| Mineral Springs Water System | Dubach, LA | 900 | 6 | - |
| Mt Olive Waterworks District | Grambling, LA | 900 | 13 | - |
| Hammock Water Supply | Gilbert, LA | 900 | 411 | - |
| Atlanta Water Supply | Winnfield, LA | 900 | 324 | - |
| Arby's | Covington, LA | 900 | 20 | - |
| Villages of Bocage- Madisonville | Madisonville, LA | 894 | 18 | - |
| Village of Estherwood Water System | Estherwood, LA | 891 | 45 | - |
| Lisbon Water System | Lisbon, LA | 891 | 27 | - |
| Mayfield Elementary School | Covington, LA | 890 | 7 | - |
| East Central Bossier Water System | Benton, LA | 885 | 169 | - |
| Pointe a la Hache Water System | Belle Chasse, LA | 882 | 246 | - |
| Bistineau Water System | Heflin, LA | 882 | 25 | - |
| Cameron Parish Ww District 9 | Grand Chenier, LA | 871 | 292 | Clean |
| Madisonville Water Supply | Madisonville, LA | 871 | 8 | - |
| Graphic Packaging International Inc - A | West Monroe, LA | 850 | 11 | - |
| Graphic Packaging International Inc - B | West Monroe, LA | 850 | 10 | - |
| Ward IV Water District | Oakdale, LA | 840 | 6 | - |
| Lake Ramsey | Covington, LA | 840 | 125 | - |
| Varnado Water Works - Pine | Angie, LA | 840 | 13 | Clean |
| Pleasant Hills-Crossroads Water Systems | Joyce, LA | 840 | 916 | - |
| Magnolia-Jackson Square | Des Peres, LA | 825 | 64 | - |
| Magnolia-Money Hills Estates | Des Peres, LA | 825 | 18 | - |
| Magnolia-River Park | Des Peres, LA | 822 | 0 | - |
| Marathon Petroleum Company LLC | Garyville, LA | 817 | 73 | - |
| Village of Morse Water System | Morse, LA | 806 | 43 | - |
| Creston Water System | Campti, LA | 801 | 63 | - |
| Spring Bayou Water Works District | Marksville, LA | 795 | 34 | - |
| Fellowship Water System | Simsboro, LA | 795 | 32 | - |
| Town of Tullos Water System | Tullos, LA | 792 | 626 | - |
| Magnolia-Western Utilities, Inc | Des Peres, LA | 789 | 66 | - |
| Ebarb Wwks Dist # 1 - N Ebarb/Belmont | Zwolle, LA | 789 | 328 | - |
| Waterproof Water System | Waterproof, LA | 786 | 521 | - |
| Town of Urania Water System | Urania, LA | 784 | 31 | - |
| Cotton Plant Water System | Grayson, LA | 783 | 87 | - |
| Backwood Village Water System | Saline, LA | 783 | 377 | - |
| Village of Mermentau Water System | Mermentau, LA | 780 | 66 | - |
| Ebenezer Water System | Chatham, LA | 780 | 82 | - |
| Morehouse Central WS | Collinston, LA | 780 | 79 | - |
| Friendship Water System | Saline, LA | 777 | 307 | - |
| Vixen Water System | Alexandria, LA | 774 | 1,090 | - |
| Phillips 66 Lake Charles Refinery | Westlake, LA | 770 | 53 | - |
| Tickfaw Water System | Tickfaw, LA | 764 | 22 | - |
| Hall Summit Water System | Hall Summit, LA | 756 | 44 | - |
| Salem Water System | Farmerville, LA | 753 | 707 | - |
| Pitkin Water System | Pitkin, LA | 750 | 43 | - |
| Shell Chemical Company | Geismar, LA | 750 | 63 | - |
| Sunny Times 4 LLC | Lacombe, LA | 750 | 7 | - |
| Lakeshore High School | Covington, LA | 750 | 4 | - |
| Village of Tangipahoa Water System | Tangipahoa, LA | 748 | 183 | - |
| Village of Wilson Water System | Wilson, LA | 744 | 50 | - |