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Radon Levels in Bennington County, Vermont

EPA puts Bennington County in Zone 2, its middle radon zone, and 29.5% of its 44 reported radon tests (2023) 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

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  • Share at 4+ pCi/L

    29.5%

    8.9 pts above VT

    Bennington
    29.5%
    Vermont
    20.6%

    44 tests, 2023

  • Median result

    2.0pCi/L

    Below action level

    Bennington
    2.0 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2023

  • Tests reported

    44

    12th of 12 by tests

    Bennington
    44
    Chittenden
    398

    Reported to CDC before any fix, 2023

  • 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 Vermont

    1 of 12

    Top quarter

    Bennington
    29.5%
    Bennington
    29.5%

    By share, of 12 with 30+ tests

Read a result for Bennington County

Starts at Bennington 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. Bennington County's median reported result, 2023.

Interpret this readingWhat a fix costs

The data

Bennington County, At a glance

Bennington County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Bennington 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 100% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Bennington County, 2023

Share of reported tests at or above 4 pCi/L, by year, Bennington County
Share of reported tests at or above 4 pCi/L, by year, Bennington County
YearShare of reported tests at or above 4 pCi/L
201416.7%
201525.9%
201622.2%
201717.0%
201819.5%
201920.4%
202017.7%
202128.1%
202217.1%
202329.5%

2023: 29.5%. Across these years the share ran from 16.7% to 29.5%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

These are the 44 tests reported to CDC for Bennington County over 2023, 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: 2023. Measured data period: 2005 to 2023 (every CDC figure on file).

How to read these figures

Bennington County, Compared

Bennington County radon figures, compared

Calculated by Radon411

Bennington County's 44 reported tests in 2023 had a middle value of 2.0 pCi/L and a maximum of 18.3 pCi/L, and 29.5% reached 4 pCi/L. Vermont as a whole (14 Vermont counties, pooled) comes to 20.6%: 8.9 points lower than here.

Among its state's counties it ranks 1st of 12 Vermont counties with 30 or more tests for the same period. Statewide for the same period, Orange County reported the highest share (26.4%) and Chittenden County the lowest (14.6%).

Below the action level, 22 tests (50.0%) came in under 2 pCi/L, against 56.8% statewide, and 9 tests (20.5%) fell between 2 and 4, against 22.5% statewide. The busiest year on file was 2022, with 123 tests reported; the quietest, 2015, had 27.

EPA's 1993 zone map puts Bennington County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land moderate radon potential.

Next door, the shares run from 18.5% in Rutland County to 22.4% in Windsor County, with Windsor County, Windham County and Rutland County below Bennington County. Over 9 years of annual figures the share rose 12.8 points, from 16.7% in 2014 to 29.5% in 2023; its peak was 29.5% in 2023.

Share of reported tests at or above 4 pCi/L by year, Bennington County against Vermont2014 to 2023, years with 30 or more tests: Bennington County 16.7% to 29.5%, the state's pooled share 20.6% in 2023.
Bennington CountyVermont, pooled
Share of reported tests at or above 4 pCi/L by year, Bennington County against Vermont: data table
YearTestsBennington County, at or above 4 pCi/LVermont, pooled
20143616.7%18.3%
20164522.2%15.9%
20175317.0%16.4%
20184119.5%15.8%
20194920.4%14.3%
20206217.7%16.5%
20216428.1%19.2%
202212317.1%19.4%
20234429.5%20.6%
Bennington County against Vermont, the United States and nearby counties, 2023
AreaTestsAt or above 4 pCi/LMedianDifference from Bennington County
Bennington County4429.5%2.0 pCi/LThis county
Vermont, pooled14 counties, pooled1,30020.6%Not pooled−8.9 points
United States, pooled642 counties, pooled128,74033.4%Not pooled+3.9 points
Orange Countyhighest in the state5326.4%2.5 pCi/L−3.1 points
Chittenden Countylowest in the state39814.6%1.3 pCi/L−14.9 points
Washington County, NYborders it250.0%10.6 pCi/L+20.5 points
Rensselaer County, NYborders it1926.3%1.9 pCi/L−3.2 points
Windsor County, VTborders it6722.4%1.6 pCi/L−7.1 points
Windham County, VTborders it6021.7%2.2 pCi/L−7.8 points
Rutland County, VTborders it13018.5%1.3 pCi/L−11.0 points
Where Bennington County's reported results fell, 2023, beside Vermont and the United States
ResultBennington County testsBennington County shareVermont shareU.S. shareAgainst Vermont
Under 2 pCi/L2250.0%56.8%41.4%−6.8 points
2 to 4 pCi/L920.5%22.5%25.2%−2.0 points
4 pCi/L and above1329.5%20.6%33.4%+8.9 points
Bennington County ranked among the 12 Vermont counties with 30 or more tests, by share at or above 4 pCi/L, 2023
CountyRankTestsAt or above 4 pCi/LMedian
Bennington County1 of 124429.5%2.0 pCi/L
Orange County2 of 125326.4%2.5 pCi/L
Washington County3 of 1219926.1%2.0 pCi/L
Franklin County4 of 124723.4%1.5 pCi/L
Lamoille County5 of 126222.6%1.8 pCi/L
Windsor County6 of 126722.4%1.6 pCi/L
Windham County7 of 126021.7%2.2 pCi/L
Orleans County8 of 125121.6%1.7 pCi/L
Caledonia County9 of 127621.1%2.0 pCi/L
Addison County10 of 128319.3%1.7 pCi/L
Rutland County11 of 1213018.5%1.3 pCi/L
Bennington County radon tests by year, against Vermont's pooled share
YearTestsAt or above 4 pCi/LMedianHighestVermont, pooledChange from the row before
20234429.5%2.0 pCi/L18.3 pCi/L20.6%+12.4 points
202212317.1%2.1 pCi/L11.3 pCi/L19.4%−11.0 points
20216428.1%1.6 pCi/L16.2 pCi/L19.2%+10.4 points
20206217.7%1.6 pCi/L14.3 pCi/L16.5%−2.7 points
20194920.4%1.6 pCi/L11.5 pCi/L14.3%+0.9 points
20184119.5%1.3 pCi/L12.4 pCi/L15.8%+2.5 points
20175317.0%1.3 pCi/L20.6 pCi/L16.4%−5.2 points
20164522.2%1.3 pCi/L14.4 pCi/L15.9%−3.7 points
20152725.9%1.5 pCi/L9.1 pCi/L15.5%+9.2 points
20143616.7%1.6 pCi/L18.7 pCi/L18.3%First on file

