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Radon Levels in Cambria County, Pennsylvania

EPA puts Cambria County in Zone 2, its middle radon zone, and high results are common there: 44.7% of the 329 radon tests reported to CDC (2020) 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

How to test this homeFind a certified tester

  • Share at 4+ pCi/L

    44.7%

    14.4 pts above PA

    Cambria
    44.7%
    PA
    30.3%

    329 tests, 2020

  • Median result

    3.3pCi/L

    Below action level

    Cambria
    3.3 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2020

  • Tests reported

    329

    34th of 63 by tests

    Cambria
    329
    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

    15 of 63

    Top quarter

    Cambria
    44.7%
    Perry
    57.7%

    By share, of 63 with 30+ tests

Read a result for Cambria County

Starts at Cambria County's median, 3.3 pCi/L

3.3pCi/L

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

EPA’s reading of 3.3 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. Cambria County's median reported result, 2020.

Interpret this readingWhat a fix costs

The data

Cambria County, At a glance

Cambria County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Cambria 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 98% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Cambria County, 2020

Share of reported tests at or above 4 pCi/L, by year, Cambria County
Share of reported tests at or above 4 pCi/L, by year, Cambria County
YearShare of reported tests at or above 4 pCi/L
201442.5%
201541.0%
201635.8%
201738.3%
201836.8%
201944.3%
202044.7%

2020: 44.7%. Across these years the share ran from 35.8% to 44.7%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

These are the 329 tests reported to CDC for Cambria 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

Cambria County, Compared

Cambria County radon figures, compared

Calculated by Radon411

In Cambria County, about 4 in 10 reported tests in 2020 (147 of 329) were at or above EPA's action level. Against the national pool of 25.5%, the gap is 19.2 points higher. Across 67 Pennsylvania counties pooled together, 30.3% of tests reached that level, so Cambria County runs 14.4 points above its state.

Of 6 neighbours with a figure, 2 reported a larger share at or above 4 pCi/L and 4 a smaller one; the spread is 34.9% (Westmoreland County) to 47.8% (Bedford County). By share, Cambria County is 15th of 63 Pennsylvania counties with 30 or more tests for the same period.

Year by year, 2014 opened at 42.5% and 2020 closed at 44.7% (up 2.2 points), with 2020 the high at 44.7%. Half the tests came in under 3.3 pCi/L and half over it; the single highest reached 166.3 pCi/L. Below the action level, 105 tests (31.9%) came in under 2 pCi/L, against 44.3% statewide, and 77 tests (23.4%) fell between 2 and 4, against 25.4% statewide.

Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 44.7% share point the same way here. USGS geology rates 98% of the county's land moderate radon potential.

The busiest year on file was 2019, with 422 tests reported; the quietest, 2018, had 266.

Share of reported tests at or above 4 pCi/L by year, Cambria County against Pennsylvania2014 to 2020, years with 30 or more tests: Cambria County 42.5% to 44.7%, the state's pooled share 30.3% in 2020.
Cambria CountyPennsylvania, pooled
Share of reported tests at or above 4 pCi/L by year, Cambria County against Pennsylvania: data table
YearTestsCambria County, at or above 4 pCi/LPennsylvania, pooled
201440942.5%36.1%
201536141.0%37.8%
201639435.8%34.4%
201734538.3%35.1%
201826636.8%30.5%
201942244.3%31.4%
202032944.7%30.3%
Cambria County against Pennsylvania, the United States and nearby counties, 2020
AreaTestsAt or above 4 pCi/LMedianDifference from Cambria County
Cambria County32944.7%3.3 pCi/LThis county
Pennsylvania, pooled67 counties, pooled93,66930.3%Not pooled−14.4 points
United States, pooled915 counties, pooled405,35525.5%Not pooled−19.2 points
Perry Countyhighest in the state18957.7%4.9 pCi/L+13.0 points
Philadelphia Countylowest in the state8,44210.6%1.7 pCi/L−34.1 points
Bedford County, PAborders it6947.8%3.8 pCi/L+3.1 points
Clearfield County, PAborders it39447.5%3.6 pCi/L+2.8 points
Indiana County, PAborders it22844.3%3.6 pCi/L−0.4 points
Somerset County, PAborders it12643.7%3.7 pCi/L−1.0 points
Blair County, PAborders it42442.0%3.2 pCi/L−2.7 points
Westmoreland County, PAborders it1,58834.9%2.6 pCi/L−9.8 points
Where Cambria County's reported results fell, 2020, beside Pennsylvania and the United States
ResultCambria County testsCambria County sharePennsylvania shareU.S. shareAgainst Pennsylvania
Under 2 pCi/L10531.9%44.3%51.6%−12.4 points
2 to 4 pCi/L7723.4%25.4%22.9%−2.0 points
4 pCi/L and above14744.7%30.3%25.5%+14.4 points
Cambria 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
Clearfield County10 of 6339447.5%3.6 pCi/L
Elk County11 of 636647.0%3.5 pCi/L
York County12 of 633,67946.8%3.6 pCi/L
Lycoming County13 of 6356245.2%3.5 pCi/L
Tioga County14 of 6316045.0%3.2 pCi/L
Cambria County15 of 6332944.7%3.3 pCi/L
Union County16 of 6318244.5%3.3 pCi/L
Indiana County17 of 6322844.3%3.6 pCi/L
Somerset County18 of 6312643.7%3.7 pCi/L
Cumberland County19 of 632,95043.6%3.1 pCi/L
Bradford County20 of 6328643.4%3.4 pCi/L
Cambria County radon tests by year, against Pennsylvania's pooled share
YearTestsAt or above 4 pCi/LMedianHighestPennsylvania, pooledChange from the row before
202032944.7%3.3 pCi/L166.3 pCi/L30.3%+0.4 points
201942244.3%3.3 pCi/L144.8 pCi/L31.4%+7.5 points
201826636.8%2.3 pCi/L179.6 pCi/L30.5%−1.5 points
201734538.3%2.7 pCi/L138.0 pCi/L35.1%+2.5 points
201639435.8%2.4 pCi/L62.5 pCi/L34.4%−5.2 points
201536141.0%3.0 pCi/L110.6 pCi/L37.8%−1.5 points
201440942.5%3.2 pCi/L85.7 pCi/L36.1%First on file

