Radon levels in Indiana

Verified county-level radon indicators are available for 92 Indiana counties. Select a county for its source period and sample details.

High results are most common in Miami County (63%) and least common in Jasper County (14%)Share of tests at or above 4 pCi/L by county · Radon test results from laboratories, 2008–2017 · 92 of 92 counties have data
Adams County: 48% of tests at or above 4 pCi/L · 66 testsAllen County: 42% of tests at or above 4 pCi/L · 3,990 testsBartholomew County: 49% of tests at or above 4 pCi/L · 1,707 testsBenton County: 62% of tests at or above 4 pCi/L · 34 testsBlackford County: 36% of tests at or above 4 pCi/L · 11 testsBoone County: 40% of tests at or above 4 pCi/L · 614 testsBrown County: 26% of tests at or above 4 pCi/L · 112 testsCarroll County: 61% of tests at or above 4 pCi/L · 38 testsCass County: 34% of tests at or above 4 pCi/L · 91 testsClark County: 48% of tests at or above 4 pCi/L · 512 testsClay County: 26% of tests at or above 4 pCi/L · 23 testsClinton County: 46% of tests at or above 4 pCi/L · 85 testsCrawford County: 30% of tests at or above 4 pCi/L · 10 testsDaviess County: 34% of tests at or above 4 pCi/L · 58 testsDearborn County: 30% of tests at or above 4 pCi/L · 136 testsDecatur County: 33% of tests at or above 4 pCi/L · 63 testsDeKalb County: 57% of tests at or above 4 pCi/L · 242 testsDelaware County: 55% of tests at or above 4 pCi/L · 187 testsDubois County: 44% of tests at or above 4 pCi/L · 136 testsElkhart County: 46% of tests at or above 4 pCi/L · 2,856 testsFayette County: 77% of tests at or above 4 pCi/L · 13 testsFloyd County: 42% of tests at or above 4 pCi/L · 316 testsFountain County: 55% of tests at or above 4 pCi/L · 60 testsFranklin County: 28% of tests at or above 4 pCi/L · 50 testsFulton County: 46% of tests at or above 4 pCi/L · 97 testsGibson County: 43% of tests at or above 4 pCi/L · 120 testsGrant County: 58% of tests at or above 4 pCi/L · 79 testsGreene County: 33% of tests at or above 4 pCi/L · 49 testsHamilton County: 38% of tests at or above 4 pCi/L · 3,479 testsHancock County: 34% of tests at or above 4 pCi/L · 271 testsHarrison County: 62% of tests at or above 4 pCi/L · 221 testsHendricks County: 42% of tests at or above 4 pCi/L · 1,170 testsHenry County: 51% of tests at or above 4 pCi/L · 95 testsHoward County: 49% of tests at or above 4 pCi/L · 216 testsHuntington County: 44% of tests at or above 4 pCi/L · 169 testsJackson County: 27% of tests at or above 4 pCi/L · 88 testsJasper County: 14% of tests at or above 4 pCi/L · 71 testsJay County: 44% of tests at or above 4 pCi/L · 9 testsJefferson County: 46% of tests at or above 4 pCi/L · 72 testsJennings County: 35% of tests at or above 4 pCi/L · 57 testsJohnson County: 39% of tests at or above 4 pCi/L · 556 testsKnox County: 43% of tests at or above 4 pCi/L · 58 testsKosciusko County: 51% of tests at or above 4 pCi/L · 1,248 testsLaGrange County: 42% of tests at or above 4 pCi/L · 120 testsLake County: 23% of tests at or above 4 pCi/L · 1,198 testsLaPorte County: 58% of tests at or above 4 pCi/L · 792 testsLawrence County: 36% of tests at or above 4 pCi/L · 267 testsMadison County: 49% of tests at or above 4 pCi/L · 239 testsMarion County: 40% of tests at or above 4 pCi/L · 3,668 testsMarshall County: 40% of tests at or above 4 pCi/L · 383 testsMartin County: 38% of tests at or above 4 pCi/L · 8 testsMiami County: 63% of tests at or above 4 pCi/L · 30 testsMonroe County: 34% of tests at or above 4 pCi/L · 2,375 testsMontgomery County: 41% of tests at or above 4 pCi/L · 152 testsMorgan County: 44% of tests at or above 4 pCi/L · 226 testsNewton County: 13% of tests at or above 4 pCi/L · 16 testsNoble County: 53% of tests at or above 4 pCi/L · 136 testsOhio County: 52% of tests at or above 4 pCi/L · 21 testsOrange County: 43% of tests at or above 4 pCi/L · 23 testsOwen County: 39% of tests at or above 4 pCi/L · 110 testsParke County: 68% of tests at or above 4 pCi/L · 25 testsPerry County: 23% of tests at or above 4 pCi/L · 26 testsPike County: 50% of tests at or above 4 pCi/L · 6 testsPorter County: 46% of tests at or above 4 pCi/L · 1,136 testsPosey County: 35% of tests at or above 4 pCi/L · 215 testsPulaski County: 32% of tests at or above 4 pCi/L · 22 testsPutnam County: 34% of tests at or above 4 pCi/L · 119 testsRandolph County: 61% of tests at or