Radon levels in Louisiana: Low
The model predicts a population-weighted basement average of 1.4 pCi/L across Louisiana's 64 counties - about 24% below the US average of 1.8 pCi/L. Above-ground floors average 0.7 pCi/L.
Predicted (model estimate). The pCi/L figures on this page are long-term area averages from a peer-reviewed national model built on millions of real radon tests (2001-2021). They describe the typical home in this area - not your home, which can be several times higher or lower. The EPA radon zone is a separate, 1993 county-level classification. How the numbers work.
0 / 64
EPA Zone 1 counties (0%)
0 / 64
Zone 2 / Zone 3 counties
0
counties predicted ≥ 4 pCi/L
0%
of ZIP codes predicted ≥ 4 pCi/L
Louisiana counties by predicted radon
Sorted highest to lowest predicted basement average. 64 counties.
| County | Predicted basement | Upstairs | Grade | EPA zone | ZIPs |
|---|---|---|---|---|---|
| Beauregard Parish | 1.6 pCi/L | 0.7 | Low | EPA Zone 3 | 6 |
| East Feliciana Parish | 1.5 pCi/L | 0.8 | Low | EPA Zone 3 | 6 |
| Grant Parish | 1.5 pCi/L | 0.8 | Low | EPA Zone 3 | 6 |
| Allen Parish | 1.5 pCi/L | 0.7 | Low | EPA Zone 3 | 6 |
| Sabine Parish | 1.5 pCi/L | 0.8 | Low | EPA Zone 3 | 8 |
| West Baton Rouge Parish | 1.5 pCi/L | 0.7 | Low | EPA Zone 3 | 4 |
| Jackson Parish | 1.5 pCi/L | 0.8 | Low | EPA Zone 3 | 4 |
| St. Tammany Parish | 1.5 pCi/L | 0.7 | Low | EPA Zone 3 | 13 |
| West Feliciana Parish | 1.5 pCi/L | 0.8 | Low | EPA Zone 3 | 2 |
| Acadia Parish | 1.5 pCi/L | 0.8 | Low | EPA Zone 3 | 11 |
| Jefferson Davis Parish | 1.5 pCi/L | 0.8 | Low | EPA Zone 3 | 6 |
| LaSalle Parish | 1.5 pCi/L | 0.8 | Low | EPA Zone 3 | 3 |
| Livingston Parish | 1.5 pCi/L | 0.6 | Low | EPA Zone 3 | 9 |
| St. Helena Parish | 1.5 pCi/L | 0.7 | Low | EPA Zone 3 | 2 |
| Bossier Parish | 1.5 pCi/L | 0.7 | Low | EPA Zone 3 | 8 |
| Claiborne Parish | 1.5 pCi/L | 0.8 | Low | EPA Zone 3 | 5 |
| Union Parish | 1.5 pCi/L | 0.8 | Low | EPA Zone 3 | 7 |
| Webster Parish | 1.5 pCi/L | 0.7 | Low | EPA Zone 3 | 9 |
| Lincoln Parish | 1.5 pCi/L | 0.8 | Low | EPA Zone 3 | 5 |
| Vernon Parish | 1.5 pCi/L | 0.7 | Low | EPA Zone 3 | 8 |
| Red River Parish | 1.5 pCi/L | 0.7 | Low | EPA Zone 3 | 2 |
| St. Landry Parish | 1.5 pCi/L | 0.7 | Low | EPA Zone 3 | 9 |
| Tangipahoa Parish | 1.5 pCi/L | 0.7 | Low | EPA Zone 3 | 12 |
| Winn Parish | 1.5 pCi/L | 0.7 | Low | EPA Zone 3 | 6 |
| Bienville Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 6 |
| East Carroll Parish | 1.4 pCi/L | 0.6 | Low | EPA Zone 3 | 3 |
| Lafourche Parish | 1.4 pCi/L | 0.6 | Low | EPA Zone 3 | 10 |
| Pointe Coupee Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 13 |
| Rapides Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 17 |
| Washington Parish | 1.4 pCi/L | 0.8 | Low | EPA Zone 3 | 4 |
| Avoyelles Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 11 |
| Caldwell Parish | 1.4 pCi/L | 0.8 | Low | EPA Zone 3 | 3 |
| De Soto Parish | 1.4 pCi/L | 0.8 | Low | EPA Zone 3 | 8 |
| Iberville Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 8 |
| Plaquemines Parish | 1.4 pCi/L | 0.6 | Low | EPA Zone 3 | 5 |
| St. Charles Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 9 |
| Evangeline Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 3 |
