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Radon Levels in Fayette County, Pennsylvania

EPA puts Fayette County in Zone 2, its middle radon zone, and 17.4% of its 287 reported radon tests (2020) 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

How to test this homeFind a certified tester

  • Share at 4+ pCi/L

    17.4%

    12.9 pts below PA

    Fayette
    17.4%
    PA
    30.3%

    287 tests, 2020

  • Median result

    1.8pCi/L

    Below action level

    Fayette
    1.8 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2020

  • Tests reported

    287

    36th of 63 by tests

    Fayette
    287
    Montgomery
    10,508

    Reported to CDC before any fix, 2020

  • 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 PA

    61 of 63

    Lowest quarter

    Fayette
    17.4%
    Perry
    57.7%

    By share, of 63 with 30+ tests

Read a result for Fayette County

Starts at Fayette County's median, 1.8 pCi/L

1.8pCi/L

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

EPA’s reading of 1.8 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. Fayette County's median reported result, 2020.

Interpret this reading

The data

Fayette County, At a glance

Fayette County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Fayette 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 56% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Fayette County, 2020

Share of reported tests at or above 4 pCi/L, by year, Fayette County
Share of reported tests at or above 4 pCi/L, by year, Fayette County
YearShare of reported tests at or above 4 pCi/L
201428.2%
201535.7%
201634.8%
201741.4%
201828.7%
201931.0%
202017.4%

2020: 17.4%. Across these years the share ran from 17.4% to 41.4%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

These are the 287 tests reported to CDC for Fayette County over 2020, 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: 2020. Measured data period: 2005 to 2020 (every CDC figure on file).

How to read these figures

Fayette County, Compared

Fayette County radon figures, compared

Calculated by Radon411

Fayette County's 287 reported tests in 2020 had a middle value of 1.8 pCi/L and a maximum of 33.9 pCi/L, and 17.4% reached 4 pCi/L. Pennsylvania as a whole (67 Pennsylvania counties, pooled) comes to 30.3%: 12.9 points higher than here.

Among its state's counties it ranks 61st of 63 Pennsylvania counties with 30 or more tests for the same period. Statewide for the same period, Perry County reported the highest share (57.7%) and Philadelphia County the lowest (10.6%).

Below the action level, 155 tests (54.0%) came in under 2 pCi/L, against 44.3% statewide, and 82 tests (28.6%) fell between 2 and 4, against 25.4% statewide. The busiest year on file was 2020, with 287 tests reported; the quietest, 2018, had 122.

EPA's 1993 zone map puts Fayette County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 56% of the county's land moderate radon potential.

Next door, the shares run from 20.0% in Greene County to 43.7% in Somerset County. Over 7 years of annual figures the share fell 10.8 points, from 28.2% in 2014 to 17.4% in 2020; its peak was 41.4% in 2017.

