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Counties with the Highest Radon Potential in Vermont

The top 14 of 14 Vermont counties on GIS Map, ranked by EPA radon zone, where zone 1 carries the highest predicted indoor radon potential and zone 3 the lowest.

#CountyEPA radon zone
1Chittenden County
3
2Grand Isle County
3
3Addison County
2
4Bennington County
2
5Caledonia County
2
6Essex County
2
7Franklin County
2
8Lamoille County
2
9Orange County
2
10Orleans County
2
11Rutland County
2
12Washington County
2
13Windham County
2
14Windsor County
2

Source: EPA Map of Radon Zones (September 2025). All counties with data are ranked. Estimates carry margins of error.

Citing this page: GIS Map, “Counties with the Highest Radon Potential in Vermont”, https://gismap.land/rankings/vermont/highest-radon-counties. Figures from EPA Map of Radon Zones (September 2025).

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