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

Cambria County, State data

Pennsylvania's own radon test data

Measured

What Pennsylvania's own agencies publish about radon tests in Cambria 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 Cambria County

Pennsylvania DEP publishes its figures by ZIP code, not by county. These are the 49 ZIP codes that lie wholly or partly in Cambria County, each with the state's own figures for it. Period: Period not stated by DEP.

ZIP codes in Cambria County
ZIP codeWhat the state reports
15714Basement: average 6.2 pCi/L, 237 tests; First floor: figures not shown
15722Basement: average 14.5 pCi/L, 126 tests; First floor: figures not shown
15724Basement: average 12.9 pCi/L, 72 tests; First floor: figures not shown
15737Basement: figures not shown
15738Basement: figures not shown
15760Basement: figures not shown
15762Basement: average 9.4 pCi/L, 80 tests; First floor: figures not shown
15773Basement: figures not shown; First floor: figures not shown
15775Basement: figures not shown
15901Basement: average 4.1 pCi/L, 92 tests; First floor: figures not shown
15902Basement: average 4.7 pCi/L, 532 tests; First floor: figures not shown
15904Basement: average 5.9 pCi/L, 2,235 tests; First floor: average 4.6 pCi/L, 107 tests
15905Basement: average 6.2 pCi/L, 3,225 tests; First floor: average 3.5 pCi/L, 241 tests
15906Basement: average 4.8 pCi/L, 422 tests; First floor: figures not shown
15909Basement: average 7.5 pCi/L, 255 tests; First floor: figures not shown
15921Basement: figures not shown; First floor: figures not shown
15922Basement: figures not shown
15927Basement: figures not shown
15930Basement: figures not shown; First floor: figures not shown
15931Basement: average 8.4 pCi/L, 677 tests; First floor: average 2.5 pCi/L, 39 tests
15934Basement: figures not shown; First floor: figures not shown
15938Basement: average 7.0 pCi/L, 141 tests; First floor: figures not shown
15940Basement: average 7.0 pCi/L, 275 tests; First floor: figures not shown
15942Basement: average 8.1 pCi/L, 119 tests; First floor: figures not shown
15943Basement: average 5.5 pCi/L, 119 tests; First floor: figures not shown
15945Basement: figures not shown; First floor: figures not shown
15946Basement: average 6.9 pCi/L, 226 tests; First floor: average 2.0 pCi/L, 53 tests
15948Basement: figures not shown; First floor: figures not shown
15951Basement: figures not shown
15952Basement: average 8.1 pCi/L, 56 tests; First floor: figures not shown
15955Basement: average 6.6 pCi/L, 74 tests; First floor: figures not shown
15956Basement: average 10.2 pCi/L, 90 tests; First floor: figures not shown
15957Basement: figures not shown; First floor: figures not shown
15958Basement: average 7.8 pCi/L, 84 tests; First floor: figures not shown
15960Basement: figures not shown
15961Basement: average 5.3 pCi/L, 32 tests; First floor: figures not shown
15962Basement: figures not shown
15963Basement: average 7.8 pCi/L, 720 tests; First floor: figures not shown
16613Basement: average 11.4 pCi/L, 83 tests; First floor: figures not shown
16619Basement: figures not shown; First floor: figures not shown
16624Basement: figures not shown; First floor: figures not shown
16627Basement: average 9.8 pCi/L, 38 tests; First floor: figures not shown
16630Basement: average 7.7 pCi/L, 289 tests; First floor: figures not shown
16636Basement: average 15.9 pCi/L, 45 tests; First floor: figures not shown
16639Basement: figures not shown; First floor: figures not shown
16640Basement: average 12.7 pCi/L, 80 tests; First floor: figures not shown
16641Basement: average 6.9 pCi/L, 104 tests; First floor: figures not shown
16646Basement: average 13.3 pCi/L, 90 tests; First floor: figures not shown
16668Basement: average 11.5 pCi/L, 246 tests; First floor: average 9.2 pCi/L, 32 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.

