Radon levels in North Carolina

Verified county-level radon indicators are available for 99 North Carolina counties. Select a county for its source period and sample details.

High results are most common in Transylvania County (48%) and least common in Richmond County (0%)Share of tests at or above 4 pCi/L by county · Radon test results from laboratories, 2008–2017 · 99 of 100 counties have data
Alamance County: 4% of tests at or above 4 pCi/L · 520 testsAlexander County: 33% of tests at or above 4 pCi/L · 311 testsAlleghany County: 41% of tests at or above 4 pCi/L · 285 testsAnson County: 0% of tests at or above 4 pCi/L · 18 testsAshe County: 34% of tests at or above 4 pCi/L · 681 testsAvery County: 39% of tests at or above 4 pCi/L · 160 testsBeaufort County: 0% of tests at or above 4 pCi/L · 23 testsBertie County: 25% of tests at or above 4 pCi/L · 4 testsBladen County: 0% of tests at or above 4 pCi/L · 14 testsBrunswick County: 0% of tests at or above 4 pCi/L · 62 testsBuncombe County: 29% of tests at or above 4 pCi/L · 6,359 testsBurke County: 28% of tests at or above 4 pCi/L · 940 testsCabarrus County: 9% of tests at or above 4 pCi/L · 880 testsCaldwell County: 28% of tests at or above 4 pCi/L · 861 testsCamden County: no dataCarteret County: 0% of tests at or above 4 pCi/L · 41 testsCaswell County: 15% of tests at or above 4 pCi/L · 47 testsCatawba County: 25% of tests at or above 4 pCi/L · 1,259 testsChatham County: 11% of tests at or above 4 pCi/L · 587 testsCherokee County: 43% of tests at or above 4 pCi/L · 1,045 testsChowan County: 0% of tests at or above 4 pCi/L · 9 testsClay County: 43% of tests at or above 4 pCi/L · 323 testsCleveland County: 40% of tests at or above 4 pCi/L · 511 testsColumbus County: 0% of tests at or above 4 pCi/L · 31 testsCraven County: 0% of tests at or above 4 pCi/L · 109 testsCumberland County: 2% of tests at or above 4 pCi/L · 160 testsCurrituck County: 0% of tests at or above 4 pCi/L · 8 testsDare County: 27% of tests at or above 4 pCi/L · 41 testsDavidson County: 26% of tests at or above 4 pCi/L · 1,265 testsDavie County: 17% of tests at or above 4 pCi/L · 694 testsDuplin County: 0% of tests at or above 4 pCi/L · 5 testsDurham County: 4% of tests at or above 4 pCi/L · 1,570 testsEdgecombe County: 0% of tests at or above 4 pCi/L · 9 testsForsyth County: 29% of tests at or above 4 pCi/L · 6,273 testsFranklin County: 19% of tests at or above 4 pCi/L · 204 testsGaston County: 19% of tests at or above 4 pCi/L · 593 testsGates County: 0% of tests at or above 4 pCi/L · 1 testsGraham County: 42% of tests at or above 4 pCi/L · 69 testsGranville County: 10% of tests at or above 4 pCi/L · 153 testsGreene County: 0% of tests at or above 4 pCi/L · 7 testsGuilford County: 8% of tests at or above 4 pCi/L · 6,870 testsHalifax County: 42% of tests at or above 4 pCi/L · 59 testsHarnett County: 1% of tests at or above 4 pCi/L · 181 testsHaywood County: 31% of tests at or above 4 pCi/L · 1,872 testsHenderson County: 42% of tests at or above 4 pCi/L · 4,093 testsHertford County: 0% of tests at or above 4 pCi/L · 2 testsHoke County: 0% of tests at or above 4 pCi/L · 19 testsHyde County: 0% of tests at or above 4 pCi/L · 4 testsIredell County: 22% of tests at or above 4 pCi/L · 1,146 testsJackson County: 28% of tests at or above 4 pCi/L · 1,026 testsJohnston County: 8% of tests at or above 4 pCi/L · 668 testsJones County: 0% of tests at or above 4 pCi/L · 1 testsLee County: 1% of tests at or above 4 pCi/L · 93 testsLenoir County: 0% of tests at or above 4 pCi/L · 15 testsLincoln