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Radon Levels in Carroll County, Georgia

EPA puts Carroll County in Zone 2, its middle radon zone, and high results are common there: 40.5% of the 190 radon tests reported to CDC (2008 to 2017, laboratory totals) 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

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  • Share at 4+ pCi/L

    40.5%

    15.7 pts above GA

    Carroll
    40.5%
    Georgia
    24.8%

    190 tests, 2008 to 2017

  • Median result

    3.4pCi/L

    Below action level

    Carroll
    3.4 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    190

    24th of 57 by tests

    Carroll
    190
    Fulton
    4,858

    Reported to CDC before any fix, 2008 to 2017

  • 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 Georgia

    8 of 57

    Top quarter

    Carroll
    40.5%
    Barrow
    48.3%

    By share, of 57 with 30+ tests

Read a result for Carroll County

Starts at Carroll County's median, 3.4 pCi/L

3.4pCi/L

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

EPA’s reading of 3.4 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. Carroll County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Carroll County, At a glance

Carroll County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Carroll 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 Carroll County, 2008 to 2017, laboratory

Reported results by concentration band, Carroll County, 2008 to 2017, laboratory
Under 2 pCi/L: 30%2 to 4 pCi/L: 30%4 pCi/L and above: 40%

Of 190 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Carroll County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L5730.0%
2 to 4 pCi/L5629.5%
4 pCi/L and above7740.5%
What these figures count

These are the 190 tests reported to CDC for Carroll 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

Carroll County, Compared

Carroll County radon figures, compared

Calculated by Radon411

In Carroll County, about 4 in 10 reported tests over the 2008 to 2017 laboratory totals (77 of 190) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 4.8 points higher. Across 129 Georgia counties pooled together, 24.8% of tests reached that level, so Carroll County runs 15.7 points above its state.

Of 5 neighbours with a figure, 1 reported a larger share at or above 4 pCi/L and 4 a smaller one; the spread is 18.8% (Cleburne County, AL) to 47.3% (Douglas County). By share, Carroll County is 8th of 57 Georgia counties with 30 or more tests for the same period.

Half the tests came in under 3.4 pCi/L and half over it; the single highest reached 46.5 pCi/L. Below the action level, 57 tests (30.0%) came in under 2 pCi/L, against 44.0% statewide, and 56 tests (29.5%) fell between 2 and 4, against 31.2% statewide.

Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 40.5% share point the same way here. USGS geology rates 100% of the county's land moderate radon potential. CDC also counts 9 tests taken after mitigation in Carroll County for the same period: tests in homes where a fix was already in.

CDC's ten-year totals for Carroll County went from 116 tests (2005 to 2014) to 190 (2008 to 2017), the share going from 38.8% to 40.5%.

Carroll County against Georgia, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Carroll County
Carroll County19040.5%3.4 pCi/LThis county
Georgia, pooled129 counties, pooled30,15224.8%Not pooled−15.7 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled−4.8 points
Barrow Countyhighest in the state32148.3%3.8 pCi/L+7.8 points
Richmond Countylowest in the state320.0%1.4 pCi/L−40.5 points
Douglas County, GAborders it35547.3%3.7 pCi/L+6.8 points
Randolph County, ALborders it1540.0%3.7 pCi/L−0.5 points
Haralson County, GAborders it2231.8%2.1 pCi/L−8.7 points
Heard County, GAborders it1926.3%1.8 pCi/L−14.2 points
Paulding County, GAborders it28926.0%2.3 pCi/L−14.5 points
Fulton County, GAborders it4,85820.8%2.2 pCi/L−19.7 points
Coweta County, GAborders it54819.2%2.0 pCi/L−21.3 points
Cleburne County, ALborders it6918.8%1.5 pCi/L−21.7 points
Where Carroll County's reported results fell, 2008 to 2017, laboratory, beside Georgia and the United States
ResultCarroll County testsCarroll County shareGeorgia shareU.S. shareAgainst Georgia
Under 2 pCi/L5730.0%44.0%39.6%−14.0 points
2 to 4 pCi/L5629.5%31.2%24.7%−1.7 points
4 pCi/L and above7740.5%24.8%35.7%+15.7 points
Carroll County ranked among the 57 Georgia counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Gilmer County3 of 5729046.6%3.8 pCi/L
Lumpkin County4 of 5713646.3%3.6 pCi/L
Fannin County5 of 5730044.7%3.5 pCi/L
Union County6 of 5727644.6%3.3 pCi/L
Walton County7 of 5783042.2%3.3 pCi/L
Carroll County8 of 5719040.5%3.4 pCi/L
Hart County9 of 5710740.2%3.4 pCi/L
Jackson County10 of 5746040.0%3.2 pCi/L
Hall County11 of 571,30339.8%3.2 pCi/L
Pickens County12 of 5713337.6%3.1 pCi/L
Habersham County13 of 5712837.5%3.1 pCi/L
Carroll County ten-year laboratory totals, against Georgia's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestGeorgia, pooledChange from the row before
2008 to 201719040.5%3.4 pCi/L46.5 pCi/L24.8%+2.9 points
2007 to 201616537.6%3.1 pCi/L46.5 pCi/L23.9%+0.5 points
2006 to 201515137.1%2.9 pCi/L36.3 pCi/L23.7%−1.7 points
2005 to 201411638.8%2.8 pCi/L20.8 pCi/L23.2%First on file

