

    21 of 27

    Lowest quarter

    Hardy
    22.6%
    Morgan
    58.1%

    By share, of 27 with 30+ tests

Read a result for Hardy County

Starts at Hardy County's median, 1.6 pCi/L

1.6pCi/L

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

EPA’s reading of 1.6 pCi/L

Below 2 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 below 2 pCi/L, the level at which EPA says a fix should be considered. Hardy County's median reported result, 2008 to 2017.

Interpret this reading

The data

Hardy County, At a glance

Hardy County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Hardy 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 100% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

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

Reported results by concentration band, Hardy County, 2008 to 2017, laboratory
Under 2 pCi/L: 55%2 to 4 pCi/L: 23%4 pCi/L and above: 22%

Of 53 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Hardy County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L2954.7%
2 to 4 pCi/L1222.6%
4 pCi/L and above1222.6%
What these figures count

These are the 53 tests reported to CDC for Hardy 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

Hardy County, Compared

Hardy County radon figures, compared

Calculated by Radon411

Hardy County's 53 reported tests over the 2008 to 2017 laboratory totals had a middle value of 1.6 pCi/L and a maximum of 17.8 pCi/L, and 22.6% reached 4 pCi/L. West Virginia as a whole (55 West Virginia counties, pooled) comes to 37.5%: 14.9 points higher than here.

Among its state's counties it ranks 21st of 27 West Virginia counties with 30 or more tests for the same period. Statewide for the same period, Morgan County reported the highest share (58.1%) and Grant County the lowest (9.8%).

Below the action level, 29 tests (54.7%) came in under 2 pCi/L, against 37.7% statewide, and 12 tests (22.6%) fell between 2 and 4, against 24.7% statewide. CDC's ten-year totals for Hardy County went from 51 tests (2005 to 2014) to 53 (2008 to 2017), the share going from 29.4% to 22.6%.

EPA's 1993 zone map puts Hardy County in Zone 1, a predicted county average above 4 pCi/L. USGS geology rates 100% of the county's land high radon potential.

Next door, the shares run from 9.8% in Grant County to 44.1% in Frederick County, VA, with Grant County below Hardy County.

Hardy County against West Virginia, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Hardy County
Hardy County5322.6%1.6 pCi/LThis county
West Virginia, pooled55 counties, pooled10,06137.5%Not pooled+14.9 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+13.1 points
Morgan Countyhighest in the state24158.1%5.8 pCi/L+35.5 points
Wood Countylowest in the state90515.9%1.8 pCi/L−6.7 points
Frederick County, VAborders it2,45144.1%3.3 pCi/L+21.5 points
Rockingham County, VAborders it1,71443.9%3.3 pCi/L+21.3 points
Mineral County, WVborders it10742.1%2.8 pCi/L+19.5 points
Hampshire County, WVborders it9038.9%2.8 pCi/L+16.3 points
Shenandoah County, VAborders it39036.4%2.7 pCi/L+13.8 points
Pendleton County, WVborders it5530.9%2.5 pCi/L+8.3 points
Grant County, WVborders it1649.8%1.1 pCi/L−12.8 points
Where Hardy County's reported results fell, 2008 to 2017, laboratory, beside West Virginia and the United States
ResultHardy County testsHardy County shareWest Virginia shareU.S. shareAgainst West Virginia
Under 2 pCi/L2954.7%37.7%39.6%+17.0 points
2 to 4 pCi/L1222.6%24.7%24.7%−2.1 points
4 pCi/L and above1222.6%37.5%35.7%−14.9 points
Hardy 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
Pendleton County16 of 275530.9%2.5 pCi/L
Marion County17 of 2724429.1%2.6 pCi/L
Taylor County18 of 273228.1%2.2 pCi/L
Putnam County19 of 275223.1%1.5 pCi/L
Tyler County20 of 273522.9%1.8 pCi/L
Hardy County21 of 275322.6%1.6 pCi/L
Kanawha County22 of 2724720.6%2.2 pCi/L
Monongalia County23 of 271,17619.0%1.9 pCi/L
Raleigh County24 of 274216.7%1.4 pCi/L
Cabell County25 of 2714516.6%2.0 pCi/L
Wood County26 of 2790515.9%1.8 pCi/L
Hardy 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 20175322.6%1.6 pCi/L17.8 pCi/L37.5%−3.8 points
2007 to 20165326.4%1.6 pCi/L20.0 pCi/L37.3%−3.2 points
2006 to 20155429.6%1.8 pCi/L20.0 pCi/L37.7%+0.2 points
2005 to 20145129.4%1.6 pCi/L20.0 pCi/L37.3%First on file

