Indiana Cities Ranked by Indoor Radon Levels
Measured averages from Airthings devices across Indiana, USA. Action level: 4 pCi/L — the threshold at which remediation is recommended.
Peru has the highest measured indoor radon in Indiana at 10.9 pCi/L, based on Airthings measurements across 119 cities.
Updated August 16, 2026
Highest city
10.9pCi/L
Peru
Indiana city average
3.6pCi/L
across 119 cities
Above action level
32/ 119
cities
| # | Location | Avg level | Monitors | vs action level |
|---|---|---|---|---|
| 1 | Peru | 10.9 pCi/L | 6 | 2.7× over |
| 2 | Rushville | 10.9 pCi/L | 9 | 2.7× over |
| 3 | Yorktown | 10.7 pCi/L | 6 | 2.7× over |
| 4 | Boonville | 8.9 pCi/L | 7 | 2.2× over |
| 5 | LaPorte | 8.1 pCi/L | 15 | 2.0× over |
| 6 | Greenfield | 7.3 pCi/L | 14 | 1.8× over |
| 7 | Syracuse | 6.9 pCi/L | 6 | 1.7× over |
| 8 | Oolitic | 6.5 pCi/L | 7 | 1.6× over |
| 9 | Corydon | 6.2 pCi/L | 8 | 1.5× over |
| 10 | Charlestown | 6.1 pCi/L | 11 | 1.5× over |
| 11 | Seelyville | 5.9 pCi/L | 9 | 1.5× over |
| 12 | Southport | 5.8 pCi/L | 17 | 1.5× over |
| 13 | Fairfield Heights | 5.7 pCi/L | 8 | 1.4× over |
| 14 | Muncie | 5.5 pCi/L | 8 | 1.4× over |
| 15 | Middletown | 5.4 pCi/L | 8 | 1.4× over |
| 16 | Dayton | 5.1 pCi/L | 7 | 1.3× over |
| 17 | Vincennes | 5.0 pCi/L | 7 | 1.3× over |
| 18 | Wanatah | 5.0 pCi/L | 7 | 1.2× over |
| 19 | Kouts | 4.6 pCi/L | 11 | 1.2× over |
| 20 | Plainfield | 4.6 pCi/L | 21 | 1.2× over |
| 21 | Wabash | 4.6 pCi/L | 6 | 1.1× over |
| 22 | Dunlap | 4.5 pCi/L | 7 | 1.1× over |
| 23 | Lafayette | 4.4 pCi/L | 15 | 1.1× over |
| 24 | Jasper | 4.3 pCi/L | 6 | 1.1× over |
| 25 | Warren Park | 4.3 pCi/L | 21 | 1.1× over |
| 26 | Pittsboro | 4.2 pCi/L | 17 | 1.1× over |
| 27 | Whiteland | 4.2 pCi/L | 6 | 1.0× over |
| 28 | Crawfordsville | 4.1 pCi/L | 21 | 1.0× over |
| 29 | Bargersville | 4.1 pCi/L | 11 | 1.0× over |
| 30 | Auburn | 4.1 pCi/L | 20 | 1.0× over |
| 31 | Huntington | 4.0 pCi/L | 7 | 1.0× over |
| 32 | Shorewood Forest | 4.0 pCi/L | 12 | 1.0× over |
| ✓ Below EPA action level (4 pCi/L) | ||||
| 33 | Valparaiso | 4.0 pCi/L | 36 | 1.0× under |
| 34 | Terre Haute | 4.0 pCi/L | 14 | 1.0× under |
| 35 | Marion | 3.9 pCi/L | 14 | 1.0× under |
| 36 | Churubusco | 3.9 pCi/L | 6 | 1.0× under |
| 37 | Greensburg | 3.9 pCi/L | 7 | 1.0× under |
| 38 | Roanoke | 3.8 pCi/L | 31 | 1.0× under |
| 39 | Waterloo | 3.8 pCi/L | 35 | 1.0× under |
| 40 | Franklin | 3.8 pCi/L | 6 | 0.9× under |
| 41 | Warsaw | 3.8 pCi/L | 8 | 0.9× under |
| 42 | Pendleton | 3.7 pCi/L | 14 | 0.9× under |
| 43 | Noblesville | 3.7 pCi/L | 63 | 0.9× under |
| 44 | Goshen | 3.7 pCi/L | 12 | 0.9× under |
| 45 | Indianapolis | 3.7 pCi/L | 150 | 0.9× under |
| 46 | Speedway | 3.7 pCi/L | 24 | 0.9× under |
| 47 | Kokomo | 3.7 pCi/L | 9 | 0.9× under |
| 48 | Decatur | 3.6 pCi/L | 13 | 0.9× under |
| 49 | Broad Ripple | 3.5 pCi/L | 68 | 0.9× under |
| 50 | Dyer | 3.5 pCi/L | 17 | 0.9× under |
| 51 | Aberdeen | 3.5 pCi/L | 8 | 0.9× under |
| 52 | Fort Wayne | 3.4 pCi/L | 77 | 0.9× under |
| 53 | North Liberty | 3.4 pCi/L | 7 | 0.9× under |
| 54 | Anderson | 3.4 pCi/L | 6 | 0.8× under |
| 55 | Frankfort | 3.4 pCi/L | 6 | 0.8× under |
