Skip to content
RADON411

Locations and reports

Radon Levels in Kershaw County, South Carolina

EPA puts Kershaw County in Zone 3, its lowest radon zone, and most reported tests there come back low, though 5.0% of 60 (2008 to 2017, laboratory totals) reached 4 pCi/L. Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

How to test this homeFind a certified tester

  • Share at 4+ pCi/L

    5.0%

    14.4 pts below SC

    Kershaw
    5.0%
    SC
    19.4%

    60 tests, 2008 to 2017

  • Median result

    0.7pCi/L

    Below action level

    Kershaw
    0.7 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    60

    21st of 24 by tests

    Kershaw
    60
    Greenville
    12,004

    Reported to CDC before any fix, 2008 to 2017

  • 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

    17 of 24

    Middle half

    Kershaw
    5.0%
    Oconee
    42.6%

    By share, of 24 with 30+ tests

Read a result for Kershaw County

Starts at Kershaw County's median, 0.7 pCi/L

0.7pCi/L

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

EPA’s reading of 0.7 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. Kershaw County's median reported result, 2008 to 2017.

Interpret this reading

The data

Kershaw County, At a glance

Kershaw County at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Kershaw 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 89% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

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

Reported results by concentration band, Kershaw County, 2008 to 2017, laboratory
Under 2 pCi/L: 88%2 to 4 pCi/L: 7%4 pCi/L and above: 5%

Of 60 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Kershaw County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L5388.3%
2 to 4 pCi/L46.7%
4 pCi/L and above35.0%
What these figures count

These are the 60 tests reported to CDC for Kershaw 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

Kershaw County, Compared

Kershaw County radon figures, compared

Calculated by Radon411

Kershaw County reports fewer high tests than South Carolina overall. 5.0% of its 60 tests over the 2008 to 2017 laboratory totals were at or above 4 pCi/L. That is 14.4 points below the 19.4% pooled from 46 South Carolina counties.

Ordered from highest share down, it comes 17th of 24 South Carolina counties with 30 or more tests for the same period. Nationally, every county with a figure for the same period pools to 35.7%; Kershaw County sits 30.7 points below it.

Next door, the shares run from 4.9% in Richland County to 13.6% in Lancaster County, with Richland County below Kershaw County. Zone 3 on EPA's map (predicted average under 2 pCi/L) and a 5.0% share point the same way here.

Half the tests came in under 0.7 pCi/L and half over it; the single highest reached 7.1 pCi/L. The rest split 88.3% under 2 pCi/L and 6.7% from 2 to 4 (South Carolina: 57.4% and 23.1%).

CDC's ten-year totals for Kershaw County went from 82 tests (2005 to 2014) to 60 (2008 to 2017), the share going from 3.7% to 5.0%.

Kershaw County against South Carolina, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Kershaw County
Kershaw County605.0%0.7 pCi/LThis county
South Carolina, pooled46 counties, pooled26,48119.4%Not pooled+14.4 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+30.7 points
Oconee Countyhighest in the state2,46942.6%3.3 pCi/L+37.6 points
Florence Countylowest in the state590.0%0.7 pCi/L−5.0 points
Lancaster County, SCborders it37413.6%1.6 pCi/L+8.6 points
Sumter County, SCborders it4211.9%1.3 pCi/L+6.9 points
Fairfield County, SCborders it277.4%0.9 pCi/L+2.4 points
Richland County, SCborders it6714.9%0.7 pCi/L−0.1 points
Chesterfield County, SCborders it100.0%0.6 pCi/L−5.0 points
Darlington County, SCborders it280.0%0.6 pCi/L−5.0 points
Lee County, SCborders it30.0%1.1 pCi/L−5.0 points
Where Kershaw County's reported results fell, 2008 to 2017, laboratory, beside South Carolina and the United States
ResultKershaw County testsKershaw County shareSouth Carolina shareU.S. shareAgainst South Carolina
Under 2 pCi/L5388.3%57.4%39.6%+30.9 points
2 to 4 pCi/L46.7%23.1%24.7%−16.4 points
4 pCi/L and above35.0%19.4%35.7%−14.4 points
Kershaw County ranked among the 24 South Carolina counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Lexington County12 of 2459112.5%0.9 pCi/L
Sumter County13 of 244211.9%1.3 pCi/L
Anderson County14 of 241,73311.1%1.1 pCi/L
Greenwood County15 of 241137.1%1.0 pCi/L
Orangeburg County16 of 24535.7%0.9 pCi/L
Kershaw County17 of 24605.0%0.7 pCi/L
Richland County18 of 246714.9%0.7 pCi/L
Dorchester County19 of 241044.8%1.0 pCi/L
Berkeley County20 of 24994.0%0.7 pCi/L
Beaufort County21 of 242462.0%0.7 pCi/L
Charleston County22 of 242721.5%0.6 pCi/L
Kershaw 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 2017605.0%0.7 pCi/L7.1 pCi/L19.4%+0.2 points
2007 to 2016844.8%0.6 pCi/L7.1 pCi/L19.3%Level
2006 to 2015844.8%0.6 pCi/L7.1 pCi/L19.8%+1.1 points
2005 to 2014823.7%0.6 pCi/L7.1 pCi/L19.8%First on file