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

Hardy County, Geology

The ground under Hardy County

Predicted

USGS's geologic map puts all of Hardy County's mapped land in one class: high radon potential. All of it lies in the area the map calls Northern Appalachian Valley and Ridge, to which USGS gives a radon index of 14, in the high band (12 to 17).

USGS's geologic areas under Hardy County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Northern Appalachian Valley and RidgeSandstone ridges, shale and limestone valleys, mostly DevonianHigh1499.6%

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

Hardy County beside the ground around it

Hardy County has more high-potential ground than West Virginia as a whole: 100% of its land against 18.7%. Of the 7 counties that border it, none has as large a share of high-potential ground; Hampshire County comes nearest at 100%.

Share of land by USGS radon potential: Hardy County, the 7 counties bordering it and West Virginia
AreaEPA zoneLow potentialModerate potentialHigh potential
Hardy CountyZone 1NoneNone100%
Shenandoah County, VAZone 1NoneNone100%
Grant CountyZone 1None24.5%75.5%
Hampshire CountyZone 1NoneNone100%
Mineral CountyZone 1None15.8%84.2%
Rockingham County, VAZone 1None4.8%95.2%
Frederick County, VAZone 1NoneNone100%
Pendleton CountyZone 1None1.9%98.1%
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

Hardy County, Local resources

Radon testing and mitigation in Hardy 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

Hardy County, Questions

Questions about radon in Hardy County

Are radon levels high in Hardy County?

Over the 2008 to 2017 laboratory totals, 22.6% of the radon tests reported to CDC for Hardy County, West Virginia were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.6 pCi/L. Of 27 West Virginia counties with 30 or more tests for the same period, 20 reported a higher share; pooled, the state comes to 37.5%.

Which counties border Hardy County?

Hardy County borders 7 counties: Shenandoah County, VA, Grant County, WV, Hampshire County, WV, Mineral County, WV, Rockingham County, VA, Frederick County, VA and Pendleton County, WV.

Products

Hardy County, Products

Testing a home in Hardy County

In Hardy County, 22.6% of 53 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 Hardy 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

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

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Hardy County, Bordering counties

Counties bordering Hardy County

Calculated by Radon411

Hardy County, Cities and towns

Cities and towns in Hardy County

The Census Bureau estimates 14,337 residents in Hardy County for July 1, 2025, 96 more than in 2020 (+0.7%). That works out to 25 people per square mile of land. No town dominates: Moorefield, the largest, has 2,655 residents, 18.5% of the total. Together its 2 incorporated places hold 20.3% of those residents; the other 79.7% live outside any of them. Reported testing is thin here: 53 tests over 2008 to 2017, or 3.7 for every 1,000 residents (2025 estimate), where West Virginia as a whole comes to 5.7.

From Moorefield to Wardensville, CDC publishes no figure by town: each reads Hardy County's.

The cities and towns in Hardy County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Moorefield2,655+5.7%18.5%
Wardensville260−1.5%1.8%

2 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).

Hardy County, Homes

Homes in Hardy County

Hardy County is a place of houses on their own lots: 80% of its 8,217 homes are detached single-family houses, against 71% across West Virginia. Much of Hardy County is recent building: 23% of its homes have gone up since 2000 and the middle year built is 1984, against 1976 for West Virginia. 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 Hardy County, West Virginia, 2019 to 2023
HomesHardy CountyWest Virginia
Housing units8,217859,653
Detached houses80%71%
In buildings of 5 or more2%8%
Mobile homes16%14%
Built before 196020%33%
Built since 200023%18%
Middle year built19841976
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.