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Counties with the Highest Radon Potential in Louisiana

The top 25 of 64 Louisiana 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
1Acadia Parish
3
2Allen Parish
3
3Ascension Parish
3
4Assumption Parish
3
5Avoyelles Parish
3
6Beauregard Parish
3
7Bienville Parish
3
8Bossier Parish
3
9Caddo Parish
3
10Calcasieu Parish
3
11Caldwell Parish
3
12Cameron Parish
3
13Catahoula Parish
3
14Claiborne Parish
3
15Concordia Parish
3
16De Soto Parish
3
17East Baton Rouge Parish
3
18East Carroll Parish
3
19East Feliciana Parish
3
20Evangeline Parish
3
21Franklin Parish
3
22Grant Parish
3
23Iberia Parish
3
24Iberville Parish
3
25Jackson Parish
3

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 Louisiana”, https://gismap.land/rankings/louisiana/highest-radon-counties. Figures from EPA Map of Radon Zones (September 2025).

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