Radon levels in Louisiana

Verified county-level radon indicators are available for 36 Louisiana counties. Select a county for its source period and sample details.

High results are most common in Jefferson Parish (3%) and least common in Tangipahoa Parish (0%)Share of tests at or above 4 pCi/L by county · Radon test results from laboratories, 2008–2017 · 36 of 64 counties have data
Acadia Parish: 0% of tests at or above 4 pCi/L · 1 testsAllen Parish: no dataAscension Parish: 0% of tests at or above 4 pCi/L · 19 testsAssumption Parish: no dataAvoyelles Parish: no dataBeauregard Parish: no dataBienville Parish: no dataBossier Parish: 6% of tests at or above 4 pCi/L · 18 testsCaddo Parish: 17% of tests at or above 4 pCi/L · 23 testsCalcasieu Parish: 0% of tests at or above 4 pCi/L · 143 testsCaldwell Parish: no dataCameron Parish: 0% of tests at or above 4 pCi/L · 1 testsCatahoula Parish: no dataClaiborne Parish: no dataConcordia Parish: no dataDe Soto Parish: 0% of tests at or above 4 pCi/L · 8 testsEast Baton Rouge Parish: 0% of tests at or above 4 pCi/L · 45 testsEast Carroll Parish: no dataEast Feliciana Parish: no dataEvangeline Parish: 0% of tests at or above 4 pCi/L · 2 testsFranklin Parish: 100% of tests at or above 4 pCi/L · 1 testsGrant Parish: no dataIberia Parish: 0% of tests at or above 4 pCi/L · 2 testsIberville Parish: 0% of tests at or above 4 pCi/L · 1 testsJackson Parish: no dataJefferson Parish: 3% of tests at or above 4 pCi/L · 40 testsJefferson Davis Parish: no dataLafayette Parish: 7% of tests at or above 4 pCi/L · 27 testsLafourche Parish: 0% of tests at or above 4 pCi/L · 1 testsLa Salle Parish: no dataLincoln Parish: 0% of tests at or above 4 pCi/L · 13 testsLivingston Parish: 17% of tests at or above 4 pCi/L · 6 testsMadison Parish: no dataMorehouse Parish: no dataNatchitoches Parish: 0% of tests at or above 4 pCi/L · 4 testsOrleans Parish: 0% of tests at or above 4 pCi/L · 31 testsOuachita Parish: 0% of tests at or above 4 pCi/L · 6 testsPlaquemines Parish: 0% of tests at or above 4 pCi/L · 2 testsPointe Coupee Parish: no dataRapides Parish: 0% of tests at or above 4 pCi/L · 4 testsRed River Parish: 0% of tests at or above 4 pCi/L · 4 testsRichland Parish: 0% of tests at or above 4 pCi/L · 1 testsSabine Parish: 0% of tests at or above 4 pCi/L · 1 testsSt. Bernard Parish: no dataSt. Charles Parish: 0% of tests at or above 4 pCi/L · 1 testsSt. Helena Parish: no dataSt. James Parish: no dataSt. John the Baptist Parish: 0% of tests at or above 4 pCi/L · 2 testsSt. Landry Parish: 33% of tests at or above 4 pCi/L · 3 testsSt. Martin Parish: 0% of tests at or above 4 pCi/L · 1 testsSt. Mary Parish: no dataSt. Tammany Parish: 0% of tests at or above 4 pCi/L · 23 testsTangipahoa Parish: 0% of tests at or above 4 pCi/L · 43 testsTensas Parish: no dataTerrebonne Parish: 0% of tests at or above 4 pCi/L · 15 testsUnion Parish: 0% of tests at or above 4 pCi/L · 1 testsVermilion Parish: no dataVernon Parish: no dataWashington Parish: 0% of tests at or above 4 pCi/L · 1 testsWebster Parish: 0% of tests at or above 4 pCi/L · 4 testsWest Baton Rouge Parish: no dataWest Carroll Parish: no dataWest Feliciana Parish: no dataWinn Parish: 0% of tests at or above 4 pCi/L · 1 tests
  • Under 10%
  • 10–20%
  • 20–30%
  • 30–40%
  • 40% or more
  • No data

