Skip to content
RADON411

Locations and reports

Radon Levels in Juniata County, Pennsylvania

EPA puts Juniata County in Zone 1, its highest radon zone, and high results are common there: 52.9% of the 87 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

    52.9%

    22.6 pts above PA

    Juniata
    52.9%
    PA
    30.3%

    87 tests, 2020

  • Median result

    4.4pCi/L

    Action level reached

    Juniata
    4.4 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2020

  • Tests reported

    87

    59th of 63 by tests

    Juniata
    87
    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

    6 of 63

    Top quarter

    Juniata
    52.9%
    Perry
    57.7%

    By share, of 63 with 30+ tests

Read a result for Juniata County

Starts at Juniata County's median, 4.4 pCi/L

4.4pCi/L

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

EPA’s reading of 4.4 pCi/L

At or above 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 at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. Juniata County's median reported result, 2020.

Interpret this readingWhat a fix costs

The data

Juniata County, At a glance

Juniata County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Juniata 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 100% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Juniata County, 2020

Share of reported tests at or above 4 pCi/L, by year, Juniata County
Share of reported tests at or above 4 pCi/L, by year, Juniata County
YearShare of reported tests at or above 4 pCi/L
201469.4%
201569.0%
201665.7%
201763.9%
201851.6%
201950.9%
202052.9%

2020: 52.9%. Across these years the share ran from 50.9% to 69.4%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

These are the 87 tests reported to CDC for Juniata 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

Juniata County, Compared

Juniata County radon figures, compared

Calculated by Radon411

More than half: 52.9% of the 87 radon tests reported to CDC for Juniata County in 2020 read at least 4 pCi/L. That places it 6th of 63 Pennsylvania counties with 30 or more tests for the same period. That is 22.6 points above the 30.3% pooled from 67 Pennsylvania counties.

The median result, 4.4 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 99.0 pCi/L. The rest split 31.0% under 2 pCi/L and 16.1% from 2 to 4 (Pennsylvania: 44.3% and 25.4%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 52.9% share point the same way here.

2 of its 7 bordering counties with figures ran higher, led by Perry County at 57.7%; Dauphin County reported 36.9%. Statewide for the same period, Perry County reported the highest share (57.7%) and Philadelphia County the lowest (10.6%).

The busiest year on file was 2015, with 158 tests reported; the quietest, 2017, had 83.

Over 7 years of annual figures the share fell 16.5 points, from 69.4% in 2014 to 52.9% in 2020; its peak was 69.4% in 2014. Nationally, every county with a figure for the same period pools to 25.5%; Juniata County sits 27.4 points above it.

Share of reported tests at or above 4 pCi/L by year, Juniata County against Pennsylvania2014 to 2020, years with 30 or more tests: Juniata County 69.4% to 52.9%, the state's pooled share 30.3% in 2020.
Juniata CountyPennsylvania, pooled
Share of reported tests at or above 4 pCi/L by year, Juniata County against Pennsylvania: data table
YearTestsJuniata County, at or above 4 pCi/LPennsylvania, pooled
201411169.4%36.1%
201515869.0%37.8%
201610865.7%34.4%
20178363.9%35.1%
20189151.6%30.5%
201911250.9%31.4%
20208752.9%30.3%
Juniata County against Pennsylvania, the United States and nearby counties, 2020
AreaTestsAt or above 4 pCi/LMedianDifference from Juniata County
Juniata County8752.9%4.4 pCi/LThis county
Pennsylvania, pooled67 counties, pooled93,66930.3%Not pooled−22.6 points
United States, pooled915 counties, pooled405,35525.5%Not pooled−27.4 points
Lebanon Countyhighest in the state1,10254.2%4.8 pCi/L+1.3 points
Philadelphia Countylowest in the state8,44210.6%1.7 pCi/L−42.3 points
Perry County, PAborders it18957.7%4.9 pCi/L+4.8 points
Huntingdon County, PAborders it10054.0%4.5 pCi/L+1.1 points
Northumberland County, PAborders it27549.8%3.9 pCi/L−3.1 points
Franklin County, PAborders it1,05942.6%3.1 pCi/L−10.3 points
Snyder County, PAborders it9942.4%2.8 pCi/L−10.5 points
Mifflin County, PAborders it11141.4%2.7 pCi/L−11.5 points
Dauphin County, PAborders it2,98636.9%2.0 pCi/L−16.0 points
Where Juniata County's reported results fell, 2020, beside Pennsylvania and the United States
ResultJuniata County testsJuniata County sharePennsylvania shareU.S. shareAgainst Pennsylvania
Under 2 pCi/L2731.0%44.3%51.6%−13.3 points
2 to 4 pCi/L1416.1%25.4%22.9%−9.3 points
4 pCi/L and above4652.9%30.3%25.5%+22.6 points
Juniata 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
Perry County1 of 6318957.7%4.9 pCi/L
Lebanon County2 of 631,10254.2%4.8 pCi/L
Clinton County3 of 6313354.1%4.5 pCi/L
Huntingdon County4 of 6310054.0%4.5 pCi/L
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
Juniata County radon tests by year, against Pennsylvania's pooled share
YearTestsAt or above 4 pCi/LMedianHighestPennsylvania, pooledChange from the row before
20208752.9%4.4 pCi/L99.0 pCi/L30.3%+2.0 points
201911250.9%4.4 pCi/L124.9 pCi/L31.4%−0.7 points
20189151.6%4.4 pCi/L186.0 pCi/L30.5%−12.3 points
20178363.9%6.4 pCi/L56.8 pCi/L35.1%−1.8 points
201610865.7%7.8 pCi/L136.7 pCi/L34.4%−3.3 points
201515869.0%6.6 pCi/L216.4 pCi/L37.8%−0.4 points
201411169.4%6.4 pCi/L166.1 pCi/L36.1%First on file

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

Juniata County, State data

Pennsylvania's own radon test data

Measured

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

Pennsylvania DEP publishes its figures by ZIP code, not by county. These are the 14 ZIP codes that lie wholly or partly in Juniata County, each with the state's own figures for it. Period: Period not stated by DEP.