Share of reported tests at or above 4 pCi/L by year, Fayette County against Pennsylvania2014 to 2020, years with 30 or more tests: Fayette County 28.2% to 17.4%, the state's pooled share 30.3% in 2020.
Fayette CountyPennsylvania, pooled
Share of reported tests at or above 4 pCi/L by year, Fayette County against Pennsylvania: data table
YearTestsFayette County, at or above 4 pCi/LPennsylvania, pooled
201420628.2%36.1%
201522135.7%37.8%
201622134.8%34.4%
201718141.4%35.1%
201812228.7%30.5%
201927731.0%31.4%
202028717.4%30.3%
Fayette County against Pennsylvania, the United States and nearby counties, 2020
AreaTestsAt or above 4 pCi/LMedianDifference from Fayette County
Fayette County28717.4%1.8 pCi/LThis county
Pennsylvania, pooled67 counties, pooled93,66930.3%Not pooled+12.9 points
United States, pooled915 counties, pooled405,35525.5%Not pooled+8.1 points
Perry Countyhighest in the state18957.7%4.9 pCi/L+40.3 points
Philadelphia Countylowest in the state8,44210.6%1.7 pCi/L−6.8 points
Somerset County, PAborders it12643.7%3.7 pCi/L+26.3 points
Westmoreland County, PAborders it1,58834.9%2.6 pCi/L+17.5 points
Washington County, PAborders it1,22733.6%2.8 pCi/L+16.2 points
Greene County, PAborders it4520.0%3.2 pCi/L+2.6 points
Where Fayette County's reported results fell, 2020, beside Pennsylvania and the United States
ResultFayette County testsFayette County sharePennsylvania shareU.S. shareAgainst Pennsylvania
Under 2 pCi/L15554.0%44.3%51.6%+9.7 points
2 to 4 pCi/L8228.6%25.4%22.9%+3.2 points
4 pCi/L and above5017.4%30.3%25.5%−12.9 points
Fayette County ranked among the 63 Pennsylvania counties with 30 or more tests, by share at or above 4 pCi/L, 2020
CountyRankTestsAt or above 4 pCi/LMedian
Luzerne County53 of 6399128.2%2.0 pCi/L
Lackawanna County54 of 6377627.1%2.1 pCi/L
Chester County55 of 636,77024.0%2.0 pCi/L
Bucks County56 of 637,06623.2%2.0 pCi/L
Erie County57 of 631,16222.2%1.9 pCi/L
Montgomery County58 of 6310,50821.8%2.0 pCi/L
Greene County59 of 634520.0%3.2 pCi/L
Potter County60 of 6319517.9%1.1 pCi/L
Fayette County61 of 6328717.4%1.8 pCi/L
Delaware County62 of 636,04114.7%1.8 pCi/L
Philadelphia County63 of 638,44210.6%1.7 pCi/L
Fayette County radon tests by year, against Pennsylvania's pooled share
YearTestsAt or above 4 pCi/LMedianHighestPennsylvania, pooledChange from the row before
202028717.4%1.8 pCi/L33.9 pCi/L30.3%−13.6 points
201927731.0%2.3 pCi/L66.5 pCi/L31.4%+2.3 points
201812228.7%2.7 pCi/L40.2 pCi/L30.5%−12.7 points
201718141.4%2.9 pCi/L50.8 pCi/L35.1%+6.6 points
201622134.8%2.5 pCi/L75.2 pCi/L34.4%−0.9 points
201522135.7%2.8 pCi/L88.8 pCi/L37.8%+7.5 points
201420628.2%2.3 pCi/L99.2 pCi/L36.1%First on file

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

Fayette County, State data

Pennsylvania's own radon test data

Measured

What Pennsylvania's own agencies publish about radon tests in Fayette County, with their period. These are not CDC's figures and are never added to them.

MeasuredState figures, not CDC's

What Pennsylvania DEP reports for the ZIP codes in Fayette County

Pennsylvania DEP publishes its figures by ZIP code, not by county. These are the 58 ZIP codes that lie wholly or partly in Fayette County, each with the state's own figures for it. Period: Period not stated by DEP.