Counties

CountyTests% ≥ 4 pCi/LMedian (pCi/L)EPA zone (1993)Source
Acadia Parish10%0.7Zone 3Radon test results from laboratories through 2017
Allen Parish———Zone 3—
Ascension Parish190%0.5Zone 3Radon test results from laboratories through 2017
Assumption Parish———Zone 3—
Avoyelles Parish———Zone 3—
Beauregard Parish———Zone 3—
Bienville Parish———Zone 3—
Bossier Parish186%0.2Zone 3Radon test results from laboratories through 2017
Caddo Parish2317%1.2Zone 3Radon test results from laboratories through 2017
Calcasieu Parish1430%0.1Zone 3Radon test results from laboratories through 2017
Caldwell Parish———Zone 3—
Cameron Parish10%0.1Zone 3Radon test results from laboratories through 2017
Catahoula Parish———Zone 3—
Claiborne Parish———Zone 3—
Concordia Parish———Zone 3—
De Soto Parish80%0.2Zone 3Radon test results from laboratories through 2017
East Baton Rouge Parish450%0.7Zone 3Radon test results from laboratories through 2017
East Carroll Parish———Zone 3—
East Feliciana Parish———Zone 3—
Evangeline Parish20%0.7Zone 3Radon test results from laboratories through 2017
Franklin Parish1100%5.7Zone 3Radon test results from laboratories through 2017
Grant Parish———Zone 3—
Iberia Parish20%2.4Zone 3Radon test results from laboratories through 2017
Iberville Parish10%0.6Zone 3Radon test results from laboratories through 2017
Jackson Parish———Zone 3—
Jefferson Parish403%0.2Zone 3Radon test results from laboratories through 2017
Jefferson Davis Parish———Zone 3—
La Salle Parish———Zone 3—
Lafayette Parish277%0.8Zone 3Radon test results from laboratories through 2017
Lafourche Parish10%0.5Zone 3Radon test results from laboratories through 2017
Lincoln Parish130%1.5Zone 3Radon test results from laboratories through 2017
Livingston Parish617%0.9Zone 3Radon test results from laboratories through 2017
Madison Parish———Zone 3—
Morehouse Parish———Zone 3—
Natchitoches Parish40%0.5Zone 3Radon test results from laboratories through 2017
Orleans Parish310%0.2Zone 3Radon test results from laboratories through 2017
Ouachita Parish60%1.9Zone 3Radon test results from laboratories through 2017
Plaquemines Parish20%0.5Zone 3Radon test results from laboratories through 2017
Pointe Coupee Parish———Zone 3—
Rapides Parish40%0.8Zone 3Radon test results from laboratories through 2017
Red River Parish40%0.2Zone 3Radon test results from laboratories through 2017
Richland Parish10%0.9Zone 3Radon test results from laboratories through 2017
Sabine Parish10%0.1Zone 3Radon test results from laboratories through 2017
St. Bernard Parish———Zone 3—
St. Charles Parish10%0.9Zone 3Radon test results from laboratories through 2017
St. Helena Parish———Zone 3—
St. James Parish———Zone 3—
St. John the Baptist Parish20%0.2Zone 3Radon test results from laboratories through 2017
St. Landry Parish333%0.8Zone 3Radon test results from laboratories through 2017
St. Martin Parish10%3.8Zone 3Radon test results from laboratories through 2017
St. Mary Parish———Zone 3—
St. Tammany Parish230%0.2Zone 3Radon test results from laboratories through 2017
Tangipahoa Parish430%0.1Zone 3Radon test results from laboratories through 2017
Tensas Parish———Zone 3—
Terrebonne Parish150%0.5Zone 3Radon test results from laboratories through 2017
Union Parish10%2.8Zone 3Radon test results from laboratories through 2017
Vermilion Parish———Zone 3—
Vernon Parish———Zone 3—
Washington Parish10%0.1Zone 3Radon test results from laboratories through 2017
Webster Parish40%0.6Zone 3Radon test results from laboratories through 2017
West Baton Rouge Parish———Zone 3—
West Carroll Parish———Zone 3—
West Feliciana Parish———Zone 3—
Winn Parish10%1.1Zone 3Radon test results from laboratories through 2017

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