Missouri Cities Ranked by Indoor Radon Levels
Measured averages from Airthings devices across Missouri, USA. Action level: 4 pCi/L — the threshold at which remediation is recommended.
Winfield has the highest measured indoor radon in Missouri at 9.1 pCi/L, based on Airthings measurements across 112 cities.
Updated August 16, 2026
Highest city
9.1pCi/L
Winfield
Missouri city average
3.1pCi/L
across 112 cities
Above action level
21/ 112
cities
| # | Location | Avg level | Monitors | vs action level |
|---|---|---|---|---|
| 1 | Winfield | 9.1 pCi/L | 7 | 2.3× over |
| 2 | Harrisonville | 7.2 pCi/L | 8 | 1.8× over |
| 3 | Platte City | 6.9 pCi/L | 10 | 1.7× over |
| 4 | Odessa | 6.7 pCi/L | 12 | 1.7× over |
| 5 | Festus | 6.0 pCi/L | 8 | 1.5× over |
| 6 | Lake Lotawana | 5.9 pCi/L | 16 | 1.5× over |
| 7 | Fenton | 5.6 pCi/L | 11 | 1.4× over |
| 8 | Country Club Village | 5.2 pCi/L | 7 | 1.3× over |
| 9 | Imperial | 5.0 pCi/L | 11 | 1.2× over |
| 10 | Eureka | 4.9 pCi/L | 16 | 1.2× over |
| 11 | Rolla | 4.9 pCi/L | 6 | 1.2× over |
| 12 | Sappington | 4.8 pCi/L | 10 | 1.2× over |
| 13 | Troy | 4.6 pCi/L | 14 | 1.1× over |
| 14 | Independence | 4.6 pCi/L | 23 | 1.1× over |
| 15 | Pleasant Hill | 4.5 pCi/L | 8 | 1.1× over |
| 16 | Camdenton | 4.5 pCi/L | 9 | 1.1× over |
| 17 | Weston | 4.5 pCi/L | 9 | 1.1× over |
| 18 | Blue Springs | 4.3 pCi/L | 36 | 1.1× over |
| 19 | Gladstone | 4.2 pCi/L | 50 | 1.1× over |
| 20 | Saint Paul | 4.1 pCi/L | 15 | 1.0× over |
| 21 | Saint Joseph | 4.1 pCi/L | 9 | 1.0× over |
| ✓ Below EPA action level (4 pCi/L) | ||||
| 22 | Belton | 3.9 pCi/L | 29 | 1.0× under |
| 23 | Raymore | 3.9 pCi/L | 14 | 1.0× under |
| 24 | Black Jack | 3.9 pCi/L | 7 | 1.0× under |
| 25 | Grain Valley | 3.9 pCi/L | 13 | 1.0× under |
| 26 | Raytown | 3.8 pCi/L | 15 | 1.0× under |
| 27 | Wentzville | 3.8 pCi/L | 46 | 1.0× under |
| 28 | North Kansas City | 3.8 pCi/L | 20 | 0.9× under |
| 29 | Pacific | 3.8 pCi/L | 9 | 0.9× under |
| 30 | Saint Peters | 3.7 pCi/L | 46 | 0.9× under |
| 31 | Grandview | 3.5 pCi/L | 27 | 0.9× under |
| 32 | Byrnes Mill | 3.5 pCi/L | 6 | 0.9× under |
| 33 | East Independence | 3.4 pCi/L | 12 | 0.9× under |
| 34 | Peculiar | 3.4 pCi/L | 7 | 0.9× under |
| 35 | Weatherby Lake | 3.4 pCi/L | 21 | 0.9× under |
| 36 | Lake Saint Louis | 3.4 pCi/L | 54 | 0.8× under |
| 37 | Manchester | 3.4 pCi/L | 18 | 0.8× under |
| 38 | Springfield | 3.4 pCi/L | 63 | 0.8× under |
| 39 | Columbia | 3.4 pCi/L | 50 | 0.8× under |
| 40 | Lees Summit | 3.4 pCi/L | 69 | 0.8× under |
| 41 | O'Fallon | 3.4 pCi/L | 29 | 0.8× under |
| 42 | Arnold | 3.3 pCi/L | 20 | 0.8× under |
| 43 | Kirksville | 3.3 pCi/L | 7 | 0.8× under |
| 44 | Perryville | 3.3 pCi/L | 7 | 0.8× under |
| 45 | Riverside | 3.2 pCi/L | 31 | 0.8× under |
| 46 | Kearney | 3.1 pCi/L | 8 | 0.8× under |
| 47 | Oakville | 3.1 pCi/L | 16 | 0.8× under |
| 48 | Ballwin | 3.0 pCi/L | 38 | 0.8× under |
| 49 | Pleasant Valley | 3.0 pCi/L | 13 | 0.8× under |
| 50 | Warrenton | 3.0 pCi/L | 11 | 0.8× under |
| 51 | Hazelwood | 3.0 pCi/L | 6 | 0.7× under |