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

Bennington County, Geology

The ground under Bennington County

Predicted

USGS's geologic map puts all of Bennington County's mapped land in one class: moderate radon potential. The map puts 42.1% of Bennington County in the area it calls Green Mountains and 36.8% in Vermont Valley, with one smaller area beside them. USGS gives both a radon index of 11, in the moderate band (9 to 11).

USGS's geologic areas under Bennington County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Green MountainsProterozoic to Paleozoic metaigneous and metasedimentary rocks.Moderate1142.1%
Vermont ValleyCambrian metasedimentary rocks.Moderate1136.8%
Taconic MountainsCambrian-Ordovician metasedimentary rocks.Moderate1121.1%

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

Bennington County beside the ground around it

Bennington County has more moderate-potential ground than Vermont as a whole: 100% of its land against 87.8%. Of the 7 counties that border it, 2 have more high-potential ground, Rensselaer County, NY the most at 96.8%.

Share of land by USGS radon potential: Bennington County, the 7 counties bordering it and Vermont
AreaEPA zoneLow potentialModerate potentialHigh potential
Bennington CountyZone 2None100%None
Windham CountyZone 2None100%None
Rensselaer County, NYZone 1None3.2%96.8%
Washington County, NYZone 120.9%25.4%53.7%
Rutland CountyZone 210.4%89.6%None
Berkshire County, MAZone 2None100%None
Franklin County, MAZone 214.5%85.5%None
Windsor CountyZone 2None100%None
Vermont14 counties, pooled by land areaVaries12.2%87.8%None

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

Local help

Bennington County, Local resources

Radon testing and mitigation in Bennington County

What Vermont's program says
Phone
802-863-7220

What it means

Bennington County, Questions

Questions about radon in Bennington County

Are radon levels high in Bennington County?

In 2023, 29.5% of the radon tests reported to CDC for Bennington County, Vermont were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.0 pCi/L. Of 12 Vermont counties with 30 or more tests for the same period, none reported a higher share; pooled, the state comes to 20.6%.

Which counties border Bennington County?

Bennington County borders 7 counties: Windham County, VT, Rensselaer County, NY, Washington County, NY, Rutland County, VT, Berkshire County, MA, Franklin County, MA and Windsor County, VT.

Products

Bennington County, Products

Testing a home in Bennington County

In Bennington County, 29.5% of 44 tests reported to CDC in 2023 reached 4 pCi/L, against 20.6% pooled across Vermont. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Bennington County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Bennington County homes, compared

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Bennington County, Bordering counties

Counties bordering Bennington County

Calculated by Radon411

Bennington County, Cities and towns

Cities and towns in Bennington County

About 36,630 people live in Bennington County by the Census Bureau's estimate for July 1, 2025, 688 fewer than in 2020 (−1.8%). That works out to 54 people per square mile of land. No town dominates: North Bennington, the largest, has 1,688 residents, 4.6% of the total. Together its 3 incorporated places hold 7.0% of those residents; the other 93.0% live outside any of them. Reported testing is thin here: 44 tests over 2023, or 1.2 for every 1,000 residents (2025 estimate), where Vermont as a whole comes to 2.0.

From North Bennington to Old Bennington, CDC publishes no figure by town: each reads Bennington County's.

The cities and towns in Bennington County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
North Bennington1,688−1.7%4.6%
Manchester757−1.9%2.1%
Old Bennington122−4.7%0.3%

3 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).

Bennington County, Homes

Homes in Bennington County

Of Bennington County's 20,877 homes, 75% are detached houses, against 67% across Vermont; 7% are in buildings of five or more homes. Half of its homes were built before 1971, close to Vermont's 1976: 37% date from before 1960 and 13% from 2000 or later. Owners live in 76% of the occupied homes (Vermont: 73%), so for most households a test and a fix are their own to order.

Homes in Bennington County, Vermont, 2019 to 2023
HomesBennington CountyVermont
Housing units20,877337,072
Detached houses75%67%
In buildings of 5 or more7%11%
Mobile homes5%6%
Built before 196037%33%
Built since 200013%17%
Middle year built19711976
Owner-occupied76%73%

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