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 132 cities.
Updated August 30, 2026
Highest city
10.9pCi/L
Peru
Indiana city average
3.6pCi/L
across 132 cities
Above action level
37/ 132
cities
| # | Location | Avg level | vs action level |
|---|---|---|---|
| 1 | Peru | 10.9 pCi/L | 2.7× over |
| 2 | Rushville | 10.9 pCi/L | 2.7× over |
| 3 | Yorktown | 10.7 pCi/L | 2.7× over |
| 4 | Battle Ground | 10.2 pCi/L | 2.5× over |
| 5 | Boonville | 8.9 pCi/L | 2.2× over |
| 6 | LaPorte | 8.1 pCi/L | 2.0× over |
| 7 | Greenfield | 7.3 pCi/L | 1.8× over |
| 8 | Syracuse | 6.9 pCi/L | 1.7× over |
| 9 | Oolitic | 6.5 pCi/L | 1.6× over |
| 10 | North Webster | 6.3 pCi/L | 1.6× over |
| 11 | Corydon | 6.2 pCi/L | 1.5× over |
| 12 | Charlestown | 6.1 pCi/L | 1.5× over |
| 13 | Seelyville | 5.9 pCi/L | 1.5× over |
| 14 | Southport | 5.8 pCi/L | 1.5× over |
| 15 | Fairfield Heights | 5.7 pCi/L | 1.4× over |
| 16 | Muncie | 5.5 pCi/L | 1.4× over |
| 17 | Middletown | 5.4 pCi/L | 1.4× over |
| 18 | Dayton | 5.1 pCi/L | 1.3× over |
| 19 | Rome City | 5.1 pCi/L | 1.3× over |
| 20 | Vincennes | 5.0 pCi/L | 1.3× over |
| 21 | Wanatah | 5.0 pCi/L | 1.2× over |
| 22 | Kouts | 4.6 pCi/L | 1.2× over |
| 23 | Plainfield | 4.6 pCi/L | 1.2× over |
| 24 | Wabash | 4.6 pCi/L | 1.1× over |
| 25 | Shorewood Forest | 4.6 pCi/L | 1.1× over |
| 26 | Dunlap | 4.5 pCi/L | 1.1× over |
| 27 | Henryville | 4.5 pCi/L | 1.1× over |
| 28 | Lafayette | 4.4 pCi/L | 1.1× over |
| 29 | Jasper | 4.3 pCi/L | 1.1× over |
| 30 | Warren Park | 4.3 pCi/L | 1.1× over |
| 31 | Pittsboro | 4.2 pCi/L | 1.1× over |
| 32 | Whiteland | 4.2 pCi/L | 1.0× over |
| 33 | Crawfordsville | 4.1 pCi/L | 1.0× over |
| 34 | Ossian | 4.1 pCi/L | 1.0× over |
| 35 | Bargersville | 4.1 pCi/L | 1.0× over |
| 36 | Auburn | 4.1 pCi/L | 1.0× over |
| 37 | Huntington | 4.0 pCi/L | 1.0× over |
| ✓ Below EPA action level (4 pCi/L) | |||
| 38 | Valparaiso | 4.0 pCi/L | 1.0× under |
| 39 | Terre Haute | 4.0 pCi/L | 1.0× under |
| 40 | Marion | 3.9 pCi/L | 1.0× under |
| 41 | Churubusco | 3.9 pCi/L | 1.0× under |
| 42 | Greensburg | 3.9 pCi/L | 1.0× under |
| 43 | Roanoke | 3.8 pCi/L | 1.0× under |
| 44 | Waterloo | 3.8 pCi/L | 1.0× under |
| 45 | Franklin | 3.8 pCi/L | 0.9× under |
| 46 | Warsaw | 3.8 pCi/L | 0.9× under |
| 47 | Pendleton | 3.7 pCi/L | 0.9× under |
| 48 | Noblesville | 3.7 pCi/L | 0.9× under |
| 49 | Goshen | 3.7 pCi/L | 0.9× under |
| 50 | Indianapolis | 3.7 pCi/L | 0.9× under |
| 51 | Speedway | 3.7 pCi/L | 0.9× under |
| 52 | Kokomo | 3.7 pCi/L | 0.9× under |
| 53 | Decatur | 3.6 pCi/L | 0.9× under |
| 54 | Broad Ripple | 3.5 pCi/L | 0.9× under |
| 55 | Aberdeen | 3.5 pCi/L | 0.9× under |
| 56 | Lebanon | 3.5 pCi/L | 0.9× under |
| 57 | North Liberty | 3.4 pCi/L | 0.9× under |
| 58 | Anderson | 3.4 pCi/L | 0.8× under |
| 59 | Frankfort | 3.4 pCi/L | 0.8× under |
| 60 | Fort Wayne | 3.4 pCi/L | 0.8× under |
| 61 | Fishers | 3.3 pCi/L | 0.8× under |
| 62 | Saint John | 3.3 pCi/L | 0.8× under |
| 63 | Dyer | 3.3 pCi/L | 0.8× under |
| 64 | Fortville | 3.3 pCi/L | 0.8× under |
