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Radon Levels in Clearfield County, Pennsylvania

EPA puts Clearfield County in Zone 1, its highest radon zone, and high results are common there: 47.5% of the 394 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

    47.5%

    17.2 pts above PA

    Clearfield
    47.5%
    PA
    30.3%

    394 tests, 2020

  • Median result

    3.6pCi/L

    Below action level

    Clearfield
    3.6 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2020

  • Tests reported

    394

    33rd of 63 by tests

    Clearfield
    394
    Montgomery
    10,508

    Reported to CDC before any fix, 2020

  • 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 PA

    10 of 63

    Top quarter

    Clearfield
    47.5%
    Perry
    57.7%

    By share, of 63 with 30+ tests

Read a result for Clearfield County

Starts at Clearfield County's median, 3.6 pCi/L

3.6pCi/L

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

EPA’s reading of 3.6 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. Clearfield County's median reported result, 2020.

Interpret this readingWhat a fix costs

The data

Clearfield County, At a glance

Clearfield County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Clearfield 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 Clearfield County, 2020

Share of reported tests at or above 4 pCi/L, by year, Clearfield County
Share of reported tests at or above 4 pCi/L, by year, Clearfield County
YearShare of reported tests at or above 4 pCi/L
201448.4%
201553.7%
201654.4%
201754.9%
201850.4%
201950.6%
202047.5%

2020: 47.5%. Across these years the share ran from 47.5% to 54.9%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

These are the 394 tests reported to CDC for Clearfield 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

Clearfield County, Compared

Clearfield County radon figures, compared

Calculated by Radon411

In Clearfield County, about 5 in 10 reported tests in 2020 (187 of 394) were at or above EPA's action level. Against the national pool of 25.5%, the gap is 22.0 points higher. Across 67 Pennsylvania counties pooled together, 30.3% of tests reached that level, so Clearfield County runs 17.2 points above its state.

Of 7 neighbours with a figure, 1 reported a larger share at or above 4 pCi/L and 6 a smaller one; the spread is 38.6% (Jefferson County) to 54.1% (Clinton County). By share, Clearfield County is 10th of 63 Pennsylvania counties with 30 or more tests for the same period.

Year by year, 2014 opened at 48.4% and 2020 closed at 47.5% (about level), with 2017 the high at 54.9%. Half the tests came in under 3.6 pCi/L and half over it; the single highest reached 224.6 pCi/L. Below the action level, 115 tests (29.2%) came in under 2 pCi/L, against 44.3% statewide, and 92 tests (23.4%) fell between 2 and 4, against 25.4% statewide.

Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 47.5% share point the same way here. USGS geology rates 84% of the county's land high radon potential.

The busiest year on file was 2016, with 524 tests reported; the quietest, 2018, had 276.

Share of reported tests at or above 4 pCi/L by year, Clearfield County against Pennsylvania2014 to 2020, years with 30 or more tests: Clearfield County 48.4% to 47.5%, the state's pooled share 30.3% in 2020.
Clearfield CountyPennsylvania, pooled
Share of reported tests at or above 4 pCi/L by year, Clearfield County against Pennsylvania: data table
YearTestsClearfield County, at or above 4 pCi/LPennsylvania, pooled
201444048.4%36.1%
201540453.7%37.8%
201652454.4%34.4%
201746854.9%35.1%
201827650.4%30.5%
201948850.6%31.4%
202039447.5%30.3%
Clearfield County against Pennsylvania, the United States and nearby counties, 2020
AreaTestsAt or above 4 pCi/LMedianDifference from Clearfield County
Clearfield County39447.5%3.6 pCi/LThis county
Pennsylvania, pooled67 counties, pooled93,66930.3%Not pooled−17.2 points
United States, pooled915 counties, pooled405,35525.5%Not pooled−22.0 points
Perry Countyhighest in the state18957.7%4.9 pCi/L+10.2 points
Philadelphia Countylowest in the state8,44210.6%1.7 pCi/L−36.9 points
Cameron County, PAborders it475.0%4.8 pCi/L+27.5 points
Clinton County, PAborders it13354.1%4.5 pCi/L+6.6 points
Elk County, PAborders it6647.0%3.5 pCi/L−0.5 points
Cambria County, PAborders it32944.7%3.3 pCi/L−2.8 points
Indiana County, PAborders it22844.3%3.6 pCi/L−3.2 points
Blair County, PAborders it42442.0%3.2 pCi/L−5.5 points
Centre County, PAborders it67039.3%2.3 pCi/L−8.2 points
Jefferson County, PAborders it25438.6%2.6 pCi/L−8.9 points
Where Clearfield County's reported results fell, 2020, beside Pennsylvania and the United States
ResultClearfield County testsClearfield County sharePennsylvania shareU.S. shareAgainst Pennsylvania
Under 2 pCi/L11529.2%44.3%51.6%−15.1 points
2 to 4 pCi/L9223.4%25.4%22.9%−2.0 points
4 pCi/L and above18747.5%30.3%25.5%+17.2 points
Clearfield 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
Schuylkill County5 of 6379753.5%4.5 pCi/L
Juniata County6 of 638752.9%4.4 pCi/L
Northumberland County7 of 6327549.8%3.9 pCi/L
Bedford County8 of 636947.8%3.8 pCi/L
Armstrong County9 of 6318747.6%3.7 pCi/L
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
Clearfield County radon tests by year, against Pennsylvania's pooled share
YearTestsAt or above 4 pCi/LMedianHighestPennsylvania, pooledChange from the row before
202039447.5%3.6 pCi/L224.6 pCi/L30.3%−3.1 points
201948850.6%4.0 pCi/L141.8 pCi/L31.4%+0.2 points
201827650.4%4.0 pCi/L134.1 pCi/L30.5%−4.5 points
201746854.9%4.5 pCi/L104.0 pCi/L35.1%+0.5 points
201652454.4%4.6 pCi/L216.6 pCi/L34.4%+0.7 points
201540453.7%4.3 pCi/L318.0 pCi/L37.8%+5.3 points
201444048.4%3.6 pCi/L131.3 pCi/L36.1%First on file

