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South Carolina Radon Map and Levels by County

South Carolina's counties span all three EPA radon zones. 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

    19.4%

    16.3 pts below U.S.

    South Carolina
    19.4%
    U.S.
    35.7%

    26,481 tests across 46 counties, 2008 to 2017

  • Rank among states

    39 of 47

    Ten lowest states

    South Carolina
    19.4%
    North Dakota
    59.3%

    By share, every state pooled the same way, 2008 to 2017

  • Counties in EPA Zone 1

    1 of 46

    Some at highest potential

    Zone 1
    1
    Zone 2
    8

    Most counties sit in Zone 3; Zone 1 is the highest potential

  • Highest county

    42.6%

    Oconee County

    Oconee
    42.6%
    Florence
    0.0%

    Counties with 30+ tests, 2008 to 2017

Read a result for South Carolina

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. 19.4% of South Carolina's reported tests reached 4 pCi/L, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

South Carolina, At a glance

South Carolina at a glance

Predicted: EPA radon zone

46 of 46 counties classified

EPA classifies counties, not states. Of the 46 counties in South Carolina with a zone, 1 is in Zone 1, 8 in Zone 2 and 37 in Zone 3.

  • Zone 1: Highest predicted potentialgreater than 4 pCi/L1 of 46 counties · 2.2%
  • Zone 2: Moderate predicted potential2 to 4 pCi/L8 of 46 counties · 17.4%
  • Zone 3: Lower predicted potentialless than 2 pCi/L37 of 46 counties · 80.4%

An EPA radon zone predicts a whole county. It is not intended to determine whether any individual home should be tested: homes with elevated levels occur in all three zones, and EPA recommends testing every home regardless of zone.

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

CDC test figures, county by county

CDC publishes South Carolina's radon test figures by county: 46 of its 46 counties have one. Each one's share is in the county list.

How to read these figures

South Carolina, Compared

South Carolina radon figures, compared

Calculated by Radon411
South Carolina, 2008 to 2017, laboratory
19.4%
of 26,481 tests at or above 4 pCi/L, pooled
Against the U.S.
−16.3points
35.7% pooled
Rank among the states
39 of 47
1 is the highest share
Counties with 30 or more tests
24
Highest
42.6%
Oconee County
Lowest
0.0%
Florence County

Fewer reported tests reach 4 pCi/L in South Carolina than in most states: 19.4% of 26,481 over the 2008 to 2017 laboratory totals, from 46 counties. Nationally the pooled share is 35.7%: 16.3 points higher than here. Among 47 states pooled the same way it ranks 39th, with Vermont (21.7%) above it and Alaska (18.2%) below.

Oconee County reports the highest share (42.6% of 2,469 tests) and Florence County the lowest (0.0%); the most tests came from Greenville County, 12,004 of them at 19.6%. EPA's 1993 map puts 1 of its 46 classified counties in Zone 1; the tests reported since bear that out at 19.4%.

By band, 1 county at 30% to 50%, 5 counties at 15% to 30%, 11 counties at 5% to 15%, 7 counties at under 5%. Across its 4 overlapping ten-year totals, the share went from 19.8% (2005 to 2014) to 19.4% (2008 to 2017), within 2 points, with 2006 to 2015 the highest at 19.8%.

