Radon Levels Guide

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Radon in Louisiana: Levels by Parish and EPA Zones

Updated November 2026 · Data: EPA Map of Radon Zones · Sources

All 64 parishes in Louisiana are in EPA Zone 3, the group with the lowest predicted indoor radon levels. Even so, the EPA recommends testing every home, because high readings are found in every zone. Find your parish below, then learn how to test your home and what to do if the result is high.

0 of 64parishes in EPA Zone 1 (highest potential)
0 of 64parishes in Zone 2 (moderate)
64 of 64parishes in Zone 3 (low)

Your county’s zone is not your home’s radon level. Homes with high radon are found in every zone. The EPA recommends testing every home, whatever its zone.

Map of EPA radon zones by county

Tangipahoa Parish: EPA radon Zone 3Acadia Parish: EPA radon Zone 3Bienville Parish: EPA radon Zone 3East Carroll Parish: EPA radon Zone 3Vermilion Parish: EPA radon Zone 3Evangeline Parish: EPA radon Zone 3Cameron Parish: EPA radon Zone 3Pointe Coupee Parish: EPA radon Zone 3St. Mary Parish: EPA radon Zone 3Red River Parish: EPA radon Zone 3St. Charles Parish: EPA radon Zone 3Iberia Parish: EPA radon Zone 3East Baton Rouge Parish: EPA radon Zone 3Grant Parish: EPA radon Zone 3De Soto Parish: EPA radon Zone 3Webster Parish: EPA radon Zone 3Calcasieu Parish: EPA radon Zone 3Lincoln Parish: EPA radon Zone 3Union Parish: EPA radon Zone 3Sabine Parish: EPA radon Zone 3Vernon Parish: EPA radon Zone 3Caldwell Parish: EPA radon Zone 3Lafayette Parish: EPA radon Zone 3St. Bernard Parish: EPA radon Zone 3East Feliciana Parish: EPA radon Zone 3West Feliciana Parish: EPA radon Zone 3St. Helena Parish: EPA radon Zone 3Richland Parish: EPA radon Zone 3La Salle Parish: EPA radon Zone 3Assumption Parish: EPA radon Zone 3Claiborne Parish: EPA radon Zone 3Concordia Parish: EPA radon Zone 3Tensas Parish: EPA radon Zone 3Jackson Parish: EPA radon Zone 3Jefferson Davis Parish: EPA radon Zone 3Jefferson Parish: EPA radon Zone 3Madison Parish: EPA radon Zone 3Bossier Parish: EPA radon Zone 3Morehouse Parish: EPA radon Zone 3Orleans Parish: EPA radon Zone 3Ouachita Parish: EPA radon Zone 3Washington Parish: EPA radon Zone 3Lafourche Parish: EPA radon Zone 3St. James Parish: EPA radon Zone 3Terrebonne Parish: EPA radon Zone 3Livingston Parish: EPA radon Zone 3Ascension Parish: EPA radon Zone 3Rapides Parish: EPA radon Zone 3Catahoula Parish: EPA radon Zone 3Natchitoches Parish: EPA radon Zone 3Franklin Parish: EPA radon Zone 3St. Landry Parish: EPA radon Zone 3St. John the Baptist Parish: EPA radon Zone 3West Baton Rouge Parish: EPA radon Zone 3Allen Parish: EPA radon Zone 3Iberville Parish: EPA radon Zone 3Beauregard Parish: EPA radon Zone 3Avoyelles Parish: EPA radon Zone 3St. Martin Parish: EPA radon Zone 3Winn Parish: EPA radon Zone 3West Carroll Parish: EPA radon Zone 3Caddo Parish: EPA radon Zone 3Plaquemines Parish: EPA radon Zone 3St. Tammany Parish: EPA radon Zone 3
Zone 1 (highest potential)Zone 2Zone 3Source: U.S. EPA Map of Radon Zones (June 2024 data file). County boundaries: U.S. Census Bureau via us-atlas.

Radon zones by parish in Louisiana

The table lists the EPA radon zone for each of the 64 parishes in Louisiana. The zone shows the predicted average indoor radon screening level for homes in that parish.