ZIP codes in Fayette County
ZIP codeWhat the state reports
15012Basement: average 4.6 pCi/L, 1,117 tests; First floor: average 3.7 pCi/L, 75 tests
15401Basement: average 4.2 pCi/L, 1,033 tests; First floor: average 1.9 pCi/L, 172 tests
15410Basement: figures not shown; First floor: figures not shown
15413Basement: figures not shown
15416Basement: figures not shown
15417Basement: average 5.8 pCi/L, 212 tests; First floor: figures not shown
15420Basement: figures not shown
15421Basement: average 6.1 pCi/L, 36 tests; First floor: figures not shown
15424Basement: average 10.4 pCi/L, 61 tests; First floor: figures not shown
15425Basement: average 4.8 pCi/L, 510 tests; First floor: average 3.0 pCi/L, 69 tests
15428Basement: average 4.3 pCi/L, 33 tests; First floor: figures not shown
15430Basement: figures not shown
15431Basement: average 3.9 pCi/L, 63 tests; First floor: figures not shown
15433Basement: figures not shown
15435Basement: figures not shown; First floor: figures not shown
15436Basement: average 3.8 pCi/L, 52 tests; First floor: figures not shown
15437Basement: average 3.9 pCi/L, 59 tests; First floor: figures not shown
15438Basement: average 4.5 pCi/L, 91 tests; First floor: figures not shown
15440Basement: figures not shown; First floor: figures not shown
15442Basement: figures not shown; First floor: figures not shown
15444Basement: figures not shown
15445Basement: average 7.6 pCi/L, 84 tests; First floor: figures not shown
15446Basement: figures not shown
15449Basement: figures not shown
15450Basement: figures not shown; First floor: figures not shown
15451Basement: figures not shown
15455Basement: figures not shown
15456Basement: average 4.9 pCi/L, 61 tests; First floor: figures not shown
15458Basement: figures not shown
15459Basement: average 10.1 pCi/L, 32 tests; First floor: figures not shown
15461Basement: average 3.2 pCi/L, 66 tests; First floor: figures not shown
15462Basement: figures not shown
15463Basement: figures not shown
15464Basement: figures not shown; First floor: figures not shown
15465First floor: figures not shown
15466Basement: figures not shown
15467Basement: figures not shown
15468Basement: average 5.6 pCi/L, 51 tests; First floor: figures not shown
15469Basement: figures not shown; First floor: figures not shown
15470Basement: figures not shown; First floor: figures not shown
15472Basement: figures not shown
15473Basement: average 6.6 pCi/L, 152 tests; First floor: figures not shown
15474Basement: average 4.0 pCi/L, 46 tests; First floor: figures not shown
15475Basement: figures not shown
15478Basement: average 5.7 pCi/L, 66 tests; First floor: figures not shown
15480Basement: average 10.4 pCi/L, 40 tests; First floor: figures not shown
15482Basement: figures not shown; First floor: figures not shown
15484Basement: figures not shown; First floor: figures not shown
15486Basement: average 4.0 pCi/L, 43 tests; First floor: figures not shown
15488Basement: figures not shown; First floor: figures not shown
15489Basement: figures not shown
15490Basement: figures not shown
15557Basement: average 8.3 pCi/L, 161 tests; First floor: figures not shown
15610Basement: average 7.7 pCi/L, 190 tests; First floor: figures not shown
15622Basement: average 11.6 pCi/L, 191 tests; First floor: average 8.9 pCi/L, 89 tests
15631Basement: average 2.8 pCi/L, 30 tests; First floor: figures not shown
15666Basement: average 4.4 pCi/L, 677 tests; First floor: average 2.1 pCi/L, 149 tests
15683Basement: average 4.2 pCi/L, 384 tests; First floor: average 4.5 pCi/L, 43 tests
  • DEP's report gives the number of tests, the highest result and the average result for each floor tested; it states no period.
  • DEP says the smartest thing to do is to test your home for radon, no matter where you live.
  • A ZIP code that crosses the county line is listed whole; its figures cover all of it.

Measured: Pennsylvania DEP data, Period not stated by DEP.

Fayette County, Geology

The ground under Fayette County

Predicted

USGS's geologic map splits Fayette County: 55.8% of its land is moderate radon potential and 44.2% high. The map puts 51.8% of Fayette County in the area it calls Allegheny Mountain Section and 44.2% in Pennsylvanian Rocks of the Pittsburgh Low Plateau, with one smaller area beside them. USGS gives the first a radon index of 11, in the moderate band (9 to 11), and the second 14, in the high band (12 to 17).

USGS's geologic areas under Fayette County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Allegheny Mountain SectionPennsylvanian sandstone, siltstone, shale, limestone, coal.Moderate1151.8%
Pennsylvanian Rocks of the Pittsburgh Low PlateauPennsylvanian marine shale, siltstone, sandstone, limestone, and coal.High1444.2%
Permian Rocks of the Pittsburgh Low PlateauPermian sandstone, shale, limestone, and coal.Moderate113.8%

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

Fayette County beside the ground around it

Pennsylvania as a whole has more high-potential ground than Fayette County: 70.4% of its land, against 44.2% here. Of the 7 counties that border it, 1 has more high-potential ground, Westmoreland County the most at 65.4%.

