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Radon Levels in Bucks County, Pennsylvania

EPA puts Bucks County in Zone 1, its highest radon zone, and 23.2% of its 7,066 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

    23.2%

    7.1 pts below PA

    Bucks
    23.2%
    PA
    30.3%

    7,066 tests, 2020

  • Median result

    2.0pCi/L

    Below action level

    Bucks
    2.0 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2020

  • Tests reported

    7,066

    4th of 63 by tests

    Bucks
    7,066
    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

    56 of 63

    Lowest quarter

    Bucks
    23.2%
    Perry
    57.7%

    By share, of 63 with 30+ tests

Read a result for Bucks County

Starts at Bucks County's median, 2.0 pCi/L

2.0pCi/L

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

EPA’s reading of 2.0 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. Bucks County's median reported result, 2020.

Interpret this readingWhat a fix costs

The data

Bucks County, At a glance

Bucks County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Bucks 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 89% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Bucks County, 2020

Share of reported tests at or above 4 pCi/L, by year, Bucks County
Share of reported tests at or above 4 pCi/L, by year, Bucks County
YearShare of reported tests at or above 4 pCi/L
201424.9%
201527.8%
201626.7%
201727.2%
201822.1%
201922.7%
202023.2%

2020: 23.2%. Across these years the share ran from 22.1% to 27.8%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

These are the 7,066 tests reported to CDC for Bucks 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

Bucks County, Compared

Bucks County radon figures, compared

Calculated by Radon411

Bucks County's 7,066 reported tests in 2020 had a middle value of 2.0 pCi/L and a maximum of 215.0 pCi/L, and 23.2% reached 4 pCi/L. Pennsylvania as a whole (67 Pennsylvania counties, pooled) comes to 30.3%: 7.1 points higher than here.

Among its state's counties it ranks 56th 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, 3,474 tests (49.2%) came in under 2 pCi/L, against 44.3% statewide, and 1,952 tests (27.6%) fell between 2 and 4, against 25.4% statewide. The busiest year on file was 2016, with 9,322 tests reported; the quietest, 2014, had 6,687.

EPA's 1993 zone map puts Bucks County in Zone 1, a predicted county average above 4 pCi/L. USGS geology rates 89% of the county's land high radon potential.

Next door, the shares run from 7.0% in Burlington County, NJ to 41.3% in Northampton County, with Montgomery County, Mercer County, NJ and Philadelphia County below Bucks County. Over 7 years of annual figures the share held within 2 points, from 24.9% in 2014 to 23.2% in 2020; its peak was 27.8% in 2015.

Share of reported tests at or above 4 pCi/L by year, Bucks County against Pennsylvania2014 to 2020, years with 30 or more tests: Bucks County 24.9% to 23.2%, the state's pooled share 30.3% in 2020.
Bucks CountyPennsylvania, pooled
Share of reported tests at or above 4 pCi/L by year, Bucks County against Pennsylvania: data table
YearTestsBucks County, at or above 4 pCi/LPennsylvania, pooled
20146,68724.9%36.1%
20157,41927.8%37.8%
20169,32226.7%34.4%
20176,84427.2%35.1%
20186,96722.1%30.5%
20197,36622.7%31.4%
20207,06623.2%30.3%
Bucks County against Pennsylvania, the United States and nearby counties, 2020
AreaTestsAt or above 4 pCi/LMedianDifference from Bucks County
Bucks County7,06623.2%2.0 pCi/LThis county
Pennsylvania, pooled67 counties, pooled93,66930.3%Not pooled+7.1 points
United States, pooled915 counties, pooled405,35525.5%Not pooled+2.3 points
Perry Countyhighest in the state18957.7%4.9 pCi/L+34.5 points
Delaware Countylowest in the state6,04114.7%1.8 pCi/L−8.5 points
Northampton County, PAborders it3,43441.3%2.9 pCi/L+18.1 points
Lehigh County, PAborders it3,10339.8%2.7 pCi/L+16.6 points
Warren County, NJborders it3,47328.1%1.9 pCi/L+4.9 points
Hunterdon County, NJborders it4,68325.7%1.8 pCi/L+2.5 points
Montgomery County, PAborders it10,50821.8%2.0 pCi/L−1.4 points
Mercer County, NJborders it6,04613.6%1.3 pCi/L−9.6 points
Philadelphia County, PAborders it8,44210.6%1.7 pCi/L−12.6 points
Burlington County, NJborders it6,7857.0%0.9 pCi/L−16.2 points
Where Bucks County's reported results fell, 2020, beside Pennsylvania and the United States
ResultBucks County testsBucks County sharePennsylvania shareU.S. shareAgainst Pennsylvania
Under 2 pCi/L3,47449.2%44.3%51.6%+4.9 points
2 to 4 pCi/L1,95227.6%25.4%22.9%+2.2 points
4 pCi/L and above1,64023.2%30.3%25.5%−7.1 points
Bucks 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
Crawford County51 of 6322129.9%2.6 pCi/L
Sullivan County52 of 633129.0%2.0 pCi/L
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
Bucks County radon tests by year, against Pennsylvania's pooled share
YearTestsAt or above 4 pCi/LMedianHighestPennsylvania, pooledChange from the row before
20207,06623.2%2.0 pCi/L215.0 pCi/L30.3%+0.5 points
20197,36622.7%2.0 pCi/L261.6 pCi/L31.4%+0.6 points
20186,96722.1%1.9 pCi/L2107.3 pCi/L30.5%−5.1 points
20176,84427.2%2.3 pCi/L277.9 pCi/L35.1%+0.5 points
20169,32226.7%2.2 pCi/L427.8 pCi/L34.4%−1.1 points
20157,41927.8%2.2 pCi/L162.5 pCi/L37.8%+2.9 points
20146,68724.9%2.0 pCi/L167.5 pCi/L36.1%First on file