| 52 | Chesterfield | 2.9 pCi/L | 78 | 0.7× under |
| 53 | Town and Country | 2.9 pCi/L | 32 | 0.7× under |
| 54 | Kimberling City | 2.9 pCi/L | 11 | 0.7× under |
| 55 | Richmond Heights | 2.9 pCi/L | 21 | 0.7× under |
| 56 | Union | 2.9 pCi/L | 10 | 0.7× under |
| 57 | Wardsville | 2.9 pCi/L | 7 | 0.7× under |
| 58 | Parkville | 2.9 pCi/L | 30 | 0.7× under |
| 59 | Ozark | 2.8 pCi/L | 21 | 0.7× under |
| 60 | Oronogo | 2.8 pCi/L | 7 | 0.7× under |
| 61 | De Soto | 2.8 pCi/L | 8 | 0.7× under |
| 62 | Crystal City | 2.8 pCi/L | 6 | 0.7× under |
| 63 | Wildwood | 2.7 pCi/L | 39 | 0.7× under |
| 64 | Winchester | 2.7 pCi/L | 24 | 0.7× under |
| 65 | Cottleville | 2.7 pCi/L | 30 | 0.7× under |
| 66 | Shell Knob | 2.6 pCi/L | 6 | 0.7× under |
| 67 | St. Louis | 2.6 pCi/L | 82 | 0.7× under |
| 68 | Willard | 2.6 pCi/L | 7 | 0.7× under |
| 69 | Barnhart | 2.6 pCi/L | 6 | 0.6× under |
| 70 | Concord | 2.5 pCi/L | 12 | 0.6× under |
| 71 | Murphy | 2.5 pCi/L | 20 | 0.6× under |
| 72 | Ellisville | 2.5 pCi/L | 24 | 0.6× under |
| 73 | Strafford | 2.5 pCi/L | 10 | 0.6× under |
| 74 | Liberty | 2.4 pCi/L | 20 | 0.6× under |
| 75 | Maryland Heights | 2.4 pCi/L | 26 | 0.6× under |
| 76 | Saint Charles | 2.4 pCi/L | 92 | 0.6× under |
| 77 | Sunset Hills | 2.4 pCi/L | 8 | 0.6× under |
| 78 | Lake Winnebago | 2.3 pCi/L | 30 | 0.6× under |
| 79 | Crestwood | 2.3 pCi/L | 16 | 0.6× under |
| 80 | Des Peres | 2.2 pCi/L | 31 | 0.6× under |
| 81 | Kansas City | 2.1 pCi/L | 33 | 0.5× under |
| 82 | Ashland | 2.1 pCi/L | 11 | 0.5× under |
| 83 | Weldon Spring | 2.1 pCi/L | 22 | 0.5× under |
| 84 | Maplewood | 2.1 pCi/L | 28 | 0.5× under |
| 85 | Warrensburg | 2.1 pCi/L | 14 | 0.5× under |
| 86 | Clayton | 2.1 pCi/L | 19 | 0.5× under |
| 87 | Hollister | 2.0 pCi/L | 8 | 0.5× under |
| 88 | Ladue | 2.0 pCi/L | 13 | 0.5× under |
| 89 | Frontenac | 2.0 pCi/L | 6 | 0.5× under |
| 90 | Cape Girardeau | 2.0 pCi/L | 12 | 0.5× under |
| 91 | Creve Coeur | 2.0 pCi/L | 41 | 0.5× under |
| 92 | Jefferson City | 2.0 pCi/L | 9 | 0.5× under |
| 93 | High Ridge | 1.9 pCi/L | 10 | 0.5× under |
| 94 | Affton | 1.9 pCi/L | 6 | 0.5× under |
| 95 | Clarkson Valley | 1.9 pCi/L | 27 | 0.5× under |
| 96 | Olivette | 1.9 pCi/L | 15 | 0.5× under |
| 97 | Valley Park | 1.8 pCi/L | 10 | 0.5× under |
| 98 | Nixa | 1.8 pCi/L | 26 | 0.5× under |
| 99 | Florissant | 1.8 pCi/L | 12 | 0.4× under |
| 100 | Clever | 1.8 pCi/L | 6 | 0.4× under |
| 101 | Kirkwood | 1.8 pCi/L | 13 | 0.4× under |
| 102 | Rogersville | 1.8 pCi/L | 9 | 0.4× under |
| 103 | Battlefield | 1.7 pCi/L | 12 | 0.4× under |
| 104 | Webster Groves | 1.7 pCi/L | 13 | 0.4× under |
| 105 | Dardenne Prairie | 1.7 pCi/L | 53 | 0.4× under |
| 106 | Brentwood | 1.6 pCi/L | 22 | 0.4× under |
| 107 | Hillsdale | 1.6 pCi/L | 17 | 0.4× under |
| 108 | Lemay | 1.6 pCi/L | 16 | 0.4× under |
| 109 | Smithville | 1.5 pCi/L | 6 | 0.4× under |
| 110 | Joplin | 1.3 pCi/L | 7 | 0.3× under |
| 111 | Jackson | 1.2 pCi/L | 7 | 0.3× under |
| 112 | Merriam Woods | 0.9 pCi/L | 6 | 0.2× under |