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

Clearfield County, State data

Pennsylvania's own radon test data

Measured

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

Pennsylvania DEP publishes its figures by ZIP code, not by county. These are the 51 ZIP codes that lie wholly or partly in Clearfield County, each with the state's own figures for it. Period: Period not stated by DEP.

ZIP codes in Clearfield County
ZIP codeWhat the state reports
15721Basement: figures not shown; First floor: figures not shown
15724Basement: average 12.9 pCi/L, 72 tests; First floor: figures not shown
15742Basement: average 19.3 pCi/L, 52 tests; First floor: figures not shown
15753Basement: figures not shown; First floor: figures not shown
15757Basement: average 10.5 pCi/L, 34 tests; First floor: figures not shown
15767Basement: average 13.4 pCi/L, 843 tests; First floor: average 7.6 pCi/L, 111 tests
15801Basement: average 10.9 pCi/L, 4,275 tests; First floor: average 5.6 pCi/L, 270 tests
15824Basement: average 8.4 pCi/L, 318 tests; First floor: average 4.3 pCi/L, 31 tests
15840Basement: average 8.1 pCi/L, 122 tests; First floor: figures not shown
15848Basement: figures not shown; First floor: figures not shown
15849Basement: average 5.1 pCi/L, 30 tests; First floor: figures not shown
15856Basement: average 9.7 pCi/L, 48 tests; First floor: figures not shown
15865Basement: average 9.0 pCi/L, 67 tests; First floor: figures not shown
15866Basement: figures not shown; First floor: figures not shown
16616Basement: figures not shown; First floor: figures not shown
16620Basement: figures not shown
16627Basement: average 9.8 pCi/L, 38 tests; First floor: figures not shown
16639Basement: figures not shown; First floor: figures not shown
16645Basement: figures not shown; First floor: figures not shown
16646Basement: average 13.3 pCi/L, 90 tests; First floor: figures not shown
16651Basement: average 9.2 pCi/L, 152 tests; First floor: figures not shown
16656Basement: figures not shown; First floor: figures not shown
16661Basement: figures not shown; First floor: figures not shown
16666Basement: average 7.1 pCi/L, 106 tests; First floor: figures not shown
16671Basement: figures not shown; First floor: figures not shown
16680Basement: figures not shown
16692Basement: figures not shown; First floor: figures not shown
16821Basement: figures not shown
16825Basement: figures not shown; First floor: figures not shown
16830Basement: average 7.0 pCi/L, 802 tests; First floor: average 6.3 pCi/L, 97 tests
16833Basement: average 12.2 pCi/L, 166 tests; First floor: average 6.8 pCi/L, 44 tests
16834Basement: figures not shown; First floor: figures not shown
16836Basement: figures not shown; First floor: figures not shown
16837Basement: figures not shown
16838Basement: average 11.6 pCi/L, 82 tests; First floor: figures not shown
16839Basement: figures not shown
16840Basement: figures not shown; First floor: figures not shown
16843Basement: figures not shown
16845Basement: figures not shown; First floor: figures not shown
16847Basement: figures not shown; First floor: figures not shown
16849Basement: figures not shown; First floor: figures not shown
16855Basement: figures not shown; First floor: figures not shown
16858Basement: average 9.7 pCi/L, 146 tests; First floor: figures not shown
16860Basement: figures not shown; First floor: figures not shown
16861Basement: figures not shown
16863Basement: figures not shown; First floor: figures not shown
16866Basement: average 9.9 pCi/L, 642 tests; First floor: average 2.6 pCi/L, 109 tests
16876Basement: figures not shown; First floor: figures not shown
16878Basement: average 10.5 pCi/L, 61 tests; First floor: figures not shown
16879Basement: figures not shown; First floor: figures not shown
16881Basement: average 10.8 pCi/L, 51 tests; First floor: figures not shown
  • 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.