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

Carroll County, Geology

The ground under Carroll County

Predicted

USGS's geologic map puts all of Carroll County's mapped land in one class: moderate radon potential. All of it lies in the area the map calls Georgiabama Thrust Stack (South), to which USGS gives a radon index of 9, in the moderate band (9 to 11).

USGS's geologic areas under Carroll County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Georgiabama Thrust Stack (South)Schist, amphibolite and granite.Moderate9100%

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

Carroll County beside the ground around it

Carroll County has more moderate-potential ground than Georgia as a whole: 100% of its land against 26.5%. Of the 8 counties that border it, 3 have more high-potential ground, Cleburne County, AL the most at 88.1%.

Share of land by USGS radon potential: Carroll County, the 8 counties bordering it and Georgia
AreaEPA zoneLow potentialModerate potentialHigh potential
Carroll CountyZone 2None100%None
Haralson CountyZone 2None99.9%0.1%
Heard CountyZone 2None100%None
Douglas CountyZone 2None100%None
Cleburne County, ALZone 1None11.9%88.1%
Paulding CountyZone 2None100%None
Coweta CountyZone 2None100%None
Randolph County, ALZone 216.6%69.6%13.8%
Fulton CountyZone 1None100%None
Georgia159 counties, pooled by land areaVaries73.1%26.5%None

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

Local help

Carroll County, Local resources

Radon testing and mitigation in Carroll County

What Georgia's program says
Licensing of radon professionals
There are no laws mandating a mitigator receive certification in Georgia, however, many mitigators choose to get certified by one of two national programs.

What it means

Carroll County, Questions

Questions about radon in Carroll County

Are radon levels high in Carroll County?

Over the 2008 to 2017 laboratory totals, 40.5% of the radon tests reported to CDC for Carroll County, Georgia were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.4 pCi/L. Of 57 Georgia counties with 30 or more tests for the same period, 7 reported a higher share; pooled, the state comes to 24.8%.

Which counties border Carroll County?

Carroll County borders 8 counties: Haralson County, GA, Heard County, GA, Douglas County, GA, Cleburne County, AL, Paulding County, GA, Coweta County, GA, Randolph County, AL and Fulton County, GA.

Products

Carroll County, Products

Testing a home in Carroll County

In Carroll County, 40.5% of 190 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 24.8% pooled across Georgia. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Carroll County; a long-term test tells the year-round average.

Test kits and monitors3

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Best radon monitors for Carroll County homes, compared

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Carroll County, Bordering counties

Counties bordering Carroll County

Calculated by Radon411

Carroll County, Cities and towns

Cities and towns in Carroll County

Carroll County is growing: the Census Bureau puts it at 131,036 residents on July 1, 2025, up 9.8% from 119,394 in 2020. That works out to 263 people per square mile of land. Its largest town, Carrollton, has 27,925 residents, 21.3% of the total. Reported testing is thin here: 190 tests over 2008 to 2017, or 1.4 for every 1,000 residents (2025 estimate), where Georgia as a whole comes to 2.7.

From Carrollton to Roopville, CDC publishes no figure by town: each reads Carroll County's.

The cities and towns in Carroll County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Carrollton27,925+4.8%21.3%
Villa Ricaextends beyond Carroll County21,022+22.0%Counted whole
Bremenextends beyond Carroll County7,751+6.9%Counted whole
Templeextends beyond Carroll County6,564+30.4%Counted whole
Bowdon2,298+6.6%1.8%
Mount Zion2,057+16.4%1.6%
Whitesburg624+7.4%0.5%
Roopville239+8.1%0.2%

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

Carroll County, Homes

Homes in Carroll County

Of Carroll County's 47,170 homes, 72% are detached houses, against 66% across Georgia; 11% are mobile homes. Half of its homes were built before 1991, close to Georgia's 1991: 11% date from before 1960 and 32% from 2000 or later. 69% of occupied homes are lived in by their owner (Georgia: 65%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Carroll County, Georgia, 2019 to 2023
HomesCarroll CountyGeorgia
Housing units47,1704,483,873
Detached houses72%66%
In buildings of 5 or more8%16%
Mobile homes11%8%
Built before 196011%12%
Built since 200032%33%
Middle year built19911991
Owner-occupied69%65%

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