County: 29% of tests at or above 4 pCi/L · 708 testsMcDowell County: 38% of tests at or above 4 pCi/L · 776 testsMacon County: 17% of tests at or above 4 pCi/L · 1,354 testsMadison County: 17% of tests at or above 4 pCi/L · 228 testsMartin County: 0% of tests at or above 4 pCi/L · 4 testsMecklenburg County: 8% of tests at or above 4 pCi/L · 3,753 testsMitchell County: 29% of tests at or above 4 pCi/L · 433 testsMontgomery County: 20% of tests at or above 4 pCi/L · 103 testsMoore County: 19% of tests at or above 4 pCi/L · 99 testsNash County: 0% of tests at or above 4 pCi/L · 30 testsNew Hanover County: 3% of tests at or above 4 pCi/L · 117 testsNorthampton County: 40% of tests at or above 4 pCi/L · 62 testsOnslow County: 3% of tests at or above 4 pCi/L · 188 testsOrange County: 11% of tests at or above 4 pCi/L · 1,095 testsPamlico County: 0% of tests at or above 4 pCi/L · 1 testsPasquotank County: 38% of tests at or above 4 pCi/L · 8 testsPender County: 12% of tests at or above 4 pCi/L · 17 testsPerquimans County: 0% of tests at or above 4 pCi/L · 5 testsPerson County: 17% of tests at or above 4 pCi/L · 190 testsPitt County: 1% of tests at or above 4 pCi/L · 101 testsPolk County: 30% of tests at or above 4 pCi/L · 594 testsRandolph County: 7% of tests at or above 4 pCi/L · 422 testsRichmond County: 0% of tests at or above 4 pCi/L · 52 testsRobeson County: 4% of tests at or above 4 pCi/L · 53 testsRockingham County: 27% of tests at or above 4 pCi/L · 835 testsRowan County: 18% of tests at or above 4 pCi/L · 626 testsRutherford County: 26% of tests at or above 4 pCi/L · 511 testsSampson County: 0% of tests at or above 4 pCi/L · 13 testsScotland County: 3% of tests at or above 4 pCi/L · 31 testsStanly County: 25% of tests at or above 4 pCi/L · 229 testsStokes County: 22% of tests at or above 4 pCi/L · 592 testsSurry County: 33% of tests at or above 4 pCi/L · 855 testsSwain County: 44% of tests at or above 4 pCi/L · 116 testsTransylvania County: 48% of tests at or above 4 pCi/L · 3,862 testsTyrrell County: 0% of tests at or above 4 pCi/L · 1 testsUnion County: 11% of tests at or above 4 pCi/L · 836 testsVance County: 15% of tests at or above 4 pCi/L · 109 testsWake County: 10% of tests at or above 4 pCi/L · 9,694 testsWarren County: 43% of tests at or above 4 pCi/L · 82 testsWashington County: 0% of tests at or above 4 pCi/L · 1 testsWatauga County: 45% of tests at or above 4 pCi/L · 1,215 testsWayne County: 8% of tests at or above 4 pCi/L · 49 testsWilkes County: 44% of tests at or above 4 pCi/L · 402 testsWilson County: 0% of tests at or above 4 pCi/L · 17 testsYadkin County: 29% of tests at or above 4 pCi/L · 199 testsYancey County: 31% of tests at or above 4 pCi/L · 290 tests
  • Under 10%
  • 10–20%
  • 20–30%
  • 30–40%
  • 40% or more
  • No data

Counties

CountyTests% ≥ 4 pCi/LMedian (pCi/L)EPA zone (1993)Source
Alamance County5204%0.5Zone 3Radon test results from laboratories through 2017
Alexander County31133%2.5Zone 2Radon test results from laboratories through 2017
Alleghany County28541%3.3Zone 1Radon test results from laboratories through 2017
Anson County180%0.6Zone 3Radon test results from laboratories through 2017
Ashe County68134%2.5Zone 2Radon test results from laboratories through 2017
Avery County16039%2.8Zone 2Radon test results from laboratories through 2017
Beaufort County230%0.1Zone 3Radon test results from laboratories through 2017
Bertie County425%1.1Zone 3Radon test results from laboratories through 2017
Bladen County140%0.1Zone 3Radon test results from laboratories through 2017
