Louisiana water quality
Louisiana has 1,125 active public water systems (5,013 on file total), 815 of them graded by TapGraded.
Grade distribution
Biggest water systems
BATON ROUGE WATER COMPANY
BATON ROUGE, LA · 596,844 served
NEW ORLEANS CARROLLTON WATER WORKS
NEW ORLEANS, LA · 334,903 served
E JEFFERSON WW DISTRICT 1
JEFFERSON, LA · 275,163 served
CITY OF SHREVEPORT WATER SYSTEM
SHREVEPORT, LA · 192,378 served
LAFAYETTE UTILITIES WATER SYSTEM
LAFAYETTE, LA · 169,389 served
W JEFFERSON WW DISTRICT 2
JEFFERSON, LA · 140,264 served
SCHRIEVER WATER TREATMENT SERVICE AREA
HOUMA, LA · 116,460 served
LAFOURCHE WATER DISTRICT 1
LOCKPORT, LA · 81,609 served
CITY OF BOSSIER CITY WATER SYSTEM
BOSSIER CITY, LA · 79,506 served
CITY OF LAKE CHARLES WATER SYSTEM
LAKE CHARLES, LA · 79,500 served
Lowest-graded systems
Active, graded systems serving at least 10,000 people, ordered by lowest Tap Grade first.
VILLAGE OF PARKS WATER SYSTEM
PARKS, LA · 12,801 served
PORT SULPHUR WATER DISTRICT
BELLE CHASSE, LA · 10,308 served
NEW ORLEANS ALGIERS WATER WORKS
NEW ORLEANS, LA · 52,785 served
CITY OF BOGALUSA WATER SYSTEM
BOGALUSA, LA · 14,000 served
VILLAGE WATER SYSTEM
BENTON, LA · 10,890 served
CITY OF LEESVILLE WATER SYSTEM
LEESVILLE, LA · 10,545 served
BAYOU TECHE WATER WORKS
LOREAUVILLE, LA · 10,137 served
CITY OF PINEVILLE WATER SYSTEM
PINEVILLE, LA · 20,358 served
CITY OF OPELOUSAS WATER SYSTEM
OPELOUSAS, LA · 20,388 served
CITY OF SHREVEPORT WATER SYSTEM
SHREVEPORT, LA · 192,378 served
Cities in Louisiana
Source: EPA SDWIS/ECHO · Data as of 2026Q2