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Radon Levels in Monongalia County, West Virginia

EPA puts Monongalia County in Zone 1, its highest radon zone, and 19.0% of its 1,176 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

    19.0%

    18.5 pts below WV

    Monongalia
    19.0%
    WV
    37.5%

    1,176 tests, 2008 to 2017

  • Median result

    1.9pCi/L

    Below action level

    Monongalia
    1.9 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    1,176

    2nd of 27 by tests

    Monongalia
    1,176
    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

    23 of 27

    Lowest quarter

    Monongalia
    19.0%
    Morgan
    58.1%

    By share, of 27 with 30+ tests

Read a result for Monongalia County

Starts at Monongalia County's median, 1.9 pCi/L

1.9pCi/L

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

EPA’s reading of 1.9 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. Monongalia County's median reported result, 2008 to 2017.

Interpret this reading

The data

Monongalia County, At a glance

Monongalia County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Monongalia 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: Moderate across 100% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

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

Reported results by concentration band, Monongalia County, 2008 to 2017, laboratory
Under 2 pCi/L: 51%2 to 4 pCi/L: 30%4 pCi/L and above: 19%

Of 1,176 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Monongalia County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L60451.4%
2 to 4 pCi/L34829.6%
4 pCi/L and above22419.0%
What these figures count

These are the 1,176 tests reported to CDC for Monongalia 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

Monongalia County, Compared

Monongalia County radon figures, compared

Calculated by Radon411

Monongalia County's 1,176 reported tests over the 2008 to 2017 laboratory totals had a middle value of 1.9 pCi/L and a maximum of 50.0 pCi/L, and 19.0% reached 4 pCi/L. West Virginia as a whole (55 West Virginia counties, pooled) comes to 37.5%: 18.5 points higher than here.

Among its state's counties it ranks 23rd 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, 604 tests (51.4%) came in under 2 pCi/L, against 37.7% statewide, and 348 tests (29.6%) fell between 2 and 4, against 24.7% statewide. CDC's ten-year totals for Monongalia County went from 1,018 tests (2005 to 2014) to 1,176 (2008 to 2017), the share going from 18.9% to 19.0%.

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

Next door, the shares run from 28.1% in Taylor County to 39.0% in Greene County, PA.

CDC also counts 143 tests taken after mitigation in Monongalia County for the same period: tests in homes where a fix was already in.

Monongalia County against West Virginia, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Monongalia County
Monongalia County1,17619.0%1.9 pCi/LThis county
West Virginia, pooled55 counties, pooled10,06137.5%Not pooled+18.5 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+16.7 points
Morgan Countyhighest in the state24158.1%5.8 pCi/L+39.1 points
Grant Countylowest in the state1649.8%1.1 pCi/L−9.2 points
Greene County, PAborders it15439.0%3.3 pCi/L+20.0 points
Preston County, WVborders it17636.9%2.5 pCi/L+17.9 points
Fayette County, PAborders it58335.8%2.8 pCi/L+16.8 points
Wetzel County, WVborders it5435.2%2.7 pCi/L+16.2 points
Marion County, WVborders it24429.1%2.6 pCi/L+10.1 points
Taylor County, WVborders it3228.1%2.2 pCi/L+9.1 points
Where Monongalia County's reported results fell, 2008 to 2017, laboratory, beside West Virginia and the United States
ResultMonongalia County testsMonongalia County shareWest Virginia shareU.S. shareAgainst West Virginia
Under 2 pCi/L60451.4%37.7%39.6%+13.7 points
2 to 4 pCi/L34829.6%24.7%24.7%+4.9 points
4 pCi/L and above22419.0%37.5%35.7%−18.5 points
Monongalia 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
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
Grant County27 of 271649.8%1.1 pCi/L
Monongalia 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 20171,17619.0%1.9 pCi/L50.0 pCi/L37.5%+0.4 points
2007 to 20161,15518.6%1.9 pCi/L50.0 pCi/L37.3%−0.6 points
2006 to 20151,07219.2%1.9 pCi/L50.0 pCi/L37.7%+0.3 points
2005 to 20141,01818.9%1.8 pCi/L50.0 pCi/L37.3%First on file

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

Monongalia County, Geology

The ground under Monongalia County

Predicted

USGS's geologic map puts all of Monongalia County's mapped land in one class: moderate radon potential. The map puts 67.1% of Monongalia County in the area it calls Central Allegheny Plateau and 25.0% in Eastern Allegheny Plateau and Mtns, with one smaller area beside them. USGS gives both a radon index of 10, in the moderate band (9 to 11).