Cambria County, Geology

The ground under Cambria County

Predicted

Most of the ground under Cambria County is one class on USGS's geologic map: 97.6% of its land is moderate radon potential, with 2.4% high. 97.6% of it lies in the area the map calls Allegheny Mountain Section, to which USGS gives a radon index of 11, in the moderate band (9 to 11).

USGS's geologic areas under Cambria County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Allegheny Mountain SectionPennsylvanian sandstone, siltstone, shale, limestone, coal.Moderate1197.6%
Pennsylvanian Rocks of the Pittsburgh Low PlateauPennsylvanian marine shale, siltstone, sandstone, limestone, and coal.High141.4%
Appalachian Mountain SectionPaleozoic sandstone, shale, and limestone.High120.9%

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

Cambria County beside the ground around it

Pennsylvania as a whole has more high-potential ground than Cambria County: 70.4% of its land, against 2.4% here. Of the 6 counties that border it, 5 have more high-potential ground, Bedford County the most at 97.7%.

Share of land by USGS radon potential: Cambria County, the 6 counties bordering it and Pennsylvania
AreaEPA zoneLow potentialModerate potentialHigh potential
Cambria CountyZone 2None97.6%2.4%
Blair CountyZone 1None8.2%91.8%
Indiana CountyZone 1None23.2%76.8%
Bedford CountyZone 1None2.3%97.7%
Westmoreland CountyZone 1None34.6%65.4%
Clearfield CountyZone 1None16.5%83.5%
Somerset CountyZone 2None99.2%0.8%
Pennsylvania67 counties, pooled by land areaVaries0.7%28.9%70.4%

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

Local help

Cambria County, Local resources

Radon testing and mitigation in Cambria County

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

Cambria County, Questions

Questions about radon in Cambria County

Are radon levels high in Cambria County?

In 2020, 44.7% of the radon tests reported to CDC for Cambria County, Pennsylvania were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.3 pCi/L. Of 63 Pennsylvania counties with 30 or more tests for the same period, 14 reported a higher share; pooled, the state comes to 30.3%.

Which counties border Cambria County?

Cambria County borders 6 counties: Blair County, Indiana County, Bedford County, Westmoreland County, Clearfield County and Somerset County.

Products

Cambria County, Products

Testing a home in Cambria County

In Cambria County, 44.7% of 329 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 Cambria County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Cambria County homes, compared

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Cambria County, Bordering counties

Counties bordering Cambria County

Calculated by Radon411

Cambria County, Cities and towns

Cities and towns in Cambria County

About 128,968 people live in Cambria County by the Census Bureau's estimate for July 1, 2025, 4,232 fewer than in 2020 (−3.2%). That works out to 188 people per square mile of land. No town dominates: Johnstown, the largest, has 17,654 residents, 13.7% of the total. Reported testing is thin here: 329 tests over 2020, or 2.6 for every 1,000 residents (2025 estimate), where Pennsylvania as a whole comes to 7.2.

From Johnstown to Chest Springs, CDC publishes no figure by town: each reads Cambria County's.

The 12 largest cities and towns in Cambria County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Johnstown17,654−3.9%13.7%
Westmont4,747−3.7%3.7%
Northern Cambria3,399−3.8%2.6%
Ebensburg3,228−3.7%2.5%
Nanty-Glo2,413−3.7%1.9%
Portage2,344−3.9%1.8%
Geistown2,263−3.8%1.8%
Southmont1,957−4.0%1.5%
Patton1,656−3.8%1.3%
Ferndale1,485−4.0%1.2%
Cresson1,465−3.7%1.1%
Gallitzin1,465−3.9%1.1%
  • Hastings
  • Loretto
  • East Conemaugh
  • Carrolltown
  • Dale
  • South Fork
  • Lilly
  • Scalp Level
  • Brownstown
  • Sankertown
  • Lorain
  • Summerhill
  • Vintondale
  • Tunnelhill (part)
  • Daisytown
  • Franklin
  • Ashville
  • Wilmore
  • Ehrenfeld
  • Cassandra
  • Chest Springs

33 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).

Cambria County, Homes

Homes in Cambria County

Of Cambria County's 64,494 homes, 74% are detached houses, against 57% across Pennsylvania; 9% are in buildings of five or more homes. The homes are older than Pennsylvania's as a whole: half were built before 1956 (1965 for Pennsylvania), and 57% date from before 1960. Owners live in 76% of the occupied homes (Pennsylvania: 69%), so for most households a test and a fix are their own to order.

Homes in Cambria County, Pennsylvania, 2019 to 2023
HomesCambria CountyPennsylvania
Housing units64,4945,779,663
Detached houses74%57%
In buildings of 5 or more9%13%
Mobile homes4%4%
Built before 196057%45%
Built since 20007%14%
Middle year built19561965
Owner-occupied76%69%

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