| LAFAYETTE UTILITIES WATER SYSTEM | 169,389 | 2 | Detected |
| LPWDN NORTH REGION | 16,833 | 13 | Detected |
| LPWD SOUTH | 15,132 | 16 | Detected |
| MILTON PURCHASE WATER SYSTEM | 11,430 | 5 | Detected |
| CITY OF CARENCRO WATER SYSTEM | 10,485 | 14 | Detected |
| CITY OF BROUSSARD PURCHASE WATER SYSTEM | 10,242 | 51 | — |
| CITY OF YOUNGSVILLE WATER SYSTEM | 9,915 | 39 | — |
| CITY OF SCOTT WATER SYSTEM | 9,696 | 32 | Detected |
| CITY OF YOUNGSVILLE PURCHASE WS | 8,886 | 18 | Detected |
| CITY OF BROUSSARD WATER SYSTEM | 5,151 | 54 | Detected |
| CITY OF BROUSSARD HWY 90 WATER SYSTEM | 4,182 | 48 | — |
| LPWD NORTH PRODUCTION FACILITY | 4,122 | 6 | Detected |
| LPWDN SOUTH REGION | 4,032 | 4 | — |
| LPWDN PURCHASE WEST SCOTT | 3,051 | 33 | — |
| TOWN OF DUSON WATER SYSTEM | 2,190 | 27 | — |
| MILTON WATER SYSTEM | 1,782 | 25 | — |
| LPWDN WILDERNESS TRAIL | 1,644 | 0 | — |
| ILE DES CANNES WATER SYSTEM | 1,476 | 2 | — |
| LPWDN LA NEUVILLE HOLIDAY SUBDIVISION WS | 1,455 | 0 | — |
| MAGNOLIA-LE TRIOMPHE SUBDIVISION | 1,278 | 47 | — |
| MAGNOLIA-JACKSON SQUARE | 825 | 64 | — |
| LPWDN CARMEL DRIVE | 576 | 0 | — |
| MAGNOLIA-WINDY MEADOWS | 549 | 37 | — |
| MAGNOLIA-GARDEN HEIGHTS SUBDIVISION WS | 483 | 80 | — |
| MAGNOLIA-MARKRIDGE PARK SUBDIVISION | 468 | 46 | — |
| MAGNOLIA-BEAU PARTERRE | 462 | 36 | — |
| LPWDN HOLIDAY MOBILE ESTATES WS | 426 | 3 | — |
| MAGNOLIA-SHENANDOAH ESTATES | 396 | 44 | — |
| MAGNOLIA-OSSUN HEIGHTS | 393 | 27 | Detected |
| LPWDN SOUTH PARK | 372 | 0 | — |
| LPWDN FAIRWAY VILLAGE WS | 339 | 0 | — |
| BELLE PLACE TRAILER PARK WATER SYSTEM | 330 | 27 | — |
| MAGNOLIA-CARENCRO VILLAGE | 315 | 40 | — |
| MAGNOLIA-COACH HOUSE MANOR | 315 | 38 | — |
| LPWDN GUILLOT VILLAGE | 300 | 2 | — |
| MAGNOLIA-BELLEVILLE SUBDIVISION | 282 | 102 | — |
| MAGNOLIA-SOUTHFIELD SQUARE | 279 | 33 | — |
| MAGNOLIA-GRANDE STAKES | 252 | 32 | — |
| KINGS COURT MHP WATER SYSTEM | 220 | 82 | — |
| WEST GATE TRAILER PARK WATER SYSTEM | 219 | 67 | — |
| MAGNOLIA-CHARTRES PLACE SUBDIVISION | 210 | 30 | — |
| MAGNOLIA-TREWHILL | 207 | 74 | — |
| MAGNOLIA-COTTAGES OF ACADIANA | 196 | 47 | — |
| MAGNOLIA-LEXINGTON HEIGHTS | 192 | 44 | — |
| MAGNOLIA-FOX RUN | 189 | 27 | — |
| LAFAYETTE MHP LLC | 188 | 127 | — |
| G & J MOBILE HOME ESTATES WATER SYSTEM | 186 | 43 | — |
| MAGNOLIA-VILLAGE QUEST SUBDIVISION | 186 | 80 | — |
| G & R MOBILE HOME PARK WATER SYSTEM | 171 | 25 | — |
| CAJUN MOBILE HOME PARK WATER SYSTEM | 168 | 55 | — |