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Radon Levels in Perry County, Tennessee

EPA puts Perry County in Zone 1, its highest radon zone, and 32.5% of its 40 reported radon tests (2008 to 2017, laboratory totals) 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

    32.5%

    0.8 pts below TN

    Perry
    32.5%
    Tennessee
    33.3%

    40 tests, 2008 to 2017

  • Median result

    2.0pCi/L

    Below action level

    Perry
    2.0 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    40

    71st of 80 by tests

    Perry
    40
    Davidson
    5,592

    Reported to CDC before any fix, 2008 to 2017

  • 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 Tennessee

    39 of 80

    Middle half

    Perry
    32.5%
    Jefferson
    56.8%

    By share, of 80 with 30+ tests

Read a result for Perry County

Starts at Perry 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. Perry County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Perry County, At a glance

Perry County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Perry 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 Perry County, 2008 to 2017, laboratory

Reported results by concentration band, Perry County, 2008 to 2017, laboratory
Under 2 pCi/L: 48%2 to 4 pCi/L: 20%4 pCi/L and above: 32%

Of 40 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Perry County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L1947.5%
2 to 4 pCi/L820.0%
4 pCi/L and above1332.5%
What these figures count

These are the 40 tests reported to CDC for Perry County over 2008 to 2017 (laboratory totals), 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: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).

How to read these figures

Perry County, Compared

Perry County radon figures, compared

Calculated by Radon411

In Perry County, about 3 in 10 reported tests over the 2008 to 2017 laboratory totals (13 of 40) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 3.2 points lower. Across 95 Tennessee counties pooled together, 33.3% of tests reached that level, so Perry County runs 0.8 points below its state.

Of 4 neighbours with a figure, 2 reported a larger share at or above 4 pCi/L and 2 a smaller one; the spread is 16.1% (Lewis County) to 35.0% (Hickman County). By share, Perry County is 39th of 80 Tennessee counties with 30 or more tests for the same period.

Half the tests came in under 2.0 pCi/L and half over it; the single highest reached 52.7 pCi/L. Below the action level, 19 tests (47.5%) came in under 2 pCi/L, against 42.4% statewide, and 8 tests (20.0%) fell between 2 and 4, against 24.3% statewide.

Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 32.5% share point the same way here. USGS geology rates 100% of the county's land high radon potential.

CDC's ten-year totals for Perry County went from 37 tests (2005 to 2014) to 40 (2008 to 2017), the share going from 32.4% to 32.5%.

Perry County against Tennessee, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Perry County
Perry County4032.5%2.0 pCi/LThis county
Tennessee, pooled95 counties, pooled31,06633.3%Not pooled+0.8 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+3.2 points
Jefferson Countyhighest in the state14656.8%4.7 pCi/L+24.3 points
Chester Countylowest in the state440.0%1.1 pCi/L−32.5 points
Hickman County, TNborders it12035.0%2.2 pCi/L+2.5 points
Benton County, TNborders it3033.3%2.0 pCi/L+0.8 points
Decatur County, TNborders it1729.4%1.7 pCi/L−3.1 points
Humphreys County, TNborders it10523.8%2.0 pCi/L−8.7 points
Lewis County, TNborders it5616.1%1.4 pCi/L−16.4 points
Wayne County, TNborders it267.7%1.7 pCi/L−24.8 points
Where Perry County's reported results fell, 2008 to 2017, laboratory, beside Tennessee and the United States
ResultPerry County testsPerry County shareTennessee shareU.S. shareAgainst Tennessee
Under 2 pCi/L1947.5%42.4%39.6%+5.1 points
2 to 4 pCi/L820.0%24.3%24.7%−4.3 points
4 pCi/L and above1332.5%33.3%35.7%−0.8 points
Perry County ranked among the 80 Tennessee counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
McMinn County34 of 8010634.0%2.8 pCi/L
Montgomery County35 of 8059733.8%2.3 pCi/L
Roane County36 of 8025833.7%2.5 pCi/L
Knox County37 of 802,45233.6%2.5 pCi/L
Benton County38 of 803033.3%2.0 pCi/L
Perry County39 of 804032.5%2.0 pCi/L
DeKalb County40 of 805930.5%3.1 pCi/L
Robertson County41 of 8027328.9%1.9 pCi/L
Marion County42 of 807428.4%1.6 pCi/L
Polk County43 of 804327.9%2.2 pCi/L
Trousdale County44 of 803327.3%1.8 pCi/L
Perry County ten-year laboratory totals, against Tennessee's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestTennessee, pooledChange from the row before
2008 to 20174032.5%2.0 pCi/L52.7 pCi/L33.3%+3.2 points
2007 to 20164129.3%1.7 pCi/L52.7 pCi/L33.4%−3.2 points
2006 to 20154032.5%2.0 pCi/L52.7 pCi/L33.4%+0.1 points
2005 to 20143732.4%2.0 pCi/L52.7 pCi/L33.2%First on file

