Louisiana Water Systems with Most Unresolved Health-Based Violations — 2026
Louisiana community water utilities ranked by open federal health-based drinking water violations in EPA's SDWIS enforcement records, with demographic context from the Census American Community Survey.
ranked
with demographic data
vintage
boundaries (March 2026)
These 32 Louisiana water utilities carry the most open federal health-based violations in EPA's enforcement records. Sorted by unresolved count; demographic context from the U.S. Census is shown alongside but is not a ranking input.
| Rank | Water System | State | Pop served | Unresolved health violations | Health viol. (5yr) | % PoC served | % Below 200% FPL | Last violation |
|---|---|---|---|---|---|---|---|---|
| 1 | Town of Ferriday Water System | Louisiana | 3,553 | 32 | 36 | 57% | 56% | 2025-10-01 |
| 2 | Franklin Water Supply | Louisiana | 8,444 | 29 | 31 | 55% | 45% | 2025-06-21 |
| 3 | Mansfield Water System | Louisiana | 4,045 | 11 | 15 | 72% | 60% | 2025-03-01 |
| 4 | City of Bogalusa Water System | Louisiana | 7,294 | 11 | 12 | 43% | 49% | 2025-07-01 |
| 5 | Tallulah Water System | Louisiana | 5,558 | 9 | 24 | 71% | 62% | 2025-07-02 |
| 6 | Grambling Water System | Louisiana | 3,903 | 9 | 11 | 73% | 69% | 2025-11-18 |
| 7 | Rayville Water System | Louisiana | 3,326 | 9 | 9 | 40% | 49% | 2025-10-01 |
| 8 | Shreveport Water System | Louisiana | 160,108 | 7 | 20 | 61% | 45% | 2025-10-01 |
| 9 | Town of Haughton Water System | Louisiana | 3,872 | 7 | 8 | 25% | 41% | 2025-08-16 |
| 10 | Calcasieu Parish Ww District No 4 | Louisiana | 3,620 | 6 | 7 | 18% | 35% | 2025-12-06 |
| 11 | Village Water System | Louisiana | 7,222 | 5 | 19 | 29% | 43% | 2024-07-01 |
| 12 | Winnsboro Water System | Louisiana | 4,426 | 5 | 11 | 39% | 52% | 2025-11-11 |
| 13 | Patterson Water System | Louisiana | 4,405 | 5 | 5 | 47% | 48% | 2025-10-01 |
| 14 | Westlake City of Water System | Louisiana | 5,281 | 4 | 4 | 18% | 36% | 2024-12-18 |
| 15 | City of Opelousas Water System | Louisiana | 14,662 | 3 | 6 | 63% | 51% | 2025-04-02 |
| 16 | City of Oakdale Water System | Louisiana | 5,657 | 3 | 6 | 46% | 43% | 2024-07-01 |
| 17 | City of Leesville Water System | Louisiana | 5,774 | 3 | 4 | 28% | 42% | 2024-01-01 |
| 18 | City of Winnfield Water System | Louisiana | 3,924 | 2 | 4 | 47% | 47% | 2025-07-01 |
| 19 | City of Jennings Water System | Louisiana | 9,789 | 2 | 2 | 24% | 36% | 2024-01-01 |
| 20 | Savoy Swords Water System Inc | Louisiana | 6,622 | 2 | 2 | 32% | 46% | 2025-04-01 |
| 21 | New Orleans Algiers Water Works | Louisiana | 37,431 | 1 | 6 | 75% | 42% | 2025-01-01 |
| 22 | Town of Church Point Water System | Louisiana | 3,655 | 1 | 5 | 27% | 39% | 2025-02-01 |
| 23 | Bayou Teche Water Works | Louisiana | 3,454 | 1 | 5 | 29% | 38% | 2025-07-01 |
| 24 | City of Breaux Bridge Water System | Louisiana | 9,417 | 1 | 2 | 38% | 41% | 2021-07-08 |
| 25 | New Roads Water System | Louisiana | 5,269 | 1 | 2 | 60% | 40% | 2025-10-11 |
| 26 | New Orleans Carrollton Water Works | Louisiana | 346,965 | 1 | 1 | 70% | 41% | 2025-01-01 |
| 27 | Slidell Water Supply | Louisiana | 28,337 | 1 | 1 | 37% | 31% | 2022-09-01 |
| 28 | Covington Water Supply | Louisiana | 26,739 | 1 | 1 | 21% | 23% | 2025-03-11 |
| 29 | City of Baker Water System | Louisiana | 11,555 | 1 | 1 | 76% | 41% | 2023-01-01 |
| 30 | Bastrop Water System | Louisiana | 11,184 | 1 | 1 | 55% | 52% | 2025-05-01 |
| 31 | City of Scott Water System | Louisiana | 7,622 | 1 | 1 | 37% | 38% | 2023-07-25 |
| 32 | Parish Utilities of Ascension | Louisiana | 3,992 | 1 | 1 | 73% | 51% | 2024-07-01 |
How to read this ranking
Each row links to a full utility profile with violation history, lead testing results, and service-area ZIPs. The demographic context columns are from independent data sources (ACS, not EJScreen) and are provided for readers who want to examine equity patterns alongside the operational data.
See the full methodology for calculation details, data vintages, and known limitations.
Frequently asked questions
What is an unresolved health-based violation?
A violation of a federal Safe Drinking Water Act standard (Maximum Contaminant Level, Treatment Technique, or Monitoring requirement for a health-based contaminant) that has not been formally returned to compliance in EPA records. These reflect ongoing public-health concerns documented in EPA's ECHO enforcement database.
Why show demographic context next to violations?
Federal Safe Drinking Water Act data does not distinguish between communities by race or income — violations are violations regardless of who is served. We publish demographic columns so readers can independently examine whether specific systems with long-running violations also serve disproportionately low-income or non-white populations. We do not claim causation; we report two independent facts side by side.
Are these the most dangerous water systems in the country?
Not necessarily. "Unresolved" counts procedural and technical violations alongside contaminant exceedances. A high count indicates a system that federal regulators have flagged repeatedly without resolution. For any specific system, click through to its profile page for the individual violations on record.
Where does the data come from?
Violation records come from EPA's Safe Drinking Water Information System (SDWIS) via the ECHO enforcement database, refreshed weekly. Demographic context comes from the U.S. Census American Community Survey (ACS) 5-year estimates (2019-2023), aggregated from block-group level to utility-level using EPA's Community Water System Service Area Boundaries v3 population weights.
ZipCheckup is an independent public-data tool. We are a referral service and do not provide water testing, remediation, or utility services. Rankings reflect publicly-available federal data and are provided for informational purposes. For issues with your specific water system, contact your local water utility or state drinking water program.