above 4 pCi/L · 28 testsRipley County: 35% of tests at or above 4 pCi/L · 68 testsRush County: 47% of tests at or above 4 pCi/L · 17 testsSt. Joseph County: 29% of tests at or above 4 pCi/L · 7,346 testsScott County: 35% of tests at or above 4 pCi/L · 17 testsShelby County: 50% of tests at or above 4 pCi/L · 84 testsSpencer County: 60% of tests at or above 4 pCi/L · 25 testsStarke County: 4% of tests at or above 4 pCi/L · 24 testsSteuben County: 56% of tests at or above 4 pCi/L · 140 testsSullivan County: 46% of tests at or above 4 pCi/L · 13 testsSwitzerland County: 33% of tests at or above 4 pCi/L · 15 testsTippecanoe County: 37% of tests at or above 4 pCi/L · 1,218 testsTipton County: 49% of tests at or above 4 pCi/L · 69 testsUnion County: 50% of tests at or above 4 pCi/L · 8 testsVanderburgh County: 24% of tests at or above 4 pCi/L · 1,505 testsVermillion County: 42% of tests at or above 4 pCi/L · 24 testsVigo County: 44% of tests at or above 4 pCi/L · 455 testsWabash County: 59% of tests at or above 4 pCi/L · 91 testsWarren County: 33% of tests at or above 4 pCi/L · 27 testsWarrick County: 21% of tests at or above 4 pCi/L · 561 testsWashington County: 42% of tests at or above 4 pCi/L · 38 testsWayne County: 56% of tests at or above 4 pCi/L · 140 testsWells County: 48% of tests at or above 4 pCi/L · 161 testsWhite County: 36% of tests at or above 4 pCi/L · 42 testsWhitley County: 52% of tests at or above 4 pCi/L · 184 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
Adams County6648%3.8Zone 1Radon test results from laboratories through 2017
Allen County3,99042%3.3Zone 1Radon test results from laboratories through 2017
Bartholomew County1,70749%3.9Zone 1Radon test results from laboratories through 2017
Benton County3462%5.7Zone 1Radon test results from laboratories through 2017
Blackford County1136%3.6Zone 1Radon test results from laboratories through 2017
Boone County61440%3.0Zone 1Radon test results from laboratories through 2017
Brown County11226%2.8Zone 2Radon test results from laboratories through 2017
Carroll County3861%5.8Zone 1Radon test results from laboratories through 2017
Cass County9134%2.6Zone 1Radon test results from laboratories through 2017
Clark County51248%3.6Zone 1Radon test results from laboratories through 2017
Clay County2326%2.9Zone 2Radon test results from laboratories through 2017
Clinton County8546%3.5Zone 1Radon test results from laboratories through 2017
Crawford County1030%2.7Zone 2Radon test results from laboratories through 2017
Daviess County5834%3.1Zone 2Radon test results from laboratories through 2017
DeKalb County24257%4.4Zone 1Radon test results from laboratories through 2017
Dearborn County13630%2.6Zone 2Radon test results from laboratories through 2017
Decatur County6333%2.8Zone 1Radon test results from laboratories through 2017
Delaware County18755%4.2Zone 1Radon test results from laboratories through 2017
Dubois County13644%3.7Zone 2Radon test results from laboratories through 2017
Elkhart County2,85646%3.7Zone 1Radon test results from laboratories through 2017
Fayette County1377%7.9Zone 1Radon test results from laboratories through 2017
Floyd County31642%3.3Zone 2Radon test results from laboratories through 2017
Fountain County6055%4.6Zone 1Radon test results from laboratories through 2017
Franklin County5028%2.1Zone 2Radon test results from laboratories through 2017
Fulton County9746%3.3Zone 1Radon test results from laboratories through 2017
Gibson County12043%3.4Zone 2Radon test results from laboratories through 2017
Grant County7958%4.6Zone 1Radon test results from laboratories through 2017
Greene County4933%3.0Zone 2Radon test results from laboratories through 2017
Hamilton County3,47938%2.7Zone 1Radon test results from laboratories through 2017
Hancock County27134%2.6Zone 1Radon test results from laboratories through 2017
Harrison County22162%5.5Zone 1Radon test results from laboratories through 2017
Hendricks County1,17042%3.2Zone 1Radon test results from laboratories through 2017
Henry County9551%4.0Zone 1Radon test results from laboratories through 2017
Howard County21649%3.8Zone 1Radon test results from laboratories through 2017
Huntington County16944%3.5Zone 1Radon test results from laboratories through 2017
Jackson County8827%2.8Zone 2Radon test results from laboratories through 2017
Jasper County7114%1.2Zone 2Radon test results from laboratories through 2017