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

Bucks County, State data

Pennsylvania's own radon test data

Measured

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

Pennsylvania DEP publishes its figures by ZIP code, not by county. These are the 60 ZIP codes that lie wholly or partly in Bucks County, each with the state's own figures for it. Period: Period not stated by DEP.

ZIP codes in Bucks County
ZIP codeWhat the state reports
18036Basement: average 20.1 pCi/L, 4,175 tests; First floor: average 17.6 pCi/L, 519 tests
18041Basement: average 4.8 pCi/L, 647 tests; First floor: average 2.7 pCi/L, 126 tests
18042Basement: average 8.5 pCi/L, 6,430 tests; First floor: average 4.3 pCi/L, 932 tests
18054Basement: average 4.7 pCi/L, 635 tests; First floor: average 2.7 pCi/L, 111 tests
18055Basement: average 7.9 pCi/L, 2,480 tests; First floor: average 4.0 pCi/L, 323 tests
18073Basement: average 4.5 pCi/L, 1,575 tests; First floor: average 2.2 pCi/L, 202 tests
18077Basement: average 8.6 pCi/L, 729 tests; First floor: average 4.0 pCi/L, 135 tests
18081Basement: average 7.3 pCi/L, 117 tests; First floor: figures not shown
18901Basement: average 5.4 pCi/L, 16,303 tests; First floor: average 3.4 pCi/L, 3,947 tests
18902Basement: average 4.5 pCi/L, 3,680 tests; First floor: average 3.0 pCi/L, 119 tests
18912Basement: average 6.3 pCi/L, 675 tests; First floor: average 3.2 pCi/L, 220 tests
18913Basement: average 14.4 pCi/L, 141 tests; First floor: average 9.3 pCi/L, 50 tests
18914Basement: average 5.3 pCi/L, 6,254 tests; First floor: average 2.9 pCi/L, 1,201 tests
18917Basement: average 4.0 pCi/L, 321 tests; First floor: average 2.3 pCi/L, 85 tests
18920Basement: average 7.0 pCi/L, 206 tests; First floor: average 3.3 pCi/L, 46 tests
18921Basement: average 3.9 pCi/L, 32 tests; First floor: figures not shown
18923Basement: average 4.3 pCi/L, 307 tests; First floor: figures not shown
18925Basement: average 5.6 pCi/L, 2,281 tests; First floor: average 3.4 pCi/L, 339 tests
18927Basement: average 5.1 pCi/L, 168 tests; First floor: average 2.5 pCi/L, 43 tests
18929Basement: average 4.1 pCi/L, 2,820 tests; First floor: average 2.1 pCi/L, 793 tests
18930Basement: average 6.5 pCi/L, 413 tests; First floor: average 3.2 pCi/L, 78 tests
18932Basement: average 5.2 pCi/L, 85 tests; First floor: figures not shown
18933Basement: average 8.5 pCi/L, 117 tests; First floor: average 5.0 pCi/L, 41 tests
18935Basement: figures not shown; First floor: figures not shown
18938Basement: average 6.1 pCi/L, 6,294 tests; First floor: average 3.2 pCi/L, 1,446 tests
18940Basement: average 4.6 pCi/L, 12,315 tests; First floor: average 2.2 pCi/L, 4,326 tests
18942Basement: average 5.5 pCi/L, 573 tests; First floor: average 3.0 pCi/L, 114 tests
18944Basement: average 4.6 pCi/L, 5,165 tests; First floor: average 2.7 pCi/L, 994 tests
18946Basement: average 3.8 pCi/L, 33 tests; First floor: figures not shown
18947Basement: average 5.1 pCi/L, 1,779 tests; First floor: average 2.5 pCi/L, 390 tests
18950Basement: average 8.5 pCi/L, 107 tests; First floor: average 4.4 pCi/L, 72 tests