ParishEPA zonePredicted average indoor level
Acadia ParishZone 3Below 2 pCi/L
Allen ParishZone 3Below 2 pCi/L
Ascension ParishZone 3Below 2 pCi/L
Assumption ParishZone 3Below 2 pCi/L
Avoyelles ParishZone 3Below 2 pCi/L
Beauregard ParishZone 3Below 2 pCi/L
Bienville ParishZone 3Below 2 pCi/L
Bossier ParishZone 3Below 2 pCi/L
Caddo ParishZone 3Below 2 pCi/L
Calcasieu ParishZone 3Below 2 pCi/L
Caldwell ParishZone 3Below 2 pCi/L
Cameron ParishZone 3Below 2 pCi/L
Catahoula ParishZone 3Below 2 pCi/L
Claiborne ParishZone 3Below 2 pCi/L
Concordia ParishZone 3Below 2 pCi/L
De Soto ParishZone 3Below 2 pCi/L
East Baton Rouge ParishZone 3Below 2 pCi/L
East Carroll ParishZone 3Below 2 pCi/L
East Feliciana ParishZone 3Below 2 pCi/L
Evangeline ParishZone 3Below 2 pCi/L
Franklin ParishZone 3Below 2 pCi/L
Grant ParishZone 3Below 2 pCi/L
Iberia ParishZone 3Below 2 pCi/L
Iberville ParishZone 3Below 2 pCi/L
Jackson ParishZone 3Below 2 pCi/L
Jefferson ParishZone 3Below 2 pCi/L
Jefferson Davis ParishZone 3Below 2 pCi/L
Lafayette ParishZone 3Below 2 pCi/L
Lafourche ParishZone 3Below 2 pCi/L
La Salle ParishZone 3Below 2 pCi/L
Lincoln ParishZone 3Below 2 pCi/L
Livingston ParishZone 3Below 2 pCi/L
Madison ParishZone 3Below 2 pCi/L
Morehouse ParishZone 3Below 2 pCi/L
Natchitoches ParishZone 3Below 2 pCi/L
Orleans ParishZone 3Below 2 pCi/L
Ouachita ParishZone 3Below 2 pCi/L
Plaquemines ParishZone 3Below 2 pCi/L
Pointe Coupee ParishZone 3Below 2 pCi/L
Rapides ParishZone 3Below 2 pCi/L
Red River ParishZone 3Below 2 pCi/L
Richland ParishZone 3Below 2 pCi/L
Sabine ParishZone 3Below 2 pCi/L
St. Bernard ParishZone 3Below 2 pCi/L
St. Charles ParishZone 3Below 2 pCi/L
St. Helena ParishZone 3Below 2 pCi/L
St. James ParishZone 3Below 2 pCi/L
St. John the Baptist ParishZone 3Below 2 pCi/L
St. Landry ParishZone 3Below 2 pCi/L
St. Martin ParishZone 3Below 2 pCi/L
St. Mary ParishZone 3Below 2 pCi/L
St. Tammany ParishZone 3Below 2 pCi/L
Tangipahoa ParishZone 3Below 2 pCi/L
Tensas ParishZone 3Below 2 pCi/L
Terrebonne ParishZone 3Below 2 pCi/L
Union ParishZone 3Below 2 pCi/L
Vermilion ParishZone 3Below 2 pCi/L
Vernon ParishZone 3Below 2 pCi/L
Washington ParishZone 3Below 2 pCi/L
Webster ParishZone 3Below 2 pCi/L
West Baton Rouge ParishZone 3Below 2 pCi/L
West Carroll ParishZone 3Below 2 pCi/L
West Feliciana ParishZone 3Below 2 pCi/L
Winn ParishZone 3Below 2 pCi/L
Source: U.S. EPA Map of Radon Zones (data file published June 2024).

What the EPA radon zones mean

  • Zone 1 (highest potential): predicted average indoor screening level greater than 4 pCi/L. In Louisiana: 0 parishes (0%).
  • Zone 2 (moderate potential): predicted average between 2 and 4 pCi/L. In Louisiana: 0 parishes (0%).
  • Zone 3 (low potential): predicted average below 2 pCi/L. In Louisiana: 64 parishes (100%).

The EPA built the map from indoor radon measurements, geology, soil permeability and type of house foundation. It was made to help governments and builders target resources, not to decide whether a single home needs testing.

How to test for radon in Louisiana

Testing is the only way to know your home’s radon level. Short-term test kits (2 to 90 days) are sold at hardware stores and online, and some state programs offer kits at low cost; check with the Louisiana Department of Environmental Quality, Radon Program. Test in the lowest lived-in level of the home, with windows and doors closed, and follow the kit instructions.

  • Do-it-yourself kits: a simple, low-cost first step for your own home.
  • Long-term tests (more than 90 days): give a better picture of your home’s year-round average.
  • Certified professionals: look for certification from the National Radon Proficiency Program (NRPP) or the National Radon Safety Board (NRSB), and ask the state program whether Louisiana requires a state license.
  • Buying or selling a home: ask for a radon test as part of the home inspection.

If your radon level is high

The EPA recommends fixing your home if the radon level is 4 pCi/L or higher, and considering a fix between 2 and 4 pCi/L. The most common fix is a radon mitigation system (sub-slab depressurization), which pulls radon from under the foundation and vents it outside, above the roof line.

  • The EPA says most homes can be fixed for about the same cost as other common home repairs; the price depends on the size and design of the home.
  • Get estimates from more than one qualified, certified mitigation contractor. See our radon mitigation cost guide for typical prices.
  • Test again after the system is installed, and retest every few years.

Learn more: safe radon levels · how to test · test kits compared · radon and home sales · radon in well water

Louisiana radon program

The Louisiana Department of Environmental Quality, Radon Program answers questions from residents about radon testing, results and certified professionals.

Contact details as listed by the state radon program directory. Please confirm on the program’s website before calling.

Frequently asked questions

Is radon a problem in Louisiana?

None of Louisiana’s 64 parishes are in EPA Zone 1, but high radon levels can be found in any home, in any zone. Testing is the only way to know your level.

Do I need to test if my parish is in Zone 2 or 3?

Yes. The EPA zones show predicted averages for large areas, and they were not designed to decide whether a single home needs testing. The EPA recommends testing every home.

What radon level is safe?

There is no known safe level of radon. The EPA recommends fixing your home at 4 pCi/L or higher and considering a fix between 2 and 4 pCi/L.

Who can I contact about radon in Louisiana?

The Louisiana Department of Environmental Quality, Radon Program answers questions about testing, results and certified professionals. Phone: 225-219-3041.

Sources