Louisiana tap water
1 of 258 Louisiana water systems with full PFAS testing (0%) averaged above a 2024 federal PFAS level at one or more sampling points.
- 896 active community water systems in the EPA file; 244 serve 3,300+ people and have a full PFAS set.
- 435 systems had at least one health-based violation since 2021-10-26.
- 1 systems report a lead 90th percentile above 15 ppb (some results are old; check each system page).
Largest systems
| System | People served | PFAS above a 2024 level? | Health-based violations since 2021-10-26 |
|---|---|---|---|
| Baton Rouge Water Company | 596,844 | No | 0 |
| New Orleans Carrollton Water Works | 334,903 | No | 1 |
| E Jefferson Ww District 1 | 275,163 | No | 0 |
| City of Shreveport Water System | 192,378 | No | 20 |
| Lafayette Utilities Water System | 169,389 | No | 0 |
| W Jefferson Ww District 2 | 140,264 | No | 1 |
| Schriever Water Treatment Service Area | 116,460 | No | 0 |
| Lafourche Water District 1 | 81,609 | No | 0 |
Counties
St. Tammany Parish County18 systems with full PFAS testingCalcasieu Parish County13 systems with full PFAS testingOuachita Parish County12 systems with full PFAS testingSt. Landry Parish County11 systems with full PFAS testing
All 18 utilities with a page in Louisiana
- Baton Rouge Water Company 596,844
- City of Alexandria Water System 66,798
- City of Bossier City Water System 79,506
- City of Lake Charles Water System 79,500
- City of Monroe Water System 57,000
- City of Shreveport Water System 192,378
- E Jefferson Ww District 1 275,163
- Lafayette Utilities Water System 169,389
- Lafourche Water District 1 81,609
- Lawco - New Iberia Water System 59,928
- New Orleans Algiers Water Works 52,785
- New Orleans Carrollton Water Works 334,903
- Schriever Water Treatment Service Area 116,460
- St Bernard Parish Waterworks 44,783
- St Charles Parish dept of Waterworks 52,879
- Tangipahoa Parish Water District 75,873
- W Jefferson Ww District 2 140,264
- Ward II Water District 78,147
Why not "the state's water quality"? You drink from one utility, not a state. Rollups count systems, not people, so one large utility counts the same as a small one. Use the system pages for your actual water.
Not medical or legal advice. UCMR 5 results are screening data, not compliance determinations.
Sources and freshness
Public-water-system facts, violations and lead/copper results: EPA ECHO SDWA download (SDWIS snapshot 2026-10-13). PFAS and lithium results: EPA UCMR 5 final data (sampling 2023–2025). Both are U.S. government works, downloaded 2026-10-26. Numbers are computed by the published method; the same fields are in the open data files.