| Richland Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 2 |
| Vermilion Parish | 1.4 pCi/L | 0.8 | Low | EPA Zone 3 | 5 |
| Ouachita Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 6 |
| West Carroll Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 3 |
| Lafayette Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 10 |
| Natchitoches Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 9 |
| Ascension Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 7 |
| Calcasieu Parish | 1.4 pCi/L | 0.6 | Low | EPA Zone 3 | 12 |
| Catahoula Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 6 |
| Franklin Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 5 |
| Cameron Parish | 1.4 pCi/L | 0.6 | Low | EPA Zone 3 | 5 |
| Concordia Parish | 1.4 pCi/L | 0.6 | Low | EPA Zone 3 | 4 |
| St. James Parish | 1.4 pCi/L | 0.6 | Low | EPA Zone 3 | 6 |
| St. Martin Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 2 |
| Caddo Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 23 |
| St. John the Baptist Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 5 |
| St. Mary Parish | 1.4 pCi/L | 0.6 | Low | EPA Zone 3 | 4 |
| Madison Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 2 |
| Morehouse Parish | 1.4 pCi/L | 0.6 | Low | EPA Zone 3 | 6 |
| Terrebonne Parish | 1.4 pCi/L | 0.6 | Low | EPA Zone 3 | 10 |
| Assumption Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 6 |
| Iberia Parish | 1.4 pCi/L | 0.7 | Low | EPA Zone 3 | 5 |
| East Baton Rouge Parish | 1.3 pCi/L | 0.6 | Low | EPA Zone 3 | 20 |
| Tensas Parish | 1.3 pCi/L | 0.7 | Low | EPA Zone 3 | 3 |
| St. Bernard Parish | 1.3 pCi/L | 0.6 | Low | EPA Zone 3 | 5 |
| Jefferson Parish | 1.2 pCi/L | 0.6 | Low | EPA Zone 3 | 17 |
| Orleans Parish | 1.2 pCi/L | 0.6 | Low | EPA Zone 3 | 17 |
Louisiana radon questions
- Is radon high in Louisiana?
- Louisiana's population-weighted predicted basement average is 1.4 pCi/L, about 24% below the US average of 1.8. 0 of its 64 modeled counties are predicted at or above the EPA action level of 4 pCi/L, 0 are in the 2-4 "consider fixing" range and 64 are below 2. 0% of Louisiana ZIP codes are predicted at 4 or higher.
- Which Louisiana county has the highest radon?
- Beauregard Parish has the highest predicted basement average in Louisiana at 1.6 pCi/L (EPA Zone 3). The lowest is Orleans Parish at 1.2 pCi/L. These are modeled area averages; individual homes in any county can test far higher.
- How many EPA Zone 1 counties are in Louisiana?
- 0 of Louisiana's 64 counties (0%) are EPA Zone 1 (highest potential), 0 are Zone 2 and 64 are Zone 3. The EPA zone map dates from 1993; the predicted values on this page come from a 2001-2021 model built on millions of actual tests, so the two can disagree for a given county.
- Should I test for radon in Louisiana?
- Yes. Even though Louisiana's predicted average is below 2 pCi/L, the EPA recommends every home be tested - radon varies house to house, and 0% of Louisiana ZIP codes are still predicted at 2 pCi/L or higher.
Louisiana radon program
Many states offer free or discounted test kits and keep lists of certified mitigators. Find the Louisiana radon office through the EPA state radon contacts page. Then read how to test and what mitigation costs.