Louisiana drinking water quality
Louisiana has 1,216 active public water systems serving 5.3 million people. 703 of them, 58%, had at least one EPA violation in the past three years, 449 have an unresolved violation today, and 119 are designated serious violators by the EPA.
Active systems
1,216
in 64 counties
People served
5.3M
898 community systems serve 5.2M
Violations, past 3 years
703
58% of active systems
Serious violators
119
261 systems carry a health flag
Largest counties
All 64 counties| County | People served | Systems | With violations |
|---|---|---|---|
| East Baton Rouge | 650,087 | 19 | 8 |
| Jefferson | 440,987 | 4 | 1 |
| Orleans | 389,093 | 10 | 2 |
| Lafayette | 303,509 | 61 | 28 |
| St. Tammany | 267,954 | 207 | 92 |
| Caddo | 249,833 | 49 | 36 |
| Calcasieu | 215,171 | 80 | 36 |
| Ouachita | 188,938 | 31 | 17 |
| Rapides | 165,830 | 24 | 8 |
| Livingston | 160,710 | 32 | 12 |
Largest community water systems
All 1,216 systems| System | Serves | Status |
|---|---|---|
| Baton Rouge Water Company East Baton Rouge Parish |
596,844 | |
| New Orleans Carrollton Water Works Orleans Parish |
334,903 | |
| E Jefferson WW District 1 Jefferson Parish |
275,163 | |
| City of Shreveport Water System Caddo Parish |
192,378 | |
| Lafayette Utilities Water System Lafayette Parish |
169,389 | |
| W Jefferson WW District 2 Jefferson Parish |
140,264 | |
| Schriever Water Treatment Service Area Terrebonne Parish |
116,460 | |
| Lafourche Water District 1 Lafourche Parish |
81,609 | |
| City of Bossier City Water System Bossier Parish |
79,506 | |
| City of Lake Charles Water System Calcasieu Parish |
79,500 |
About the Louisiana data
Retrieved from EPA ECHO on Oct 11, 2026. EPA records for Louisiana systems do not include town names, so searches here match on ZIP code, street address, or county.