ZIP codes in Juniata County
ZIP codeWhat the state reports
17014Basement: figures not shown; First floor: figures not shown
17021Basement: figures not shown; First floor: figures not shown
17035Basement: figures not shown; First floor: figures not shown
17045Basement: average 18.9 pCi/L, 254 tests; First floor: average 15.8 pCi/L, 42 tests
17049Basement: average 12.7 pCi/L, 203 tests; First floor: figures not shown
17056Basement: figures not shown
17058Basement: average 10.4 pCi/L, 93 tests; First floor: figures not shown
17059Basement: average 13.2 pCi/L, 483 tests; First floor: average 7.8 pCi/L, 37 tests
17062Basement: average 16.1 pCi/L, 295 tests; First floor: average 7.5 pCi/L, 38 tests
17082Basement: average 9.0 pCi/L, 189 tests; First floor: figures not shown
17086Basement: average 12.7 pCi/L, 83 tests; First floor: figures not shown
17094Basement: average 16.4 pCi/L, 140 tests; First floor: figures not shown
17243Basement: average 11.2 pCi/L, 37 tests; First floor: figures not shown
17853Basement: average 15.0 pCi/L, 93 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.

Juniata County, Geology

The ground under Juniata County

Predicted

USGS's geologic map puts all of Juniata County's mapped land in one class: high radon potential. All of it lies in the area the map calls Appalachian Mountain Section, to which USGS gives a radon index of 12, in the high band (12 to 17).

USGS's geologic areas under Juniata County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Appalachian Mountain SectionPaleozoic sandstone, shale, and limestone.High12100%

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

Juniata County beside the ground around it

Juniata County has more high-potential ground than Pennsylvania as a whole: 100% of its land against 70.4%. Of the 7 counties that border it, none has as large a share of high-potential ground; Huntingdon County comes nearest at 100%.

Share of land by USGS radon potential: Juniata County, the 7 counties bordering it and Pennsylvania
AreaEPA zoneLow potentialModerate potentialHigh potential
Juniata CountyZone 1NoneNone100%
Mifflin CountyZone 1NoneNone100%
Perry CountyZone 1NoneNone100%
Huntingdon CountyZone 1NoneNone100%
Franklin CountyZone 16.2%None93.8%
Snyder CountyZone 1NoneNone100%
Dauphin CountyZone 1NoneNone100%
Northumberland CountyZone 1NoneNone100%
Pennsylvania67 counties, pooled by land areaVaries0.7%28.9%70.4%

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

Local help

Juniata County, Local resources

Radon testing and mitigation in Juniata 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

Juniata County, Questions

Questions about radon in Juniata County

Are radon levels high in Juniata County?

In 2020, 52.9% of the radon tests reported to CDC for Juniata County, Pennsylvania were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.4 pCi/L. Of 63 Pennsylvania counties with 30 or more tests for the same period, 5 reported a higher share; pooled, the state comes to 30.3%.

Which counties border Juniata County?

Juniata County borders 7 counties: Mifflin County, Perry County, Huntingdon County, Franklin County, Snyder County, Dauphin County and Northumberland County.

Products

Juniata County, Products

Testing a home in Juniata County

In Juniata County, 52.9% of 87 tests reported to CDC in 2020 reached 4 pCi/L, against 30.3% pooled across Pennsylvania. In Zone 1 the year-round level in Juniata 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

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

Explore

Juniata County, Bordering counties

Counties bordering Juniata County

Calculated by Radon411

Juniata County, Cities and towns

Cities and towns in Juniata County

Juniata County's population has barely moved since 2020: 23,403 residents on July 1, 2025 against 23,476 then, by the Census Bureau's estimates. That works out to 60 people per square mile of land. No town dominates: Mifflintown, the largest, has 819 residents, 3.5% of the total. Together its 4 incorporated places hold 11.8% of those residents; the other 88.2% live outside any of them. Reported testing is thin here: 87 tests over 2020, or 3.7 for every 1,000 residents (2025 estimate), where Pennsylvania as a whole comes to 7.2.

From Mifflintown to Mifflin, CDC publishes no figure by town: each reads Juniata County's.

The cities and towns in Juniata County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Mifflintown819−2.4%3.5%
Port Royal797−2.1%3.4%
Thompsontown628+1.3%2.7%
Mifflin515−2.5%2.2%

4 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).

Juniata County, Homes

Homes in Juniata County

Juniata County is a place of houses on their own lots: 76% of its 10,502 homes are detached single-family houses, against 57% across Pennsylvania. Much of Juniata County is recent building: 15% of its homes have gone up since 2000 and the middle year built is 1974, against 1965 for Pennsylvania. 73% 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 Juniata County, Pennsylvania, 2019 to 2023
HomesJuniata CountyPennsylvania
Housing units10,5025,779,663
Detached houses76%57%
In buildings of 5 or more7%13%
Mobile homes10%4%
Built before 196037%45%
Built since 200015%14%
Middle year built19741965
Owner-occupied73%69%

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