Skip to content
RADON411

Locations and reports

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

Predicted
1 of 46counties in Zone 1, EPA's highest radon zone
Measured
By countyCDC publishes South Carolina's test figures by county: 46 of 46 counties have one.
Your home
Test to knowNo area figure here is a reading of your home.
How to test this homeFind a certified tester

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 describes predicted potential across a whole county. It is not intended to determine whether any individual home should be tested, and homes with elevated levels occur in all three zones. EPA recommends testing every home regardless of zone, and testing is the only way to know the radon level in a specific building.

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.

South Carolina, Counties

South Carolina counties by EPA zone

Predicted

South Carolina's radon map, then all 46 counties by the zone EPA predicts for each, highest reported share of tests at or above 4 pCi/L first. Each has its own report.

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.Predicted potential for each county, not a reading of any home. Homes with elevated levels of radon have been found in all three zones.

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

Radon Action Brief

National Radon Action MonthPre-sale

The radon brief for your South Carolina county, in one dated file.

  • Your area's radon record, explained.
  • Your plan to test this week.
  • Fix costs and pros near you.

Save 64%Sale price: $8.99Price after the sale: $25Ends Jan 31Then $25

Get the briefSee a free sample

Area data, not a test of the building.

What it means

South Carolina, Questions

Questions about radon in South Carolina

Common questions

9 questions, answered from the figures above

Is radon a problem in South Carolina?

EPA's Map of Radon Zones places 1 of the 46 South Carolina counties it classifies in Zone 1, the highest predicted potential, 8 in Zone 2 and 37 in Zone 3. An EPA radon zone describes predicted potential across a whole county. It is not intended to determine whether any individual home should be tested, and homes with elevated levels occur in all three zones. EPA recommends testing every home regardless of zone, and testing is the only way to know the radon level in a specific building.

South Carolina on the radon mapRadon levels by state

Which South Carolina counties are in EPA radon Zone 1?

1 county is in Zone 1: Greenville County. Zone 1 is EPA's class for highest predicted potential, a predicted average indoor screening level greater than 4 pCi/L. A zone is a prediction for a county, not a measurement of any home.

Radon in Greenville County

How do I get a radon test in South Carolina?

EPA says you can test your home yourself or hire a qualified radon test company, and that either approach takes only a small amount of time and effort. The South Carolina radon program is the place to ask about certified testers and any test kit offer it runs.

How to test a homeFree and low-cost kits by stateSouth Carolina radon program

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. EPA recommends having a qualified contractor fix a home with a radon problem, because lowering high radon levels takes technical knowledge and special skills, and some states require the work to be done by a licensed or certified professional.

How radon mitigation worksWhat mitigation costsRadon professionals in South Carolina

Which South Carolina counties have the highest radon?

46 of South Carolina's 46 counties have an EPA radon zone published here. Radon411 will not rank counties on data it does not hold, and a zone is a prediction for an area rather than a measurement of any building.

What share of radon tests in South Carolina are high?

CDC has published no statewide radon testing statistics for South Carolina, so we cannot give a figure. Where CDC does publish one, the percentage describes radon tests reported to CDC, not homes.

Which EPA region is South Carolina in?

South Carolina is in EPA Region 4: Southeast.

Do I need to test my home in South Carolina?

Yes, wherever you live in the state. Testing is the only way to know the radon level in a specific building. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. EPA recommends considering a fix when the level is between 2 and 4 pCi/L.

Why does this page show coverage rather than one radon level for South Carolina?

A statewide figure averages counties with very different geology and very different numbers of reported tests, so it hides more than it shows. The county report is the level at which the EPA zone, the geologic potential and the reported testing statistics are actually published, which is why the county table above links to every one of them.

If you own, buy, sell or rent

What these figures mean for each reader, with the guide that covers it

The zone counts on this page describe counties across South Carolina. They are predictions for areas, and none of them measures your building.

South Carolina in figures

The figures above, said in words

What the published data says about South Carolina, in words. A zone and a share of tests describe an area, never the level in any one home.

    • Predicted

      Predicted

      EPA places 1 of South Carolina's 46 counties in Zone 1, 8 in Zone 2 and 37 in Zone 3.

      The Zone 1 county: Greenville County.

    • Compared

      Calculated by Radon411

      2% of South Carolina's counties with a zone on file are in Zone 1, a smaller share than across all U.S. counties (34%). It is a share of counties, not of land, people or homes.

  • Reported tests

    Measured

    CDC has no statewide testing figure for South Carolina on file here.

    46 of the 46 counties have a published county figure; the most tests in each one's latest year were reported for Greenville County (12,004 tests over 2008 to 2017, laboratory), Spartanburg County (3,280 tests over 2008 to 2017, laboratory) and Oconee County (2,469 tests over 2008 to 2017, laboratory).

  • Local record

    South Carolina's radon program is the South Carolina Radon Program, run by South Carolina Department of Environmental Services; its contacts are under Local resources.

    One city has a page setting the figures of the counties it lies in side by side: Seneca.

Products

South Carolina, Products

Testing and mitigation products

Whatever the figures for South Carolina show, only a test tells you about one home.

Test kits and monitors42

See all products

As an Amazon Associate, Radon411 earns from qualifying purchases.

Best radon monitors for South Carolina homes, compared

Testing

5

Mitigation

3

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.

South Carolina, Next steps

What to do next

  1. LearnKnow what radon isWhat radon is, how it gets indoors, and why a county zone is not a reading for your home.Learn about radon
  2. TestTest the building you live inShort-term or long-term, where the device goes, and closed-house conditions.How to test
  3. FixBring a high level downHow a mitigation system works, and the retest that confirms it.How mitigation works
  4. Find a proHire a certified professionalMeasurement and mitigation professionals by state, with their certifications.Find a professional

Informational. Follow EPA guidance. EPA says all radon tests should be taken for a minimum of 48 hours, with windows and doors closed from 12 hours before a short-term test.