Jay County944%2.7Zone 1Radon test results from laboratories through 2017
Jefferson County7246%3.1Zone 2Radon test results from laboratories through 2017
Jennings County5735%2.8Zone 1Radon test results from laboratories through 2017
Johnson County55639%2.9Zone 1Radon test results from laboratories through 2017
Knox County5843%3.4Zone 2Radon test results from laboratories through 2017
Kosciusko County1,24851%4.0Zone 1Radon test results from laboratories through 2017
LaGrange County12042%3.4Zone 1Radon test results from laboratories through 2017
LaPorte County79258%5.0Zone 2Radon test results from laboratories through 2017
Lake County1,19823%1.8Zone 2Radon test results from laboratories through 2017
Lawrence County26736%2.7Zone 1Radon test results from laboratories through 2017
Madison County23949%3.8Zone 1Radon test results from laboratories through 2017
Marion County3,66840%3.1Zone 1Radon test results from laboratories through 2017
Marshall County38340%3.2Zone 1Radon test results from laboratories through 2017
Martin County838%3.7Zone 2Radon test results from laboratories through 2017
Miami County3063%5.3Zone 1Radon test results from laboratories through 2017
Monroe County2,37534%2.8Zone 1Radon test results from laboratories through 2017
Montgomery County15241%2.9Zone 1Radon test results from laboratories through 2017
Morgan County22644%3.5Zone 2Radon test results from laboratories through 2017
Newton County1613%1.6Zone 2Radon test results from laboratories through 2017
Noble County13653%4.3Zone 1Radon test results from laboratories through 2017
Ohio County2152%4.1Zone 2Radon test results from laboratories through 2017
Orange County2343%2.9Zone 1Radon test results from laboratories through 2017
Owen County11039%2.8Zone 2Radon test results from laboratories through 2017
Parke County2568%4.8Zone 2Radon test results from laboratories through 2017
Perry County2623%2.3Zone 2Radon test results from laboratories through 2017
Pike County650%3.6Zone 2Radon test results from laboratories through 2017
Porter County1,13646%3.5Zone 2Radon test results from laboratories through 2017
Posey County21535%2.8Zone 2Radon test results from laboratories through 2017
Pulaski County2232%2.3Zone 2Radon test results from laboratories through 2017
Putnam County11934%2.7Zone 1Radon test results from laboratories through 2017
Randolph County2861%4.5Zone 1Radon test results from laboratories through 2017
Ripley County6835%2.9Zone 2Radon test results from laboratories through 2017
Rush County1747%3.9Zone 1Radon test results from laboratories through 2017
Scott County1735%2.0Zone 1Radon test results from laboratories through 2017
Shelby County8450%4.0Zone 1Radon test results from laboratories through 2017
Spencer County2560%4.5Zone 2Radon test results from laboratories through 2017
St. Joseph County7,34629%2.7Zone 1Radon test results from laboratories through 2017
Starke County244%1.6Zone 2Radon test results from laboratories through 2017
Steuben County14056%4.5Zone 1Radon test results from laboratories through 2017
Sullivan County1346%3.1Zone 2Radon test results from laboratories through 2017
Switzerland County1533%1.5Zone 2Radon test results from laboratories through 2017
Tippecanoe County1,21837%2.7Zone 1Radon test results from laboratories through 2017
Tipton County6949%3.9Zone 1Radon test results from laboratories through 2017
Union County850%3.8Zone 1Radon test results from laboratories through 2017
Vanderburgh County1,50524%2.4Zone 2Radon test results from laboratories through 2017
Vermillion County2442%3.3Zone 1Radon test results from laboratories through 2017
Vigo County45544%3.6Zone 2Radon test results from laboratories through 2017
Wabash County9159%5.8Zone 1Radon test results from laboratories through 2017
Warren County2733%3.5Zone 1Radon test results from laboratories through 2017
Warrick County56121%1.8Zone 2Radon test results from laboratories through 2017
Washington County3842%3.5Zone 1Radon test results from laboratories through 2017
Wayne County14056%4.5Zone 1Radon test results from laboratories through 2017
Wells County16148%3.6Zone 1Radon test results from laboratories through 2017
White County4236%2.7Zone 1Radon test results from laboratories through 2017
Whitley County18452%4.0Zone 1Radon test results from laboratories through 2017

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