Brunswick County620%0.5Zone 3Radon test results from laboratories through 2017
Buncombe County6,35929%2.3Zone 1Radon test results from laboratories through 2017
Burke County94028%2.4Zone 2Radon test results from laboratories through 2017
Cabarrus County8809%1.0Zone 3Radon test results from laboratories through 2017
Caldwell County86128%2.5Zone 2Radon test results from laboratories through 2017
Camden County———Zone 3—
Carteret County410%0.1Zone 3Radon test results from laboratories through 2017
Caswell County4715%1.6Zone 2Radon test results from laboratories through 2017
Catawba County1,25925%2.0Zone 2Radon test results from laboratories through 2017
Chatham County58711%1.1Zone 3Radon test results from laboratories through 2017
Cherokee County1,04543%3.4Zone 1Radon test results from laboratories through 2017
Chowan County90%0.1Zone 3Radon test results from laboratories through 2017
Clay County32343%3.0Zone 2Radon test results from laboratories through 2017
Cleveland County51140%2.8Zone 2Radon test results from laboratories through 2017
Columbus County310%0.1Zone 3Radon test results from laboratories through 2017
Craven County1090%0.2Zone 3Radon test results from laboratories through 2017
Cumberland County1602%0.7Zone 3Radon test results from laboratories through 2017
Currituck County80%0.3Zone 3Radon test results from laboratories through 2017
Dare County4127%0.1Zone 3Radon test results from laboratories through 2017
Davidson County1,26526%1.8Zone 3Radon test results from laboratories through 2017
Davie County69417%1.7Zone 3Radon test results from laboratories through 2017
Duplin County50%0.1Zone 3Radon test results from laboratories through 2017
Durham County1,5704%0.7Zone 3Radon test results from laboratories through 2017
Edgecombe County90%0.1Zone 3Radon test results from laboratories through 2017
Forsyth County6,27329%2.3Zone 2Radon test results from laboratories through 2017
Franklin County20419%1.4Zone 2Radon test results from laboratories through 2017
Gaston County59319%1.5Zone 2Radon test results from laboratories through 2017
Gates County10%0.1Zone 3Radon test results from laboratories through 2017
Graham County6942%3.0Zone 2Radon test results from laboratories through 2017
Granville County15310%0.8Zone 3Radon test results from laboratories through 2017
Greene County70%0.1Zone 3Radon test results from laboratories through 2017
Guilford County6,8708%0.9Zone 3Radon test results from laboratories through 2017
Halifax County5942%2.6Zone 3Radon test results from laboratories through 2017
Harnett County1811%0.6Zone 3Radon test results from laboratories through 2017
Haywood County1,87231%2.2Zone 2Radon test results from laboratories through 2017
Henderson County4,09342%3.3Zone 1Radon test results from laboratories through 2017
Hertford County20%0.4Zone 3Radon test results from laboratories through 2017
Hoke County190%0.8Zone 3Radon test results from laboratories through 2017
Hyde County40%0.1Zone 3Radon test results from laboratories through 2017
Iredell County1,14622%1.8Zone 2Radon test results from laboratories through 2017
Jackson County1,02628%2.2Zone 2Radon test results from laboratories through 2017
Johnston County6688%0.7Zone 3Radon test results from laboratories through 2017
Jones County10%1.8Zone 3Radon test results from laboratories through 2017
Lee County931%0.9Zone 3Radon test results from laboratories through 2017
Lenoir County150%0.1Zone 3Radon test results from laboratories through 2017
Lincoln County70829%2.4Zone 2Radon test results from laboratories through 2017