18951Basement: average 4.6 pCi/L, 5,103 tests; First floor: average 2.1 pCi/L, 1,063 tests
18954Basement: average 7.7 pCi/L, 3,692 tests; First floor: average 4.9 pCi/L, 882 tests
18955Basement: average 4.1 pCi/L, 202 tests; First floor: average 2.9 pCi/L, 38 tests
18960Basement: average 4.2 pCi/L, 2,061 tests; First floor: average 2.1 pCi/L, 400 tests
18962Basement: average 3.9 pCi/L, 59 tests; First floor: figures not shown
18964Basement: average 3.7 pCi/L, 2,395 tests; First floor: average 1.8 pCi/L, 453 tests
18966Basement: average 5.0 pCi/L, 9,416 tests; First floor: average 2.9 pCi/L, 3,023 tests
18969Basement: average 3.8 pCi/L, 2,572 tests; First floor: average 2.1 pCi/L, 543 tests
18970Basement: average 3.1 pCi/L, 63 tests; First floor: figures not shown
18972Basement: average 6.4 pCi/L, 531 tests; First floor: average 2.5 pCi/L, 147 tests
18974Basement: average 5.1 pCi/L, 6,102 tests; First floor: average 2.8 pCi/L, 1,770 tests
18976Basement: average 4.3 pCi/L, 4,489 tests; First floor: average 2.6 pCi/L, 884 tests
18977Basement: average 6.5 pCi/L, 3,060 tests; First floor: average 4.6 pCi/L, 691 tests
18980Basement: average 5.1 pCi/L, 101 tests; First floor: average 2.6 pCi/L, 43 tests
19006Basement: average 4.4 pCi/L, 5,146 tests; First floor: average 2.5 pCi/L, 1,211 tests
19007Basement: average 2.2 pCi/L, 1,757 tests; First floor: average 1.3 pCi/L, 428 tests
19020Basement: average 3.6 pCi/L, 4,577 tests; First floor: average 2.1 pCi/L, 1,732 tests
19021Basement: average 2.9 pCi/L, 681 tests; First floor: average 1.5 pCi/L, 196 tests
19030Basement: average 3.5 pCi/L, 836 tests; First floor: average 2.5 pCi/L, 573 tests
19040Basement: average 3.4 pCi/L, 3,463 tests; First floor: average 1.9 pCi/L, 808 tests
19047Basement: average 3.7 pCi/L, 7,085 tests; First floor: average 2.0 pCi/L, 2,219 tests
19053Basement: average 4.1 pCi/L, 3,129 tests; First floor: average 2.7 pCi/L, 718 tests
19054Basement: average 3.4 pCi/L, 347 tests; First floor: average 1.5 pCi/L, 406 tests
19055Basement: average 4.0 pCi/L, 102 tests; First floor: average 1.2 pCi/L, 274 tests
19056Basement: average 1.9 pCi/L, 403 tests; First floor: average 1.7 pCi/L, 435 tests
19057Basement: average 2.1 pCi/L, 188 tests; First floor: average 1.5 pCi/L, 371 tests
19067Basement: average 3.9 pCi/L, 18,671 tests; First floor: average 2.1 pCi/L, 4,896 tests
19440Basement: average 3.4 pCi/L, 3,158 tests; First floor: average 1.6 pCi/L, 802 tests
19454Basement: average 3.7 pCi/L, 6,636 tests; First floor: average 1.9 pCi/L, 1,767 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.

Bucks County, Geology

The ground under Bucks County

Predicted

Most of the ground under Bucks County is one class on USGS's geologic map: 89.0% of its land is high radon potential, with 11.0% moderate. The map puts 82.0% of Bucks County in the area it calls Newark Basin and 10.6% in Atlantic Coastal Plain, with 2 smaller areas beside them. USGS gives the first a radon index of 12, in the high band (12 to 17), and the second 10, in the moderate band (9 to 11).

