| HINESTON WATER SYSTEM, INC | HINESTON, LA | 1,089 | 151 | — |
| HIGHWAY 1148 WATER SYSTEM | PLAQUEMINE, LA | 1,086 | 0 | — |
| SIMSBORO WATER SYSTEM | SIMSBORO, LA | 1,083 | 49 | — |
| EAST CARROLL WS SOUTH | TRANSYLVANIA, LA | 1,071 | 123 | Detected |
| SOUTHWEST AVOYELLES WATER DISTRICT | BUNKIE, LA | 1,053 | 103 | — |
| POLAND WATER ASSOCIATION | ECHO, LA | 1,044 | 45 | — |
| BAYOU MACON WATER SYSTEM | DELHI, LA | 1,041 | 171 | — |
| BELLWOOD WATER SYSTEM | PROVENCAL, LA | 1,032 | 535 | — |
| JENKINS COMMUNITY WATER SYSTEM | DOYLINE, LA | 1,026 | 179 | — |
| HAGEWOOD WATER SYSTEM | PROVENCAL, LA | 1,017 | 234 | — |
| MORGANZA WATER SYSTEM | MORGANZA, LA | 1,005 | 11 | — |
| WARDS 4 & 5 WATER SYSTEM | GRAYSON, LA | 1,002 | 87 | — |
| STATE OF LA MILITARY DEPT - CAMP MINDEN | MINDEN, LA | 1,001 | 16 | — |
| TOOMEY REST AREA WATER SYSTEM | LAKE CHARLES, LA | 1,001 | 1 | — |
| BUTTE LA ROSE REST AREA WATER SYSTEM | LAFAYETTE, LA | 1,001 | 28 | — |
| ST TAM PARISH - MEDCATH (LA HEART) | COVINGTON, LA | 1,001 | 6 | — |
| FONTAINEBLEAU STATE PARK | SPRINGFIELD, LA | 1,000 | 65 | — |
| KNIGHTS OF COLUMBUS BINGO | COVINGTON, LA | 1,000 | 4 | — |
| WINN DIXIE #1500 | HAMMOND, LA | 1,000 | 11 | — |
| MOORINGSPORT WATER SYSTEM | MOORINGSPORT, LA | 999 | 724 | — |
| KILLIAN WATER SYSTEM | BOSSIER CITY, LA | 999 | 40 | — |
| RELAY STATION | SHREVEPORT, LA | 999 | 14 | — |
| CRAWDADDYS TRUCK STOP WATER SYSTEM | KEITHVILLE, LA | 999 | 38 | — |
| CAMP BETHANY WATER SYSTEM | BETHANY, LA | 999 | 0 | — |
| LACOMBE STORES | LACOMBE, LA | 999 | 3 | — |
| BEAUREGARD WATERWORKS DISTRICT NO. 6 | MERRYVILLE, LA | 993 | 6 | — |
| EAST JENA WATER SYSTEM INC. | JENA, LA | 990 | 9 | — |
| PLEASANT HILL WATER SYSTEM | PLEASANT HILL, LA | 990 | 104 | — |
| GIBSLAND WATER SYSTEM | GIBSLAND, LA | 979 | 122 | — |
| DIVERSION WATER - TERRY HARBOR CAMPSITES | PRAIRIEVILLE, LA | 969 | 33 | — |
| DOYLINE WATERWORKS DISTRICT 1 | DOYLINE, LA | 969 | 71 | Detected |
| TOWN OF ELIZABETH WATER SYSTEM | ELIZABETH, LA | 966 | 10 | — |
| SOUTH DESOTO WATER SYSTEM | MANSFIELD, LA | 963 | 691 | — |
| VILLAGE OF GROSSE TETE WATER SYSTEM | GROSSE TETE, LA | 954 | 24 | — |
| VEGAS STYLE SOUTH | BROUSSARD, LA | 950 | 21 | — |
| ALABAMA WATER SYSTEM | ARCADIA, LA | 948 | 57 | — |
| COLUMBIA WATER SYSTEM | COLUMBIA, LA | 945 | 24 | — |
| WATERWORKS DIST. NO. 10 OF WARD 7 | VINTON, LA | 942 | 9 | — |
| COUNTRY PINES NORTH SUBDIVISION WS | MANDEVILLE, LA | 936 | 100 | — |
| SOUTH MANSFIELD WATER SYSTEM | MANSFIELD, LA | 933 | 195 | — |
| VILLAGE OF SICILY ISLAND | SICILY ISLAND, LA | 930 | 66 | — |
| ST TAM PARISH - RIVER OAKS | COVINGTON, LA | 930 | 1 | — |
| MANGHAM WATER SYSTEM | MANGHAM, LA | 927 | 30 | — |
| CAMERON PARISH WW DISTRICT 2 | HACKBERRY, LA | 926 | 84 | — |
| GILBERT WATER SYSTEM | GILBERT, LA | 915 | 53 | — |
| LINCOLN PARISH WATERWORKS DISTRICT #2 | RUSTON, LA | 915 | 9 | — |
| INTERNATIONAL PAPER (MANSFIELD) | MANSFIELD, LA | 908 | 0 | — |
| CLARKS WATER SYSTEM | CLARKS, LA | 906 | 43 | — |
| MAITLAND WATER WORKS DISTRICT | CLAYTON, LA | 900 | 36 | — |
| PINE PRAIRIE CORRECTIONAL FACILITY | PINE PRAIRIE, LA | 900 | 72 | — |