USGS's geologic areas under Monongalia County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Central Allegheny PlateauPermian and Pennsylvanian shale, siltstone, sandstone, minor limestone.Moderate1067.1%
Eastern Allegheny Plateau and MtnsDevonian-Pennsylvanian shale, siltstone, sandstone, minor limestone and coalModerate1025.0%
Permian Rocks of the Pittsburgh Low PlateauPermian sandstone, shale, limestone, and coal.Moderate118.0%

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

Monongalia County beside the ground around it

Across West Virginia 18.7% of the land is rated high; none of Monongalia County's is. Of the 6 counties that border it, 2 have more high-potential ground, Fayette County, PA the most at 44.2%.

Share of land by USGS radon potential: Monongalia County, the 6 counties bordering it and West Virginia
AreaEPA zoneLow potentialModerate potentialHigh potential
Monongalia CountyZone 1None100%None
Taylor CountyZone 2None100%None
Preston CountyZone 1None100%None
Marion CountyZone 2None100%None
Greene County, PAZone 2None92.3%7.7%
Fayette County, PAZone 2None55.8%44.2%
Wetzel CountyZone 1None100%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

Monongalia County, Local resources

Radon testing and mitigation in Monongalia County

Listed radon businesses with an address in Monongalia County:

Listed radon professionals by town: Morgantown

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

Monongalia County, Questions

Questions about radon in Monongalia County

Are radon levels high in Monongalia County?

Over the 2008 to 2017 laboratory totals, 19.0% of the radon tests reported to CDC for Monongalia County, West Virginia were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.9 pCi/L. Of 27 West Virginia counties with 30 or more tests for the same period, 22 reported a higher share; pooled, the state comes to 37.5%.

Which counties border Monongalia County?

Monongalia County borders 6 counties: Taylor County, WV, Preston County, WV, Marion County, WV, Greene County, PA, Fayette County, PA and Wetzel County, WV.

Products

Monongalia County, Products

Testing a home in Monongalia County

In Monongalia County, 19.0% of 1,176 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 Monongalia 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

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

Explore

Monongalia County, Bordering counties

Counties bordering Monongalia County

Calculated by Radon411

Monongalia County, Cities and towns

Cities and towns in Monongalia County

The Census Bureau estimates 107,991 residents in Monongalia County for July 1, 2025, 2,074 more than in 2020 (+2.0%). That works out to 300 people per square mile of land. Its largest town, Morgantown, has 30,293 residents, 28.1% of the total. Together its 5 incorporated places hold 34.9% of those residents; the other 65.1% live outside any of them. Testing is reported here more often than across the state: CDC's 1,176 reported tests for 2008 to 2017 come to 10.9 for every 1,000 residents (2025 estimate), against 5.7 for West Virginia.

From Morgantown to Blacksville, CDC publishes no figure by town: each reads Monongalia County's.

The cities and towns in Monongalia County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Morgantown30,293+0.8%28.1%
Westover4,086+2.9%3.8%
Star City1,795+1.4%1.7%
Granville1,362+1.3%1.3%
Blacksville119Level0.1%

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).

Monongalia County, Homes

Homes in Monongalia County

Fewer than six in ten of Monongalia County's 49,795 homes are detached houses (50%, against 71% across West Virginia); the rest are attached, in shared buildings or mobile. Much of Monongalia County is recent building: 34% of its homes have gone up since 2000 and the middle year built is 1988, against 1976 for West Virginia. 58% of occupied homes are lived in by their owner (West Virginia: 74%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Monongalia County, West Virginia, 2019 to 2023
HomesMonongalia CountyWest Virginia
Housing units49,795859,653
Detached houses50%71%
In buildings of 5 or more24%8%
Mobile homes8%14%
Built before 196023%33%
Built since 200034%18%
Middle year built19881976
Owner-occupied58%74%

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