South Carolina ranked among 47 states by pooled share of tests at or above 4 pCi/L, 2008 to 2017, laboratory
StateRankCountiesTestsAt or above 4 pCi/L
Nevada34 of 471610,93022.8%
Florida35 of 476253,79422.7%
North Carolina36 of 479973,13922.6%
Alabama37 of 476512,56921.9%
Vermont38 of 471410,60021.7%
South Carolina39 of 474626,48119.4%
Alaska40 of 47983018.2%
Arizona41 of 47133,58916.8%
Delaware42 of 47312,21416.7%
Oklahoma43 of 475281412.7%
California44 of 47569,41510.3%
South Carolina's highest and lowest counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/L
Oconee County1 of 242,46942.6%
Pickens County2 of 241,71723.6%
Abbeville County3 of 246622.7%
Greenville County4 of 2412,00419.6%
Spartanburg County5 of 243,28019.1%
Newberry County6 of 247516.0%
Laurens County7 of 2424413.9%
Cherokee County8 of 2415313.7%
Lancaster County9 of 2437413.6%
York County10 of 241,41213.6%
Florence County24 of 24590.0%
Horry County23 of 241060.9%
Charleston County22 of 242721.5%
Beaufort County21 of 242462.0%
Berkeley County20 of 24994.0%
South Carolina's counties with 30 or more tests, by their own share at or above 4 pCi/L, 2008 to 2017, laboratory
ShareCountiesTheir testsFor example
50% or more00None
30% to 50%12,469Oconee County
15% to 30%517,142Pickens County, Abbeville County, Greenville County
5% to 15%115,016Laurens County, Cherokee County, Lancaster County
Under 5%71,557Richland County, Dorchester County, Berkeley County
South Carolina ten-year laboratory totals, pooled, against the United States
PeriodCountiesTestsAt or above 4 pCi/LUnited StatesChange from the row before
2008 to 20174626,48119.4%35.7%+0.1 points
2007 to 20164625,75519.3%35.8%−0.5 points
2006 to 20154623,86319.8%36.3%Level
2005 to 20144621,84319.8%36.0%First on file

Pooled shares: Radon411's sum of CDC's county counts for one period. CDC publishes no state or national figure.

South Carolina, Counties

South Carolina counties by EPA zone

Predicted

The map of South Carolina, then its 46 counties zone by zone, each with its reported share at or above 4 pCi/L and a report of its own.

South Carolina radon map by county: EPA radon zones. Map of South Carolina's 46 counties shaded by EPA radon zone: Zone 1 in red-orange, Zone 2 in amber, Zone 3 in pale sand. 1 in Zone 1, 8 in Zone 2, 37 in Zone 3.
South Carolina radon map by countyEPA radon zones for South Carolina's counties: 1 county in Zone 1, 8 counties in Zone 2, 37 counties in Zone 3.A prediction for each county, not a reading of any home; elevated homes occur in all three zones.

The 12 highest in South Carolina, 2008 to 2017

Zone 1: highest predicted potential1

Local help

South Carolina, Local resources

Local resources in South Carolina

Who to ask in South Carolina: its radon program, test kits and professionals.

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

What it means

South Carolina, Questions

Questions about radon in South Carolina

Is radon a problem in South Carolina?

South Carolina has 46 counties on EPA's Map of Radon Zones: Zone 1, the highest predicted potential, for 1; Zone 2 for 8; Zone 3 for 37. Pooled from 46 counties, 19.4% of the 26,481 radon tests reported to CDC over the 2008 to 2017 laboratory totals were at or above 4 pCi/L, 39th of 47 states.

Which South Carolina counties are in EPA radon Zone 1?

1 county is in Zone 1: Greenville County.

Who does radon mitigation in South Carolina?

Radon411's South Carolina directory lists 2 radon businesses for testing, mitigation or both, each with the licensing list it was read from.

Which South Carolina counties have the highest radon?

By the share of reported tests at or above 4 pCi/L, 2008 to 2017, laboratory: Oconee County 42.6% (2,469 tests), Pickens County 23.6% (1,717 tests), Abbeville County 22.7% (66 tests), Greenville County 19.6% (12,004 tests), Spartanburg County 19.1% (3,280 tests).

Which EPA region is South Carolina in?

South Carolina is in EPA Region 4: Southeast.

Products

South Carolina, Products

Testing a home in South Carolina

19.4% of the 26,481 tests reported to CDC for South Carolina over the 2008 to 2017 laboratory totals reached 4 pCi/L: a short-term kit (2 to 90 days) gives a first answer in days, a long-term test the year-round average. A short-term kit (2 to 90 days) is the quick first check for a home in South Carolina; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for South Carolina homes, compared

Explore

Cities in South Carolina with their own page

Radon data is published by county, not by city. Each city page sets the figures of the counties the city lies in side by side.