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Radon Levels in Georgetown County, South Carolina

EPA puts Georgetown County in Zone 3, its lowest radon zone, and only 29 radon tests from it are on file with CDC (2008 to 2017, laboratory totals). 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

    3.2%

    16.1 pts below SC

    Georgetown
    3.2%
    SC
    19.3%

    31 tests, 2007 to 2016

  • Median result

    0.1pCi/L

    Below action level

    Georgetown
    0.1 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2007 to 2016

  • Tests reported

    31

    26th of 26 by tests

    Georgetown
    31
    Greenville
    11,402

    Reported to CDC before any fix, 2007 to 2016

  • EPA radon zone

    Zone 3

    Lower potential

    1. 1
    2. 2
    3. Zone 3

    1 highest, 3 lowest

    EPA predicts under 2 pCi/L indoors

  • Rank in SC

    22 of 26

    Lowest quarter

    Georgetown
    3.2%
    Oconee
    43.1%

    By share, of 26 with 30+ tests

Read a result for Georgetown County

Starts at Georgetown County's median, 0.1 pCi/L

0.2pCi/L

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

EPA’s reading of 0.2 pCi/L

Below 2 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 below 2 pCi/L, the level at which EPA says a fix should be considered. 0.1 pCi/L above Georgetown County's median of 0.1 pCi/L.

Interpret this reading

The data

Georgetown County, At a glance

Georgetown County at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Georgetown County as a whole is an average indoor of less than 2 pCi/L (less than 75 Bq/m³). A low zone clears no address in it: homes above EPA's turn up in all three zones.

USGS geologic potential: Low across 94% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Georgetown County, 2008 to 2017, laboratory

CDC holds 29 reported tests for Georgetown County over the 2008 to 2017 laboratory totals, with a median of 0.1 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Georgetown County beside the counties around it is how this page reads it.

What these figures count

Only 29 tests were reported to CDC for Georgetown County over 2008 to 2017 (laboratory totals), and tests are often run on homes being sold or already suspected of a problem: so few describe neither the county nor 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

Georgetown County, Compared

Georgetown County radon figures, compared

Calculated by Radon411

Only 1 of 31 radon tests reported for Georgetown County over the 2007 to 2016 laboratory totals reached 4 pCi/L (3.2%). The median result, 0.1 pCi/L, sits below 2, well under EPA's 4 pCi/L action level, and the top reported result was 9.1 pCi/L.

The newest figure, over the 2008 to 2017 laboratory totals, counts only 29 tests (0.0% at or above 4 pCi/L), too few to compare, so this reading uses the 31-test figure.

Across 46 South Carolina counties pooled together, 19.3% of tests reached that level, so Georgetown County runs 16.1 points below its state. Against the national pool of 35.8%, the gap is 32.6 points lower. Its place in the state: 22nd of 26 South Carolina counties with 30 or more tests for the same period.

Zone 3 on EPA's map (predicted average under 2 pCi/L) and a 3.2% share point the same way here. Of 3 neighbours with a figure, 1 reported a larger share at or above 4 pCi/L and 2 a smaller one; the spread is 1.1% (Horry County) to 4.5% (Berkeley County).

Below the action level, 29 tests (93.5%) came in under 2 pCi/L, against 58.0% statewide, and 1 tests (3.2%) fell between 2 and 4, against 22.6% statewide. USGS geology rates 94% of the county's land low radon potential.

CDC's ten-year totals for Georgetown County went from 31 tests (2005 to 2014) to 29 (2008 to 2017), the share going from 3.2% to 0.0%.

Georgetown County against South Carolina, the United States and nearby counties, 2007 to 2016, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Georgetown County
Georgetown County313.2%0.1 pCi/LThis county
South Carolina, pooled46 counties, pooled25,75519.3%Not pooled+16.1 points
United States, pooled2,666 counties, pooled1,939,02535.8%Not pooled+32.6 points
Oconee Countyhighest in the state2,34043.1%3.3 pCi/L+39.9 points
Florence Countylowest in the state540.0%0.6 pCi/L−3.2 points
Berkeley County, SCborders it894.5%0.7 pCi/L+1.3 points
Charleston County, SCborders it2512.0%0.6 pCi/L−1.2 points
Horry County, SCborders it911.1%0.6 pCi/L−2.1 points
Williamsburg County, SCborders it150.0%0.6 pCi/L−3.2 points
Marion County, SCborders it70.0%1.0 pCi/L−3.2 points
Where Georgetown County's reported results fell, 2007 to 2016, laboratory, beside South Carolina and the United States
ResultGeorgetown County testsGeorgetown County shareSouth Carolina shareU.S. shareAgainst South Carolina
Under 2 pCi/L2993.5%58.0%39.6%+35.5 points
2 to 4 pCi/L13.2%22.6%24.6%−19.4 points
4 pCi/L and above13.2%19.3%35.8%−16.1 points
Georgetown County ranked among the 26 South Carolina counties with 30 or more tests, by share at or above 4 pCi/L, 2007 to 2016, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Sumter County16 of 26535.7%1.3 pCi/L
Dorchester County17 of 26935.4%1.2 pCi/L
Kershaw County18 of 26844.8%0.6 pCi/L
Orangeburg County19 of 26644.7%0.8 pCi/L
Berkeley County20 of 26894.5%0.7 pCi/L
Richland County21 of 269254.2%0.7 pCi/L
Georgetown County22 of 26313.2%0.1 pCi/L
Beaufort County23 of 261912.6%0.6 pCi/L
Charleston County24 of 262512.0%0.6 pCi/L
Horry County25 of 26911.1%0.6 pCi/L
Florence County26 of 26540.0%0.6 pCi/L
Georgetown County ten-year laboratory totals, against South Carolina's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestSouth Carolina, pooledChange from the row before
2008 to 2017290.0%0.1 pCi/L2.2 pCi/L19.4%−3.2 points
2007 to 2016313.2%0.1 pCi/L9.1 pCi/L19.3%Level
2006 to 2015313.2%0.1 pCi/L9.1 pCi/L19.8%Level
2005 to 2014313.2%0.1 pCi/L9.1 pCi/L19.8%First on file