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

Kershaw County, Geology

The ground under Kershaw County

Predicted

Most of the ground under Kershaw County is one class on USGS's geologic map: 88.7% of its land is low radon potential, with 11.3% moderate. The map puts 80.1% of Kershaw County in the area it calls Upper and Middle Coastal Plain and 11.3% in Carolina and Charlotte Belt Granites, with one smaller area beside them. USGS gives the first a radon index of 8, in the low band (5 to 8), and the second 11, in the moderate band (9 to 11).

USGS's geologic areas under Kershaw County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Upper and Middle Coastal PlainTertiary coastal plain sandy and silty sediments and marsh deposits.Low880.1%
Carolina and Charlotte Belt GranitesGranite and granite gneissModerate1111.3%
Carolina Slate Beltamphibolite, granitic gneiss, quartzite, muscovite schist, meta-argillite, metavolcanic rocks.Low88.6%

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

Kershaw County beside the ground around it

Across South Carolina 0.2% of the land is rated high; none of Kershaw County's is. Of the 7 counties that border it, 2 have more moderate-potential ground, Fairfield County the most at 20.8%.

Share of land by USGS radon potential: Kershaw County, the 7 counties bordering it and South Carolina
AreaEPA zoneLow potentialModerate potentialHigh potential
Kershaw CountyZone 388.7%11.3%None
Lee CountyZone 3100%NoneNone
Richland CountyZone 399.5%0.5%None
Chesterfield CountyZone 393.0%7.0%None
Fairfield CountyZone 379.2%20.8%None
Lancaster CountyZone 383.7%16.3%None
Sumter CountyZone 3100%NoneNone
Darlington CountyZone 3100%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

Kershaw County, Local resources

Radon testing and mitigation in Kershaw County

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

What it means

Kershaw County, Questions

Questions about radon in Kershaw County

Are radon levels high in Kershaw County?

Over the 2008 to 2017 laboratory totals, 5.0% of the radon tests reported to CDC for Kershaw County, South Carolina were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.7 pCi/L. Of 24 South Carolina counties with 30 or more tests for the same period, 16 reported a higher share; pooled, the state comes to 19.4%.

Which counties border Kershaw County?

Kershaw County borders 7 counties: Lee County, Richland County, Chesterfield County, Fairfield County, Lancaster County, Sumter County and Darlington County.

Products

Kershaw County, Products

Testing a home in Kershaw County

In Kershaw County, 5.0% of 60 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 19.4% 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 Kershaw County.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Kershaw County homes, compared

Explore

Kershaw County, Bordering counties

Counties bordering Kershaw County

Calculated by Radon411

Kershaw County, Cities and towns

Cities and towns in Kershaw County

Kershaw County is growing: the Census Bureau puts it at 73,166 residents on July 1, 2025, up 11.6% from 65,590 in 2020. That works out to 101 people per square mile of land. No town dominates: Camden, the largest, has 9,201 residents, 12.6% of the total. Together its 3 incorporated places hold 15.3% of those residents; the other 84.7% live outside any of them. Reported testing is thin here: 60 tests over 2008 to 2017, or 0.8 for every 1,000 residents (2025 estimate), where South Carolina as a whole comes to 4.8.

From Camden to Bethune, CDC publishes no figure by town: each reads Kershaw County's.

The cities and towns in Kershaw County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Camden9,201+17.9%12.6%
Elgin1,675+2.6%2.3%
Bethune339+9.4%0.5%

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).

Kershaw County, Homes

Homes in Kershaw County

Of Kershaw County's 29,623 homes, 72% are detached houses, against 64% across South Carolina; 22% are mobile homes. Half of its homes were built before 1991, close to South Carolina's 1991: 11% date from before 1960 and 33% from 2000 or later. Owners live in 82% of the occupied homes (South Carolina: 71%), so for most households a test and a fix are their own to order.

Homes in Kershaw County, South Carolina, 2019 to 2023
HomesKershaw CountySouth Carolina
Housing units29,6232,401,638
Detached houses72%64%
In buildings of 5 or more4%13%
Mobile homes22%15%
Built before 196011%13%
Built since 200033%35%
Middle year built19911991
Owner-occupied82%71%

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