| County | Towns | Locations tested | Elevated results | Share elevated |
|---|---|---|---|---|
| Addison County | 23 | 1,961 | 309 | 16% |
| Bennington County | 17 | 967 | 181 | 19% |
| Caledonia County | 17 | 1,210 | 293 | 24% |
| Chittenden County | 19 | 8,191 | 839 | 10% |
| Essex County | 19 | 161 | 33 | 20% |
| Franklin County | 15 | 1,434 | 129 | 9% |
| Grand Isle County | 5 | 471 | 99 | 21% |
| Lamoille County | 10 | 1,088 | 162 | 15% |
| Orange County | 17 | 1,132 | 277 | 24% |
| Orleans County | 19 | 1,002 | 145 | 14% |
| Rutland County | 28 | 2,074 | 326 | 16% |
| Washington County | 20 | 3,814 | 786 | 21% |
| Windham County | 23 | 1,559 | 205 | 13% |
| Windsor County | 24 | 1,741 | 285 | 16% |
| Vermont | 256 | 26,805 | 4,069 | 15% |
Each county total adds up its towns’ Health Department results, including towns with fewer than 20 results; these totals are Vermont Radon’s calculation, not Health Department figures.1 Elevated means a result at or above 4.0 pCi/L.
Important: county numbers can’t tell you your home’s level. Neighboring homes can have very different radon levels,2 and the EPA advises against using results from other homes to estimate yours.3 The only way to know is to test your home.
Last reviewed How we source facts
Sources
3 official sources
- Vermont Department of Health. Radon Risk in Vermont: test results by town (map data service). Checked 2026-10-17. ↩
- Vermont Department of Health. Radon in Your Home. Checked 2026-10-17. ↩
- U.S. Environmental Protection Agency. Home Buyer’s and Seller’s Guide to Radon (EPA 402/K-24/001, March 2024). Checked 2026-10-17. ↩