Macon County1,35417%1.4Zone 2Radon test results from laboratories through 2017
Madison County22817%1.3Zone 2Radon test results from laboratories through 2017
Martin County40%0.6Zone 3Radon test results from laboratories through 2017
McDowell County77638%2.7Zone 2Radon test results from laboratories through 2017
Mecklenburg County3,7538%0.9Zone 3Radon test results from laboratories through 2017
Mitchell County43329%2.1Zone 1Radon test results from laboratories through 2017
Montgomery County10320%1.5Zone 3Radon test results from laboratories through 2017
Moore County9919%1.3Zone 3Radon test results from laboratories through 2017
Nash County300%0.2Zone 3Radon test results from laboratories through 2017
New Hanover County1173%0.1Zone 3Radon test results from laboratories through 2017
Northampton County6240%3.4Zone 3Radon test results from laboratories through 2017
Onslow County1883%0.5Zone 3Radon test results from laboratories through 2017
Orange County1,09511%1.1Zone 3Radon test results from laboratories through 2017
Pamlico County10%0.1Zone 3Radon test results from laboratories through 2017
Pasquotank County838%0.6Zone 3Radon test results from laboratories through 2017
Pender County1712%0.1Zone 3Radon test results from laboratories through 2017
Perquimans County50%0.8Zone 3Radon test results from laboratories through 2017
Person County19017%1.3Zone 3Radon test results from laboratories through 2017
Pitt County1011%0.1Zone 3Radon test results from laboratories through 2017
Polk County59430%2.4Zone 2Radon test results from laboratories through 2017
Randolph County4227%0.9Zone 3Radon test results from laboratories through 2017
Richmond County520%0.6Zone 3Radon test results from laboratories through 2017
Robeson County534%0.8Zone 3Radon test results from laboratories through 2017
Rockingham County83527%2.1Zone 1Radon test results from laboratories through 2017
Rowan County62618%1.4Zone 3Radon test results from laboratories through 2017
Rutherford County51126%2.4Zone 2Radon test results from laboratories through 2017
Sampson County130%0.6Zone 3Radon test results from laboratories through 2017
Scotland County313%1.0Zone 3Radon test results from laboratories through 2017
Stanly County22925%2.2Zone 3Radon test results from laboratories through 2017
Stokes County59222%1.8Zone 2Radon test results from laboratories through 2017
Surry County85533%2.4Zone 2Radon test results from laboratories through 2017
Swain County11644%3.4Zone 2Radon test results from laboratories through 2017
Transylvania County3,86248%3.7Zone 1Radon test results from laboratories through 2017
Tyrrell County10%0.1Zone 3Radon test results from laboratories through 2017
Union County83611%1.1Zone 3Radon test results from laboratories through 2017
Vance County10915%1.5Zone 2Radon test results from laboratories through 2017
Wake County9,69410%1.0Zone 2Radon test results from laboratories through 2017
Warren County8243%3.0Zone 2Radon test results from laboratories through 2017
Washington County10%0.1Zone 3Radon test results from laboratories through 2017
Watauga County1,21545%3.5Zone 1Radon test results from laboratories through 2017
Wayne County498%0.6Zone 3Radon test results from laboratories through 2017
Wilkes County40244%3.5Zone 2Radon test results from laboratories through 2017
Wilson County170%0.4Zone 3Radon test results from laboratories through 2017
Yadkin County19929%2.2Zone 2Radon test results from laboratories through 2017
Yancey County29031%1.9Zone 2Radon test results from laboratories through 2017

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