| 56 | Fishers | 3.3 pCi/L | 79 | 0.8× under |
| 57 | Saint John | 3.3 pCi/L | 30 | 0.8× under |
| 58 | Fortville | 3.3 pCi/L | 31 | 0.8× under |
| 59 | Carmel | 3.3 pCi/L | 116 | 0.8× under |
| 60 | Cumberland | 3.3 pCi/L | 17 | 0.8× under |
| 61 | West Lafayette | 3.2 pCi/L | 61 | 0.8× under |
| 62 | New Haven | 3.2 pCi/L | 18 | 0.8× under |
| 63 | Beech Grove | 3.2 pCi/L | 24 | 0.8× under |
| 64 | Evansville | 3.2 pCi/L | 24 | 0.8× under |
| 65 | Bloomington | 3.1 pCi/L | 94 | 0.8× under |
| 66 | Clarksville | 3.1 pCi/L | 8 | 0.8× under |
| 67 | Leo-Cedarville | 3.0 pCi/L | 21 | 0.8× under |
| 68 | Brazil | 3.0 pCi/L | 8 | 0.7× under |
| 69 | McCordsville | 2.9 pCi/L | 63 | 0.7× under |
| 70 | Columbus | 2.9 pCi/L | 24 | 0.7× under |
| 71 | Greenwood | 2.9 pCi/L | 22 | 0.7× under |
| 72 | Lakes of the Four Seasons | 2.9 pCi/L | 8 | 0.7× under |
| 73 | Galena | 2.8 pCi/L | 20 | 0.7× under |
| 74 | Meridian Hills | 2.8 pCi/L | 35 | 0.7× under |
| 75 | Martinsville | 2.8 pCi/L | 24 | 0.7× under |
| 76 | Richmond | 2.8 pCi/L | 9 | 0.7× under |
| 77 | Winona Lake | 2.8 pCi/L | 9 | 0.7× under |
| 78 | Zionsville | 2.7 pCi/L | 146 | 0.7× under |
| 79 | Lawrence | 2.7 pCi/L | 14 | 0.7× under |
| 80 | Gulivoire Park | 2.7 pCi/L | 13 | 0.7× under |
| 81 | Sellersburg | 2.6 pCi/L | 20 | 0.6× under |
| 82 | Clermont | 2.5 pCi/L | 12 | 0.6× under |
| 83 | Huntertown | 2.5 pCi/L | 34 | 0.6× under |
| 84 | Granger | 2.5 pCi/L | 28 | 0.6× under |
| 85 | Brownsburg | 2.5 pCi/L | 20 | 0.6× under |
| 86 | Bluffton | 2.5 pCi/L | 7 | 0.6× under |
| 87 | New Palestine | 2.5 pCi/L | 6 | 0.6× under |
| 88 | Elkhart | 2.5 pCi/L | 15 | 0.6× under |
| 89 | Portage | 2.4 pCi/L | 13 | 0.6× under |
| 90 | Cedar Lake | 2.4 pCi/L | 12 | 0.6× under |
| 91 | Milford | 2.4 pCi/L | 8 | 0.6× under |
| 92 | Westfield | 2.3 pCi/L | 134 | 0.6× under |
| 93 | Newburgh | 2.3 pCi/L | 18 | 0.6× under |
| 94 | Schererville | 2.3 pCi/L | 16 | 0.6× under |
| 95 | Highland | 2.3 pCi/L | 13 | 0.6× under |
| 96 | Oak Park | 2.3 pCi/L | 9 | 0.6× under |
| 97 | Whitestown | 2.3 pCi/L | 14 | 0.6× under |
| 98 | Ellettsville | 2.3 pCi/L | 10 | 0.6× under |
| 99 | Melody Hill | 2.2 pCi/L | 7 | 0.6× under |
| 100 | Jeffersonville | 2.2 pCi/L | 12 | 0.6× under |
| 101 | Chandler | 2.2 pCi/L | 16 | 0.6× under |
| 102 | Aurora | 2.2 pCi/L | 6 | 0.5× under |
| 103 | Avon | 2.1 pCi/L | 17 | 0.5× under |
| 104 | Crown Point | 2.1 pCi/L | 39 | 0.5× under |
| 105 | Georgetown | 2.1 pCi/L | 33 | 0.5× under |
| 106 | Mishawaka | 2.1 pCi/L | 16 | 0.5× under |
| 107 | Greendale | 2.1 pCi/L | 6 | 0.5× under |
| 108 | Osceola | 2.0 pCi/L | 11 | 0.5× under |
| 109 | Kendallville | 2.0 pCi/L | 6 | 0.5× under |
| 110 | Bright | 2.0 pCi/L | 6 | 0.5× under |
| 111 | Lowell | 1.8 pCi/L | 10 | 0.4× under |
| 112 | Griffith | 1.6 pCi/L | 7 | 0.4× under |
| 113 | South Bend | 1.6 pCi/L | 24 | 0.4× under |
| 114 | New Albany | 1.6 pCi/L | 21 | 0.4× under |
| 115 | Bristol | 1.6 pCi/L | 8 | 0.4× under |
| 116 | Munster | 1.6 pCi/L | 10 | 0.4× under |
| 117 | Chesterton | 1.4 pCi/L | 11 | 0.3× under |
| 118 | Columbia City | 1.2 pCi/L | 6 | 0.3× under |
| 119 | Michigan City | 0.4 pCi/L | 6 | 0.1× under |