Radon Compass

Radon in Louisiana

About 1 in 34 homes tested in Louisiana were at or above the EPA action level of 4 pCi/L.

203 homes tested, 2008–2017
  • Below 2 pCi/L: 91%
  • 2 to 4 pCi/L: 6%
  • 4 pCi/L or more: 3%
The line marks the EPA action level, 4 pCi/L.

The EPA puts 0 of Louisiana's 64 counties in Zone 1, its highest radon category, 0 in Zone 2 and 64 in Zone 3.

Every county in Louisiana

Sorted by the share of homes tested at or above 4 pCi/L. Select a county for local details and costs.

CountyHomes testedAt or above 4MedianEPA zone
Franklin Parish1 tests––3
St. Landry Parish2 tests––3
Caddo Parish9 tests––3
Livingston Parish4 tests––3
Lafayette Parish12 tests––3
Bossier Parish10 tests––3
Jefferson Parish
3%0.2 pCi/L3
Acadia Parish1 tests––3
Ascension Parish11 tests––3
Calcasieu Parish
0%0.1 pCi/L3
Cameron Parish1 tests––3
De Soto Parish4 tests––3
East Baton Rouge Parish16 tests––3
Evangeline Parish2 tests––3
Iberia Parish1 tests––3
Iberville Parish1 tests––3
Lafourche Parish1 tests––3
Lincoln Parish3 tests––3
Natchitoches Parish2 tests––3
Orleans Parish
0%0.2 pCi/L3
Ouachita Parish4 tests––3
Plaquemines Parish2 tests––3
Rapides Parish3 tests––3
Red River Parish1 tests––3
Richland Parish1 tests––3
Sabine Parish1 tests––3
St. Charles Parish1 tests––3
St. John the Baptist Parish1 tests––3
St. Martin Parish1 tests––3
St. Tammany Parish10 tests––3
Tangipahoa Parish10 tests––3
Terrebonne Parish5 tests––3
Union Parish1 tests––3
Washington Parish1 tests––3
Webster Parish1 tests––3
Winn Parish1 tests––3
Allen ParishNo data––3
Assumption ParishNo data––3
Avoyelles ParishNo data––3
Beauregard ParishNo data––3
Bienville ParishNo data––3
Caldwell ParishNo data––3
Catahoula ParishNo data––3
Claiborne ParishNo data––3
Concordia ParishNo data––3
East Carroll ParishNo data––3
East Feliciana ParishNo data––3
Grant ParishNo data––3
Jackson ParishNo data––3
Jefferson Davis ParishNo data––3
LaSalle ParishNo data––3
Madison ParishNo data––3
Morehouse ParishNo data––3
Pointe Coupee ParishNo data––3
St. Bernard ParishNo data––3
St. Helena ParishNo data––3
St. James ParishNo data––3
St. Mary ParishNo data––3
Tensas ParishNo data––3
Vermilion ParishNo data––3
Vernon ParishNo data––3
West Baton Rouge ParishNo data––3
West Carroll ParishNo data––3
West Feliciana ParishNo data––3

"–" means fewer than 20 tests or no lab data, too few for a reliable figure.

Sources

Last updated October 2026. How we calculate these numbers.