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Radon Levels in Union County, Georgia

EPA puts Union County in Zone 2, its middle radon zone, and high results are common there: 44.6% of the 276 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

    44.6%

    19.8 pts above GA

    Union
    44.6%
    Georgia
    24.8%

    276 tests, 2008 to 2017

  • Median result

    3.3pCi/L

    Below action level

    Union
    3.3 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    276

    20th of 57 by tests

    Union
    276
    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

    6 of 57

    Top quarter

    Union
    44.6%
    Barrow
    48.3%

    By share, of 57 with 30+ tests

Read a result for Union County

Starts at Union County's median, 3.3 pCi/L

3.3pCi/L

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

EPA’s reading of 3.3 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. Union County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Union County, At a glance

Union County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Union 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 Union County, 2008 to 2017, laboratory

Reported results by concentration band, Union County, 2008 to 2017, laboratory
Under 2 pCi/L: 27%2 to 4 pCi/L: 28%4 pCi/L and above: 45%

Of 276 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Union County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L7527.2%
2 to 4 pCi/L7828.3%
4 pCi/L and above12344.6%
What these figures count

These are the 276 tests reported to CDC for Union 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

Union County, Compared

Union County radon figures, compared

Calculated by Radon411

In Union County, about 4 in 10 reported tests over the 2008 to 2017 laboratory totals (123 of 276) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 8.9 points higher. Across 129 Georgia counties pooled together, 24.8% of tests reached that level, so Union County runs 19.8 points above its state.

Of 6 neighbours with a figure, 2 reported a larger share at or above 4 pCi/L and 4 a smaller one; the spread is 25.3% (White County) to 46.3% (Lumpkin County). By share, Union County is 6th of 57 Georgia counties with 30 or more tests for the same period.

Half the tests came in under 3.3 pCi/L and half over it; the single highest reached 35.5 pCi/L. Below the action level, 75 tests (27.2%) came in under 2 pCi/L, against 44.0% statewide, and 78 tests (28.3%) 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 44.6% share point the same way here. USGS geology rates 100% of the county's land moderate radon potential. CDC also counts 24 tests taken after mitigation in Union County for the same period: tests in homes where a fix was already in.

CDC's ten-year totals for Union County went from 133 tests (2005 to 2014) to 276 (2008 to 2017), the share going from 42.1% to 44.6%.

Union County against Georgia, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Union County
Union County27644.6%3.3 pCi/LThis county
Georgia, pooled129 counties, pooled30,15224.8%Not pooled−19.8 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled−8.9 points
Barrow Countyhighest in the state32148.3%3.8 pCi/L+3.7 points
Richmond Countylowest in the state320.0%1.4 pCi/L−44.6 points
Lumpkin County, GAborders it13646.3%3.6 pCi/L+1.7 points
Fannin County, GAborders it30044.7%3.5 pCi/L+0.1 points
Cherokee County, NCborders it1,04543.2%3.4 pCi/L−1.4 points
Clay County, NCborders it32343.0%3.0 pCi/L−1.6 points
Towns County, GAborders it14431.9%2.8 pCi/L−12.7 points
White County, GAborders it9125.3%2.7 pCi/L−19.3 points
Where Union County's reported results fell, 2008 to 2017, laboratory, beside Georgia and the United States
ResultUnion County testsUnion County shareGeorgia shareU.S. shareAgainst Georgia
Under 2 pCi/L7527.2%44.0%39.6%−16.8 points
2 to 4 pCi/L7828.3%31.2%24.7%−2.9 points
4 pCi/L and above12344.6%24.8%35.7%+19.8 points
Union 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
Barrow County1 of 5732148.3%3.8 pCi/L
Douglas County2 of 5735547.3%3.7 pCi/L
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
Union County ten-year laboratory totals, against Georgia's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestGeorgia, pooledChange from the row before
2008 to 201727644.6%3.3 pCi/L35.5 pCi/L24.8%+6.7 points
2007 to 201619837.9%3.0 pCi/L35.5 pCi/L23.9%Level
2006 to 201517437.9%3.0 pCi/L35.5 pCi/L23.7%−4.2 points
2005 to 201413342.1%3.2 pCi/L35.5 pCi/L23.2%First on file

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

Union County, Geology

The ground under Union County

Predicted

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

USGS's geologic areas under Union County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Georgiabama Thrust Stack (North)Gneiss, phyllite, and schist.Moderate9100%

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

Union County beside the ground around it

Union County has more moderate-potential ground than Georgia as a whole: 100% of its land against 26.5%. Of the 6 counties that border it, none has as large a share of moderate-potential ground; Cherokee County, NC comes nearest at 100%.

Share of land by USGS radon potential: Union County, the 6 counties bordering it and Georgia
AreaEPA zoneLow potentialModerate potentialHigh potential
Union CountyZone 2None100%None
Fannin CountyZone 2None100%None
Towns CountyZone 2None100%None
White CountyZone 2None100%None
Lumpkin CountyZone 2None100%None
Clay County, NCZone 2None100%None
Cherokee County, NCZone 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

Union County, Local resources

Radon testing and mitigation in Union 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

Union County, Questions

Questions about radon in Union County

Are radon levels high in Union County?

Over the 2008 to 2017 laboratory totals, 44.6% of the radon tests reported to CDC for Union County, Georgia were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.3 pCi/L. Of 57 Georgia counties with 30 or more tests for the same period, 5 reported a higher share; pooled, the state comes to 24.8%.

Which counties border Union County?

Union County borders 6 counties: Fannin County, GA, Towns County, GA, White County, GA, Lumpkin County, GA, Clay County, NC and Cherokee County, NC.

Products

Union County, Products

Testing a home in Union County

In Union County, 44.6% of 276 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 Union County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Union County homes, compared

Explore

Union County, Bordering counties

Counties bordering Union County

Calculated by Radon411

Union County, Cities and towns

Cities and towns in Union County

Union County is growing: the Census Bureau puts it at 27,859 residents on July 1, 2025, up 12.3% from 24,808 in 2020. That works out to 86 people per square mile of land. Blairsville, its one incorporated place, has 878 residents, 3.2% of the total. Testing is reported here more often than across the state: CDC's 276 reported tests for 2008 to 2017 come to 9.9 for every 1,000 residents (2025 estimate), against 2.7 for Georgia.

Blairsville is the one incorporated place here; CDC publishes no figure by town, so it reads Union County's.

Blairsville, Union County: residents on July 1, 2025
PlaceResidentsSince 2020Share of residents
Blairsville878+39.1%3.2%

One incorporated place, 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).

Union County, Homes

Homes in Union County

Union County is a place of houses on their own lots: 79% of its 14,952 homes are detached single-family houses, against 66% across Georgia. Half of its homes were built before 1994, close to Georgia's 1991: 6% date from before 1960 and 38% from 2000 or later. Owners live in 83% of the occupied homes (Georgia: 65%), so for most households a test and a fix are their own to order.

Homes in Union County, Georgia, 2019 to 2023
HomesUnion CountyGeorgia
Housing units14,9524,483,873
Detached houses79%66%
In buildings of 5 or more4%16%
Mobile homes15%8%
Built before 19606%12%
Built since 200038%33%
Middle year built19941991
Owner-occupied83%65%

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