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

Georgetown County, Geology

The ground under Georgetown County

Predicted

USGS's geologic map puts all of Georgetown County's mapped land in one class: low radon potential. 93.9% of it lies in the area the map calls Lower Coastal Plain, to which USGS gives a radon index of 7, in the low band (5 to 8).

USGS's geologic areas under Georgetown County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Lower Coastal PlainDune, beach, and marine sediments.Low793.9%

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

Georgetown County beside the ground around it

Across South Carolina 0.2% of the land is rated high; none of Georgetown County's is. None of the 5 counties that border it has any moderate-potential ground either.

Share of land by USGS radon potential: Georgetown County, the 5 counties bordering it and South Carolina
AreaEPA zoneLow potentialModerate potentialHigh potential
Georgetown CountyZone 393.9%NoneNone
Williamsburg CountyZone 3100%NoneNone
Marion CountyZone 3100%NoneNone
Horry CountyZone 399.6%NoneNone
Berkeley CountyZone 399.4%NoneNone
Charleston CountyZone 393.5%NoneNone
South Carolina46 counties, pooled by land areaVaries80.8%18.2%0.2%

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

Local help

Georgetown County, Local resources

Radon testing and mitigation in Georgetown County

What South Carolina's program says
Phone
1-800-768-0362
Email
radon@des.sc.gov

What it means

Georgetown County, Questions

Questions about radon in Georgetown County

Are radon levels high in Georgetown County?

Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Georgetown County, South Carolina were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.1 pCi/L. Of 26 South Carolina counties with 30 or more tests for the same period, 21 reported a higher share; pooled, the state comes to 19.3%.

Which counties border Georgetown County?

Georgetown County borders 5 counties: Williamsburg County, Marion County, Horry County, Berkeley County and Charleston County.

Products

Georgetown County, Products

Testing a home in Georgetown County

In Georgetown County, 3.2% of 31 tests reported to CDC over the 2007 to 2016 laboratory totals reached 4 pCi/L, against 19.3% pooled across South Carolina. Zone 3 is the lowest label, yet homes at or above 4 pCi/L occur in every zone: a short-term kit (2 to 90 days) is the quick first check in Georgetown County.

Test kits and monitors3

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Best radon monitors for Georgetown County homes, compared

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Georgetown County, Bordering counties

Counties bordering Georgetown County

Calculated by Radon411

Georgetown County, Cities and towns

Cities and towns in Georgetown County

The Census Bureau estimates 65,912 residents in Georgetown County for July 1, 2025, 2,404 more than in 2020 (+3.8%). That works out to 81 people per square mile of land. No town dominates: Georgetown, the largest, has 8,869 residents, 13.5% of the total. Reported testing is thin here: 31 tests over 2007 to 2016, or 0.5 for every 1,000 residents (2025 estimate), where South Carolina as a whole comes to 4.6.

From Georgetown to Pawleys Island, CDC publishes no figure by town: each reads Georgetown County's.

The cities and towns in Georgetown County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Georgetown8,869+5.8%13.5%
Andrewsextends beyond Georgetown County2,522−2.6%Counted whole
Pawleys Island133+1.5%0.2%

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

Georgetown County, Homes

Homes in Georgetown County

Of Georgetown County's 36,704 homes, 62% are detached houses, against 64% across South Carolina; 17% are mobile homes. Half of its homes were built before 1991, close to South Carolina's 1991: 9% date from before 1960 and 32% from 2000 or later. Owners live in 83% of the occupied homes (South Carolina: 71%), so for most households a test and a fix are their own to order.

Homes in Georgetown County, South Carolina, 2019 to 2023
HomesGeorgetown CountySouth Carolina
Housing units36,7042,401,638
Detached houses62%64%
In buildings of 5 or more10%13%
Mobile homes17%15%
Built before 19609%13%
Built since 200032%35%
Middle year built19911991
Owner-occupied83%71%

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