Clearfield County, Geology

The ground under Clearfield County

Predicted

Most of the ground under Clearfield County is one class on USGS's geologic map: 83.5% of its land is high radon potential, with 16.5% moderate. The map puts 53.5% of Clearfield County in the area it calls Pennsylvanian Rocks of the Pittsburgh Low Plateau and 30.1% in Mountainous High Plateau, with one smaller area beside them. USGS gives the first a radon index of 14 and the second 12, both in the high band (12 to 17).

USGS's geologic areas under Clearfield County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Pennsylvanian Rocks of the Pittsburgh Low PlateauPennsylvanian marine shale, siltstone, sandstone, limestone, and coal.High1453.5%
Mountainous High PlateauSandstone, shale and conglomerate.High1230.1%
Allegheny Mountain SectionPennsylvanian sandstone, siltstone, shale, limestone, coal.Moderate1116.4%

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

Clearfield County beside the ground around it

Clearfield County has more high-potential ground than Pennsylvania as a whole: 83.5% of its land against 70.4%. Of the 8 counties that border it, 2 have more high-potential ground, Clinton County the most at 99.2%.

Share of land by USGS radon potential: Clearfield County, the 8 counties bordering it and Pennsylvania
AreaEPA zoneLow potentialModerate potentialHigh potential
Clearfield CountyZone 1None16.5%83.5%
Jefferson CountyZone 2None63.7%36.3%
Blair CountyZone 1None8.2%91.8%
Centre CountyZone 1None17.6%82.4%
Cameron CountyZone 1None20.1%79.9%
Elk CountyZone 2None66.7%33.3%
Cambria CountyZone 2None97.6%2.4%
Indiana CountyZone 1None23.2%76.8%
Clinton CountyZone 1None0.8%99.2%
Pennsylvania67 counties, pooled by land areaVaries0.7%28.9%70.4%

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

Local help

Clearfield County, Local resources

Radon testing and mitigation in Clearfield 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

Clearfield County, Questions

Questions about radon in Clearfield County

Are radon levels high in Clearfield County?

In 2020, 47.5% of the radon tests reported to CDC for Clearfield County, Pennsylvania were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.6 pCi/L. Of 63 Pennsylvania counties with 30 or more tests for the same period, 9 reported a higher share; pooled, the state comes to 30.3%.

Which counties border Clearfield County?

Clearfield County borders 8 counties: Jefferson County, Blair County, Centre County, Cameron County, Elk County, Cambria County, Indiana County and Clinton County.

Products

Clearfield County, Products

Testing a home in Clearfield County

In Clearfield County, 47.5% of 394 tests reported to CDC in 2020 reached 4 pCi/L, against 30.3% pooled across Pennsylvania. In Zone 1 the year-round level in Clearfield 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

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

Explore

Clearfield County, Bordering counties

Counties bordering Clearfield County

Calculated by Radon411

Clearfield County, Cities and towns

Cities and towns in Clearfield County

About 78,100 people live in Clearfield County by the Census Bureau's estimate for July 1, 2025, 2,327 fewer than in 2020 (−2.9%). That works out to 68 people per square mile of land. No town dominates: DuBois, the largest, has 7,254 residents, 9.3% of the total. CDC's 394 reported tests for 2020 work out to 5.0 per 1,000 residents (2025 estimate), close to Pennsylvania's 7.2.

From DuBois to New Washington, CDC publishes no figure by town: each reads Clearfield County's.

The 12 largest cities and towns in Clearfield County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
DuBois7,254−3.2%9.3%
Clearfield5,753−3.3%7.4%
Curwensville2,473−3.3%3.2%
Osceola Mills1,007−3.4%1.3%
Falls Creekextends beyond Clearfield County1,002−2.8%Counted whole
Chester Hill787−3.4%1.0%
Houtzdale741−3.1%0.9%
Irvona528−3.1%0.7%
Ramey421−2.8%0.5%
Coalport414−3.5%0.5%
Brisbin412−2.6%0.5%
Grampian345−3.1%0.4%
  • Westover
  • Wallaceton
  • Mahaffey
  • Troutville
  • Burnside
  • Glen Hope
  • Newburg
  • New Washington

20 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). A place that extends beyond Clearfield County is counted whole, so it has no share.

Clearfield County, Homes

Homes in Clearfield County

Clearfield County is a place of houses on their own lots: 76% of its 38,160 homes are detached single-family houses, against 57% across Pennsylvania. Half of its homes were built before 1969, close to Pennsylvania's 1965: 44% date from before 1960 and 12% from 2000 or later. Owners live in 78% of the occupied homes (Pennsylvania: 69%), so for most households a test and a fix are their own to order.

Homes in Clearfield County, Pennsylvania, 2019 to 2023
HomesClearfield CountyPennsylvania
Housing units38,1605,779,663
Detached houses76%57%
In buildings of 5 or more6%13%
Mobile homes11%4%
Built before 196044%45%
Built since 200012%14%
Middle year built19691965
Owner-occupied78%69%

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