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Radon Levels in Chesterfield County, South Carolina

EPA puts Chesterfield County in Zone 3, its lowest radon zone, and only 10 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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  • Highest bordering

    13.6%

    Lancaster County

    Lancaster
    13.6%
    Richmond
    0.0%

    4 of 7 neighbours have 30+ tests, 2008 to 2017

  • Nearest county

    13.6%

    Lancaster County, 31 miles

    Lancaster
    13.6%
    SC
    19.4%

    Share at 4+ pCi/L, 374 tests, 2008 to 2017

  • Ground above low

    7.0%

    11.4 pts below SC

    Chesterfield
    7.0%
    SC
    18.5%

    Share of land USGS rates moderate or high potential

  • Tests reported

    17

    Too few for a share

    Chesterfield
    17
    Needed
    30

    2006 to 2015, laboratory

  • 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

Read a result for Chesterfield County

Starts at EPA's action level

4.0pCi/L

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

EPA’s reading of 4.0 pCi/L

At or above 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 at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher.

Interpret this readingWhat a fix costs

The data

Chesterfield County, At a glance

Chesterfield County at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Chesterfield 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 93% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

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

CDC holds 10 reported tests for Chesterfield County over the 2008 to 2017 laboratory totals, with a median of 0.6 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Chesterfield County beside the counties around it is how this page reads it.

What these figures count

Only 10 tests were reported to CDC for Chesterfield 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

Chesterfield County, Compared

Chesterfield County radon figures, compared

Calculated by Radon411

CDC's largest figure for Chesterfield County rests on 17 tests over the 2006 to 2015 laboratory totals, 0 of them at or above 4 pCi/L, so each test moves its share by 5.9 points and no rank or comparison is drawn from it. Results reached as high as 2.0 pCi/L, with a middle value of 0.6 pCi/L.

Of the counties bordering it, 4 have a figure over the 2008 to 2017 laboratory totals: Lancaster County reported the largest share at or above 4 pCi/L, 13.6%, and Richmond County, NC the smallest, 0.0%, with Union County, NC at 11.2% and Kershaw County at 5.0% between. Farther out, Florence County (50 miles away) at 0.0%, Sumter County (51 miles away) at 11.9% and Richland County (60 miles away) at 4.9% have figures too. Pooled across 46 South Carolina counties, 19.4% of reported tests reached that level; across every county in the country with a figure, 35.7%.

Statewide for the same period, Oconee County reported the highest share (42.6%) and Florence County the lowest (0.0%). EPA's 1993 map puts Chesterfield County in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 93% of the county's land low radon potential.

South Carolina, the United States and the counties around Chesterfield County, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedian
South Carolina, pooled46 counties, pooled26,48119.4%Not pooled
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled
Oconee Countyhighest in the state2,46942.6%3.3 pCi/L
Florence Countylowest in the state590.0%0.7 pCi/L
Lancaster County, SCborders it37413.6%1.6 pCi/L
Union County, NCborders it83611.2%1.1 pCi/L
Kershaw County, SCborders it605.0%0.7 pCi/L
Darlington County, SCborders it280.0%0.6 pCi/L
Richmond County, NCborders it520.0%0.6 pCi/L
Anson County, NCborders it180.0%0.6 pCi/L
Marlboro County, SCborders it70.0%0.9 pCi/L
The nearest South Carolina counties to Chesterfield County with 30 or more tests, 2008 to 2017, laboratory
CountyDistanceTestsAt or above 4 pCi/LMedian
Lancaster County31 mi37413.6%1.6 pCi/L
Kershaw County32 mi605.0%0.7 pCi/L
Florence County50 mi590.0%0.7 pCi/L
Sumter County51 mi4211.9%1.3 pCi/L
Richland County60 mi6714.9%0.7 pCi/L
York County63 mi1,41213.6%1.2 pCi/L
Lexington County82 mi59112.5%0.9 pCi/L
Horry County83 mi1060.9%0.6 pCi/L
Chesterfield 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 2017100.0%0.6 pCi/L2.0 pCi/L19.4%Level
2007 to 2016150.0%0.6 pCi/L2.0 pCi/L19.3%Level
2006 to 2015170.0%0.6 pCi/L2.0 pCi/L19.8%Level
2005 to 2014150.0%0.7 pCi/L2.0 pCi/L19.8%First on file

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

Chesterfield County, Geology

The ground under Chesterfield County

Predicted

Most of the ground under Chesterfield County is one class on USGS's geologic map: 93.0% of its land is low radon potential, with 7.0% moderate. The map puts 85.5% of Chesterfield County in the area it calls Upper and Middle Coastal Plain and 6.9% in Carolina Slate Belt, with 2 smaller areas beside them. USGS gives both a radon index of 8, in the low band (5 to 8).