Share of land by USGS radon potential: Fayette County, the 7 counties bordering it and Pennsylvania
AreaEPA zoneLow potentialModerate potentialHigh potential
Fayette CountyZone 2None55.8%44.2%
Westmoreland CountyZone 1None34.6%65.4%
Greene CountyZone 2None92.3%7.7%
Monongalia County, WVZone 1None100%None
Somerset CountyZone 2None99.2%0.8%
Preston County, WVZone 1None100%None
Washington CountyZone 2None58.8%41.2%
Garrett County, MDZone 2None100%None
Pennsylvania67 counties, pooled by land areaVaries0.7%28.9%70.4%

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

Local help

Fayette County, Local resources

Radon testing and mitigation in Fayette County

Listed radon businesses with an address in Fayette County:

Listed radon professionals by town: Uniontown, Connellsville

What Pennsylvania's program says
Phone
800-237-2366
Licensing of radon professionals
The Radon Certification Act requires DEP to establish by regulation, a certification program for persons conducting radon gas and radon progeny testing, laboratory analysis and mitigation of radon contamination in buildings.

What it means

Fayette County, Questions

Questions about radon in Fayette County

Are radon levels high in Fayette County?

In 2020, 17.4% of the radon tests reported to CDC for Fayette County, Pennsylvania were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.8 pCi/L. Of 63 Pennsylvania counties with 30 or more tests for the same period, 60 reported a higher share; pooled, the state comes to 30.3%.

Which counties border Fayette County?

Fayette County borders 7 counties: Westmoreland County, PA, Greene County, PA, Monongalia County, WV, Somerset County, PA, Preston County, WV, Washington County, PA and Garrett County, MD.

Products

Fayette County, Products

Testing a home in Fayette County

In Fayette County, 17.4% of 287 tests reported to CDC in 2020 reached 4 pCi/L, against 30.3% pooled across Pennsylvania. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Fayette County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Fayette County homes, compared

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Fayette County, Bordering counties

Counties bordering Fayette County

Calculated by Radon411

Fayette County, Cities and towns

Cities and towns in Fayette County

About 123,021 people live in Fayette County by the Census Bureau's estimate for July 1, 2025, 5,564 fewer than in 2020 (−4.3%). That works out to 156 people per square mile of land. No town dominates: Uniontown, the largest, has 9,434 residents, 7.7% of the total. Reported testing is thin here: 287 tests over 2020, or 2.3 for every 1,000 residents (2025 estimate), where Pennsylvania as a whole comes to 7.2.

From Uniontown to Seven Springs, CDC publishes no figure by town: each reads Fayette County's.

The 12 largest cities and towns in Fayette County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Uniontown9,434−5.5%7.7%
Connellsville6,574−6.1%5.3%
Masontown3,100−4.3%2.5%
Brownsville2,075−4.6%1.7%
South Connellsville1,835−4.3%1.5%
Fairchance1,787−4.1%1.5%
Perryopolis1,599−5.9%1.3%
Point Marion1,094−4.3%0.9%
Belle Vernon979−4.4%0.8%
Dunbar978−4.3%0.8%
Smithfield793−4.2%0.6%
Everson736−4.2%0.6%
  • Newell
  • Fayette City
  • Vanderbilt
  • Dawson
  • Markleysburg
  • Ohiopyle
  • Seven Springs (part)

19 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. “(part)” marks a place that extends into another county. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025).

Fayette County, Homes

Homes in Fayette County

Of Fayette County's 62,060 homes, 74% are detached houses, against 57% across Pennsylvania; 10% are mobile homes. Half of its homes were built before 1958, close to Pennsylvania's 1965: 52% date from before 1960 and 9% from 2000 or later. 72% of occupied homes are lived in by their owner (Pennsylvania: 69%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Fayette County, Pennsylvania, 2019 to 2023
HomesFayette CountyPennsylvania
Housing units62,0605,779,663
Detached houses74%57%
In buildings of 5 or more6%13%
Mobile homes10%4%
Built before 196052%45%
Built since 20009%14%
Middle year built19581965
Owner-occupied72%69%

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