Wyoming Cities Ranked by Indoor Radon Levels
Measured averages from Airthings devices across Wyoming, USA. Action level: 4 pCi/L — the threshold at which remediation is recommended.
Torrington has the highest measured indoor radon in Wyoming at 9.3 pCi/L, based on Airthings measurements across 27 cities.
Updated October 19, 2026
Highest city
9.3pCi/L
Torrington
Wyoming city average
4.3pCi/L
across 27 cities
Above action level
13/ 27
cities
| # | Location | Avg level | vs action level |
|---|---|---|---|
| 1 | Torrington | 9.3 pCi/L | 2.3× over |
| 2 | Afton | 9.0 pCi/L | 2.3× over |
| 3 | Rafter J Ranch | 7.8 pCi/L | 2.0× over |
| 4 | Buffalo | 5.9 pCi/L | 1.5× over |
| 5 | Riverton | 5.5 pCi/L | 1.4× over |
| 6 | Sheridan | 5.4 pCi/L | 1.3× over |
| 7 | Jackson | 5.3 pCi/L | 1.3× over |
| 8 | Cody | 5.3 pCi/L | 1.3× over |
| 9 | Mills | 5.0 pCi/L | 1.3× over |
| 10 | Lander | 5.0 pCi/L | 1.2× over |
| 11 | Pinedale | 4.5 pCi/L | 1.1× over |
| 12 | Douglas | 4.4 pCi/L | 1.1× over |
| 13 | Green River | 4.2 pCi/L | 1.0× over |
| ✓ Below EPA action level (4 pCi/L) | |||
| 14 | Evansville | 3.8 pCi/L | 0.9× under |
| 15 | Casper | 3.5 pCi/L | 0.9× under |
| 16 | Laramie | 3.5 pCi/L | 0.9× under |
| 17 | Gillette | 3.3 pCi/L | 0.8× under |
| 18 | Rawlins | 3.2 pCi/L | 0.8× under |
| 19 | Fox Farm-College | 3.0 pCi/L | 0.8× under |
| 20 | Wilson | 2.8 pCi/L | 0.7× under |
| 21 | Rock Springs | 2.6 pCi/L | 0.7× under |
| 22 | South Park | 2.6 pCi/L | 0.6× under |
| 23 | Wheatland | 2.4 pCi/L | 0.6× under |
| 24 | Ranchettes | 2.3 pCi/L | 0.6× under |
| 25 | Cheyenne | 2.2 pCi/L | 0.5× under |
| 26 | Moose Wilson Road | 1.9 pCi/L | 0.5× under |
| 27 | Hoback | 1.5 pCi/L | 0.4× under |