| 65 | Carmel | 3.3 pCi/L | 0.8× under |
| 66 | Cumberland | 3.3 pCi/L | 0.8× under |
| 67 | West Lafayette | 3.2 pCi/L | 0.8× under |
| 68 | New Haven | 3.2 pCi/L | 0.8× under |
| 69 | Beech Grove | 3.2 pCi/L | 0.8× under |
| 70 | Evansville | 3.2 pCi/L | 0.8× under |
| 71 | Bloomington | 3.1 pCi/L | 0.8× under |
| 72 | Indian Heights | 3.1 pCi/L | 0.8× under |
| 73 | Clarksville | 3.1 pCi/L | 0.8× under |
| 74 | Leo-Cedarville | 3.0 pCi/L | 0.8× under |
| 75 | Brazil | 3.0 pCi/L | 0.7× under |
| 76 | McCordsville | 2.9 pCi/L | 0.7× under |
| 77 | Columbus | 2.9 pCi/L | 0.7× under |
| 78 | Greenwood | 2.9 pCi/L | 0.7× under |
| 79 | Lakes of the Four Seasons | 2.9 pCi/L | 0.7× under |
| 80 | Galena | 2.8 pCi/L | 0.7× under |
| 81 | Meridian Hills | 2.8 pCi/L | 0.7× under |
| 82 | Elkhart | 2.8 pCi/L | 0.7× under |
| 83 | Martinsville | 2.8 pCi/L | 0.7× under |
| 84 | Richmond | 2.8 pCi/L | 0.7× under |
| 85 | Winona Lake | 2.8 pCi/L | 0.7× under |
| 86 | Zionsville | 2.7 pCi/L | 0.7× under |
| 87 | Lawrence | 2.7 pCi/L | 0.7× under |
| 88 | Gulivoire Park | 2.7 pCi/L | 0.7× under |
| 89 | Sellersburg | 2.6 pCi/L | 0.6× under |
| 90 | Huntertown | 2.5 pCi/L | 0.6× under |
| 91 | Granger | 2.5 pCi/L | 0.6× under |
| 92 | Brownsburg | 2.5 pCi/L | 0.6× under |
| 93 | Bluffton | 2.5 pCi/L | 0.6× under |
| 94 | New Palestine | 2.5 pCi/L | 0.6× under |
| 95 | Clermont | 2.5 pCi/L | 0.6× under |
| 96 | Portage | 2.4 pCi/L | 0.6× under |
| 97 | Cedar Lake | 2.4 pCi/L | 0.6× under |
| 98 | Milford | 2.4 pCi/L | 0.6× under |
| 99 | Westfield | 2.4 pCi/L | 0.6× under |
| 100 | Newburgh | 2.3 pCi/L | 0.6× under |
| 101 | Schererville | 2.3 pCi/L | 0.6× under |
| 102 | Oak Park | 2.3 pCi/L | 0.6× under |
| 103 | Whitestown | 2.3 pCi/L | 0.6× under |
| 104 | Ellettsville | 2.3 pCi/L | 0.6× under |
| 105 | Melody Hill | 2.2 pCi/L | 0.6× under |
| 106 | Jeffersonville | 2.2 pCi/L | 0.6× under |
| 107 | Chandler | 2.2 pCi/L | 0.6× under |
| 108 | Aurora | 2.2 pCi/L | 0.5× under |
| 109 | Avon | 2.1 pCi/L | 0.5× under |
| 110 | Crown Point | 2.1 pCi/L | 0.5× under |
| 111 | Georgetown | 2.1 pCi/L | 0.5× under |
| 112 | Mishawaka | 2.1 pCi/L | 0.5× under |
| 113 | Greendale | 2.1 pCi/L | 0.5× under |
| 114 | Osceola | 2.0 pCi/L | 0.5× under |
| 115 | Westville | 2.0 pCi/L | 0.5× under |
| 116 | Kendallville | 2.0 pCi/L | 0.5× under |
| 117 | Bright | 2.0 pCi/L | 0.5× under |
| 118 | Highland | 1.9 pCi/L | 0.5× under |
| 119 | Bloomfield | 1.9 pCi/L | 0.5× under |
| 120 | Cicero | 1.8 pCi/L | 0.5× under |
| 121 | Lowell | 1.8 pCi/L | 0.4× under |
| 122 | Griffith | 1.6 pCi/L | 0.4× under |
| 123 | South Bend | 1.6 pCi/L | 0.4× under |
| 124 | New Albany | 1.6 pCi/L | 0.4× under |
| 125 | Bristol | 1.6 pCi/L | 0.4× under |
| 126 | Munster | 1.6 pCi/L | 0.4× under |
| 127 | Chesterton | 1.4 pCi/L | 0.3× under |
| 128 | South Haven | 1.3 pCi/L | 0.3× under |
| 129 | Columbia City | 1.2 pCi/L | 0.3× under |
| 130 | Batesville | 1.2 pCi/L | 0.3× under |
| 131 | Roselawn | 0.6 pCi/L | 0.2× under |
| 132 | Michigan City | 0.4 pCi/L | 0.1× under |