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Counties with the Highest Radon Potential in New York

The top 25 of 62 New York 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
1Bronx County
3
2Essex County
3
3Franklin County
3
4Fulton County
3
5Hamilton County
3
6Herkimer County
3
7Kings County
3
8Nassau County
3
9New York County
3
10Queens County
3
11Richmond County
3
12Rockland County
3
13Suffolk County
3
14Warren County
3
15Westchester County
3
16Clinton County
2
17Jefferson County
2
18Lewis County
2
19Monroe County
2
20Montgomery County
2
21Niagara County
2
22Oneida County
2
23Orleans County
2
24Oswego County
2
25Saratoga 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 New York”, https://gismap.land/rankings/new-york/highest-radon-counties. Figures from EPA Map of Radon Zones (September 2025).

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