USGS's geologic areas under Chesterfield County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Upper and Middle Coastal PlainTertiary coastal plain sandy and silty sediments and marsh deposits.Low885.5%
Carolina Slate Beltamphibolite, granitic gneiss, quartzite, muscovite schist, meta-argillite, metavolcanic rocks.Low86.9%
Carolina Slate BeltFelsic metavolcanics, intermediate volcanics, metamudstone, argillite, and epiclastic rocks.Moderate95.0%
Carolina and Charlotte Belt GranitesGranite and granite gneissModerate112.1%

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

Chesterfield County beside the ground around it

Across South Carolina 0.2% of the land is rated high; none of Chesterfield County's is. Of the 7 counties that border it, 4 have more moderate-potential ground, Anson County, NC the most at 31.1%.

Share of land by USGS radon potential: Chesterfield County, the 7 counties bordering it and South Carolina
AreaEPA zoneLow potentialModerate potentialHigh potential
Chesterfield CountyZone 393.0%7.0%None
Darlington CountyZone 3100%NoneNone
Marlboro CountyZone 3100%NoneNone
Anson County, NCZone 368.9%31.1%None
Kershaw CountyZone 388.7%11.3%None
Richmond County, NCZone 378.0%22.0%None
Lancaster CountyZone 383.7%16.3%None
Union County, NCZone 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

Chesterfield County, Local resources

Radon testing and mitigation in Chesterfield County

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

What it means

Chesterfield County, Questions

Questions about radon in Chesterfield County

Are radon levels high in Chesterfield County?

Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Chesterfield County, South Carolina were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.6 pCi/L. Of the counties bordering it, 4 have a figure over the 2008 to 2017 laboratory totals: Lancaster County reported the largest share at or above 4 pCi/L, 13.6%, and Richmond County, NC the smallest, 0.0%, with Union County, NC at 11.2% and Kershaw County at 5.0% between.

Which counties border Chesterfield County?

Chesterfield County borders 7 counties: Darlington County, SC, Marlboro County, SC, Anson County, NC, Kershaw County, SC, Richmond County, NC, Lancaster County, SC and Union County, NC.

Products

Chesterfield County, Products

Testing a home in Chesterfield County

No CDC figure names Chesterfield County; the nearest county with one, Lancaster County (31 miles away), reported 13.6% of its tests at or above 4 pCi/L over the 2008 to 2017 laboratory totals, the only reading nearby until a test of this home. 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 Chesterfield County.

Test kits and monitors3

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Best radon monitors for Chesterfield County homes, compared

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Chesterfield County, Bordering counties

Counties bordering Chesterfield County

Calculated by Radon411

Chesterfield County, Cities and towns

Cities and towns in Chesterfield County

The Census Bureau estimates 44,740 residents in Chesterfield County for July 1, 2025, 1,484 more than in 2020 (+3.4%). That works out to 56 people per square mile of land. No town dominates: Cheraw, the largest, has 4,921 residents, 11.0% of the total. Together its 8 incorporated places hold 25.0% of those residents; the other 75.0% live outside any of them. Reported testing is thin here: 17 tests over 2006 to 2015, or 0.4 for every 1,000 residents (2025 estimate), where South Carolina as a whole comes to 4.3.

From Cheraw to Mount Croghan, CDC publishes no figure by town: each reads Chesterfield County's.

The cities and towns in Chesterfield County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Cheraw4,921−1.6%11.0%
Pageland2,518+2.2%5.6%
Chesterfield1,357+1.0%3.0%
McBee820+4.2%1.8%
Jefferson797+3.4%1.8%
Ruby323+3.2%0.7%
Patrick288+3.6%0.6%
Mount Croghan139+3.0%0.3%

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).

Chesterfield County, Homes

Homes in Chesterfield County

Mobile homes are 40% of Chesterfield County's 20,655 homes and detached houses 54%, against 64% across South Carolina. Half of its homes were built before 1986, close to South Carolina's 1991: 16% date from before 1960 and 21% from 2000 or later. 72% of occupied homes are lived in by their owner (South Carolina: 71%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Chesterfield County, South Carolina, 2019 to 2023
HomesChesterfield CountySouth Carolina
Housing units20,6552,401,638
Detached houses54%64%
In buildings of 5 or more2%13%
Mobile homes40%15%
Built before 196016%13%
Built since 200021%35%
Middle year built19861991
Owner-occupied72%71%

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