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Louisiana Water Quality
1,234 public water systems serving 5,316,532 people.
Water Systems
1,234
Total Violations
115,060
Violation Rate
92.5%
PFAS Detection
82.3%
218 of 265 tested
Largest 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
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 LAKE CHARLES WATER SYSTEM
LAKE CHARLES, LA · 79,500 served
CITY OF BOSSIER CITY WATER SYSTEM
BOSSIER CITY, LA · 78,960 served
WARD II WATER DISTRICT
DENHAM SPRINGS, LA · 73,506 served
TANGIPAHOA PARISH WATER DISTRICT
HAMMOND, LA · 72,504 served
CITY OF ALEXANDRIA WATER SYSTEM
ALEXANDRIA, LA · 66,798 served
NEW IBERIA WATER SYSTEM (LAWCO)
BATON ROUGE, LA · 59,928 served
MONROE WATER SYSTEM
MONROE, LA · 57,000 served
ST CHARLES PARISH DEPT OF WATERWORKS
LULING, LA · 52,879 served
NEW ORLEANS ALGIERS WATER WORKS
NEW ORLEANS, LA · 52,785 served
ST BERNARD PARISH WATERWORKS
CHALMETTE, LA · 44,783 served
SLIDELL WATER SUPPLY
SLIDELL, LA · 35,547 served
ST JOHN WATER DISTRICT 3
LAPLACE, LA · 31,965 served
Most Violations
#1 TOWN OF FERRIDAY WATER SYSTEM FERRIDAY
2,042 #2 FAIRVIEW UNION WATER SYSTEM COUSHATTA
1,589 #3 HUDSON GAARS MILL WATER SYSTEM DODSON
1,416 #4 VILLAGE OF SIKES WATER SYSTEM SIKES
1,279 #5 VILLAGE OF CALVIN WATER SYSTEM CALVIN
1,195 #6 LITROE WATER SYSTEM MARION
1,110 #7 VIXEN WATER SYSTEM ALEXANDRIA
1,090 #8 OIL CITY WATER WORKS OIL CITY
1,085 #9 PENDLETON WATER ASSOCIATION MANY
1,060 #10 UNION PARISH WATERWORKS DISTRICT 1 FARMERVILLE
939 #11 PLEASANT HILLS-CROSSROADS WATER SYSTEMS JOYCE
916 #12 ALBERTA WATER SYSTEM CASTOR
837 #13 MAGNOLIA-SPRING CREEK SUBDIVISION DES PERES
799 #14 BELMONT WATERWORKS INC BELMONT
790 #15 OZONE PINE SUBDIVISION SLIDELL
789 Counties in Louisiana
East Baton Rouge Parish
19 systems · 650,087 served
· 566 violations
Jefferson Parish
4 systems · 440,987 served
· 247 violations
Orleans Parish
10 systems · 389,093 served
· 157 violations
Lafayette Parish
62 systems · 303,179 served
· 2,569 violations
St. Tammany Parish
213 systems · 266,825 served
· 7,149 violations
Caddo Parish
48 systems · 249,641 served
· 5,038 violations
Calcasieu Parish
80 systems · 216,042 served
· 3,535 violations
Ouachita Parish
31 systems · 188,938 served
· 4,888 violations
Rapides Parish
24 systems · 165,953 served
· 1,472 violations
Livingston Parish
33 systems · 155,925 served
· 997 violations
Bossier Parish
27 systems · 140,488 served
· 4,038 violations
Tangipahoa Parish
35 systems · 131,935 served
· 1,445 violations
Terrebonne Parish
2 systems · 128,118 served
· 50 violations
St. Landry Parish
29 systems · 111,945 served
· 2,173 violations
Lafourche Parish
2 systems · 96,471 served
· 191 violations
St. Martin Parish
25 systems · 77,708 served
· 1,995 violations
Iberia Parish
15 systems · 75,947 served
· 690 violations
Vermilion Parish
12 systems · 70,792 served
· 645 violations
Vernon Parish
20 systems · 66,152 served
· 623 violations
St. Mary Parish
16 systems · 63,659 served
· 1,325 violations
Lincoln Parish
22 systems · 60,724 served
· 1,889 violations
Acadia Parish
13 systems · 59,922 served
· 724 violations
Webster Parish
35 systems · 53,565 served
· 2,493 violations
St. Charles Parish
1 systems · 52,879 served
· 9 violations
Avoyelles Parish
17 systems · 52,812 served
· 674 violations
Beauregard Parish
9 systems · 50,035 served
· 303 violations
St. John the Baptist Parish
12 systems · 47,793 served
· 1,210 violations
St. Bernard Parish
2 systems · 45,143 served
· 447 violations
Iberville Parish
13 systems · 44,903 served
· 388 violations
Natchitoches Parish
14 systems · 44,641 served
· 3,262 violations
Showing top 30 of 64 counties.