USGS's geologic areas under Bucks County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Newark BasinGray shale and fluvial sandstone.High1282.0%
Atlantic Coastal PlainGlacial deposits and marine sediments.Moderate1010.6%
Piedmont LowlandMica schist, phyllite, hornblende gneiss, and marble.High145.3%
HighlandsGlacial deposits, granite, pegmatites, and gneiss.High151.7%

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

Bucks County beside the ground around it

Bucks County has more high-potential ground than Pennsylvania as a whole: 89.0% of its land against 70.4%. Of the 8 counties that border it, 5 have more high-potential ground, Hunterdon County, NJ the most at 100%.

Share of land by USGS radon potential: Bucks County, the 8 counties bordering it and Pennsylvania
AreaEPA zoneLow potentialModerate potentialHigh potential
Bucks CountyZone 1None11.0%89.0%
Montgomery CountyZone 1NoneNone100%
Hunterdon County, NJZone 1NoneNone100%
Philadelphia CountyZone 3None63.6%36.5%
Mercer County, NJZone 1None49.5%50.5%
Lehigh CountyZone 1NoneNone100%
Northampton CountyZone 1NoneNone99.8%
Warren County, NJZone 1None4.6%95.4%
Burlington County, NJZone 276.3%23.7%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

Bucks County, Local resources

Radon testing and mitigation in Bucks County

Listed radon businesses with an address in Bucks County:

Listed radon professionals by town: Morrisville, Quakertown, Doylestown

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

Bucks County, Questions

Questions about radon in Bucks County

Are radon levels high in Bucks County?

In 2020, 23.2% of the radon tests reported to CDC for Bucks County, Pennsylvania were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.0 pCi/L. Of 63 Pennsylvania counties with 30 or more tests for the same period, 55 reported a higher share; pooled, the state comes to 30.3%.

Which counties border Bucks County?

Bucks County borders 8 counties: Montgomery County, PA, Hunterdon County, NJ, Philadelphia County, PA, Mercer County, NJ, Lehigh County, PA, Northampton County, PA, Warren County, NJ and Burlington County, NJ.

Products

Bucks County, Products

Testing a home in Bucks County

In Bucks County, 23.2% of 7,066 tests reported to CDC in 2020 reached 4 pCi/L, against 30.3% pooled across Pennsylvania. In Zone 1 the year-round level in Bucks 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

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

Explore

Bucks County, Bordering counties

Counties bordering Bucks County

Calculated by Radon411

Bucks County, Cities and towns

Cities and towns in Bucks County

Bucks County's population has barely moved since 2020: 647,828 residents on July 1, 2025 against 646,212 then, by the Census Bureau's estimates. Packed into its land, that is 1,072 people per square mile. No town dominates: Bristol, the largest, has 9,970 residents, 1.5% of the total. Testing is reported here more often than across the state: CDC's 7,066 reported tests for 2020 come to 10.9 for every 1,000 residents (2025 estimate), against 7.2 for Pennsylvania.

From Bristol to Silverdale, CDC publishes no figure by town: each reads Bucks County's.

The 12 largest cities and towns in Bucks County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Bristol9,970+1.2%1.5%
Morrisville9,665−1.3%1.5%
Perkasie9,312+1.9%1.4%
Quakertown9,235−1.4%1.4%
Doylestown8,330+0.4%1.3%
Telfordextends beyond Bucks County4,978+1.1%Counted whole
Sellersville4,501−1.5%0.7%
Chalfont4,419+3.5%0.7%
New Britain2,799−1.0%0.4%
New Hope2,629+0.5%0.4%
Yardley2,577−1.2%0.4%
Penndel2,507−0.2%0.4%
  • Dublin
  • Newtown
  • Tullytown
  • Langhorne
  • Langhorne Manor
  • Richlandtown
  • Hulmeville
  • Ivyland
  • Trumbauersville
  • Riegelsville
  • Silverdale

23 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 Bucks County is counted whole, so it has no share.

Bucks County, Homes

Homes in Bucks County

Of Bucks County's 256,416 homes, 64% are detached houses, against 57% across Pennsylvania; 13% are in buildings of five or more homes. Much of Bucks County is recent building: 15% of its homes have gone up since 2000 and the middle year built is 1975, against 1965 for Pennsylvania. 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 Bucks County, Pennsylvania, 2019 to 2023
HomesBucks CountyPennsylvania
Housing units256,4165,779,663
Detached houses64%57%
In buildings of 5 or more13%13%
Mobile homes2%4%
Built before 196030%45%
Built since 200015%14%
Middle year built19751965
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.