State
Louisiana: drinking water records
EPA lists 908 community water systems serving homes in Louisiana. 263 took part in EPA's national PFAS survey (UCMR 5), and 48 found at least one PFAS above the level laboratories can measure.
Data as of EPA UCMR 5 final release, August 2026 (file dated Aug 28, 2026) · EPA SDWIS 2026Q2 (file dated Jul 9, 2026). How we build these pages
PFAS in EPA’s final survey
48 of the 263 Louisiana systems in EPA’s national PFAS survey found at least one PFAS, and 1 had a PFOA or PFOS yearly average at or above EPA’s limit. See Louisiana’s PFAS results by system and compound.
Counties
- Acadia Parish 12 systems
- Allen Parish 10 systems
- Ascension Parish 19 systems
- Assumption Parish 1 systems
- Avoyelles Parish 17 systems
- Beauregard Parish 7 systems
- Bienville Parish 20 systems
- Bossier Parish 22 systems
- Caddo Parish 41 systems
- Calcasieu Parish 43 systems
- Caldwell Parish 11 systems
- Cameron Parish 7 systems
- Catahoula Parish 7 systems
- Claiborne Parish 12 systems
- Concordia Parish 7 systems
- De Soto Parish 9 systems
- East Baton Rouge Parish 5 systems
- East Carroll Parish 4 systems
- East Feliciana Parish 10 systems
- Evangeline Parish 13 systems
- Franklin Parish 7 systems
- Grant Parish 13 systems
- Iberia Parish 7 systems
- Iberville Parish 12 systems
- Jackson Parish 19 systems
- Jefferson Davis Parish 8 systems
- Jefferson Parish 4 systems
- LaSalle Parish 12 systems
- Lafayette Parish 59 systems
- Lafourche Parish 2 systems
- Lincoln Parish 20 systems
- Livingston Parish 28 systems
- Madison Parish 4 systems
- Morehouse Parish 15 systems
- Natchitoches Parish 13 systems
- Orleans Parish 2 systems
- Ouachita Parish 26 systems
- Plaquemines Parish 4 systems
- Pointe Coupee Parish 10 systems
- Rapides Parish 22 systems
- Red River Parish 11 systems
- Richland Parish 11 systems
- Sabine Parish 18 systems
- St. Bernard Parish 1 systems
- St. Charles Parish 1 systems
- St. Helena Parish 3 systems
- St. James Parish 4 systems
- St. John the Baptist Parish 4 systems
- St. Landry Parish 28 systems
- St. Martin Parish 14 systems
- St. Mary Parish 12 systems
- St. Tammany Parish 95 systems
- Tangipahoa Parish 21 systems
- Tensas Parish 5 systems
- Terrebonne Parish 2 systems
- Union Parish 20 systems
- Vermilion Parish 10 systems
- Vernon Parish 16 systems
- Washington Parish 14 systems
- Webster Parish 27 systems
- West Baton Rouge Parish 5 systems
- West Carroll Parish 7 systems
- West Feliciana Parish 3 systems
- Winn Parish 12 systems
ZIP reports
Sources
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Database prepared 2026-09-03.