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

Perry County, Geology

The ground under Perry County

Predicted

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

USGS's geologic areas under Perry County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Cherty HighlandCherty dolostone.High12100%

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

Perry County beside the ground around it

Perry County has more high-potential ground than Tennessee as a whole: 100% of its land against 47.2%. Of the 6 counties that border it, none has as large a share of high-potential ground; Lewis County comes nearest at 100%.

Share of land by USGS radon potential: Perry County, the 6 counties bordering it and Tennessee
AreaEPA zoneLow potentialModerate potentialHigh potential
Perry CountyZone 1NoneNone100%
Decatur CountyZone 2None32.7%67.3%
Lewis CountyZone 1NoneNone100%
Hickman CountyZone 1None21.2%78.8%
Humphreys CountyZone 1None41.6%58.4%
Wayne CountyZone 123.3%None76.7%
Benton CountyZone 2None34.2%65.8%
Tennessee95 counties, pooled by land areaVaries30.5%22.3%47.2%

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

Local help

Perry County, Local resources

Radon testing and mitigation in Perry County

What Tennessee's program says
Phone
1-800-232-1139
Email
TDEC.Radon@tn.gov

What it means

Perry County, Questions

Questions about radon in Perry County

Are radon levels high in Perry County?

Over the 2008 to 2017 laboratory totals, 32.5% of the radon tests reported to CDC for Perry County, Tennessee were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.0 pCi/L. Of 80 Tennessee counties with 30 or more tests for the same period, 38 reported a higher share; pooled, the state comes to 33.3%.

Which counties border Perry County?

Perry County borders 6 counties: Decatur County, Lewis County, Hickman County, Humphreys County, Wayne County and Benton County.

Products

Perry County, Products

Testing a home in Perry County

In Perry County, 32.5% of 40 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 33.3% pooled across Tennessee. In Zone 1 the year-round level in Perry 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

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

Explore

Perry County, Bordering counties

Counties bordering Perry County

Calculated by Radon411

Perry County, Cities and towns

Cities and towns in Perry County

Perry County is growing: the Census Bureau puts it at 9,126 residents on July 1, 2025, up 8.9% from 8,383 in 2020. That works out to 22 people per square mile of land. No town dominates: Linden, the largest, has 1,161 residents, 12.7% of the total. Together its 2 incorporated places hold 23.6% of those residents; the other 76.4% live outside any of them. CDC's 40 reported tests for 2008 to 2017 work out to 4.4 per 1,000 residents (2025 estimate), close to Tennessee's 4.2.

From Linden to Lobelville, CDC publishes no figure by town: each reads Perry County's.

The cities and towns in Perry County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Linden1,161+15.5%12.7%
Lobelville994+8.0%10.9%

2 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).

Perry County, Homes

Homes in Perry County

Of Perry County's 4,830 homes, 62% are detached houses, against 68% across Tennessee; 35% are mobile homes. Half of its homes were built before 1987, close to Tennessee's 1986: 17% date from before 1960 and 27% from 2000 or later. Owners live in 75% of the occupied homes (Tennessee: 67%), so for most households a test and a fix are their own to order.

Homes in Perry County, Tennessee, 2019 to 2023
HomesPerry CountyTennessee
Housing units4,8303,095,472
Detached houses62%68%
In buildings of 5 or more2%14%
Mobile homes35%8%
Built before 196017%18%
Built since 200027%29%
Middle year built19871986
Owner-occupied75%67%

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