We found 28 public water systems that could serve the same population as Union Parish Waterworks District 1 (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Farmerville Water System | County of Union Parish | 4,977 | 0 | 22 |
| Darbonne Ws North | County of Union Parish | 3,186 | 0 | 19 |
| Darbonne Ws South | County of Union Parish | 3,054 | 0 | 31 |
| Bernice Water System | County of Union Parish | 2,199 | 0 | 7 |
| Point Wilhite Ws | County of Union Parish | 1,950 | 0 | 60 |
| Darbonne Water System Inc | County of Union Parish | 1,950 | 0 | 0 |
| Holmesville Water System | County of Union Parish | 1,845 | 0 | 56 |
| Linville-haile Water System | County of Union Parish | 1,635 | 0 | 62 |
| Rocky Branch Water System | County of Union Parish | 1,410 | 0 | 25 |
| Sardis Water System | County of Union Parish | 1,404 | 0 | 63 |
| Wards Chapel Water System | County of Union Parish | 1,350 | 0 | 47 |
| Tri-water System | County of Union Parish | 1,245 | 0 | 32 |
| Marion Water System | County of Union Parish | 1,146 | 0 | 73 |
| West Sterlington Water System | County of Union Parish | 978 | 0 | 10 |
| Junction City Water System | County of Union Parish | 810 | 0 | 7 |
| Salem Water System | County of Union Parish | 753 | 0 | 66 |
| Camp T.l. James W.s. | County of Union Parish | 700 | 0 | 0 |
| Concord Water System | County of Union Parish | 426 | 0 | 81 |
| Litroe Water System | County of Union Parish | 369 | 0 | 83 |
| Union Parish School Board | County of Union Parish | 350 | 0 | 0 |
| Corney Water System | County of Union Parish | 237 | 0 | 6 |
| Randolph Water System | County of Union Parish | 222 | 0 | 30 |
| Downsville Water System | County of Union Parish | 216 | 0 | 50 |
| 550-15 Subdivision W.s. | County of Union Parish | 75 | 0 | 0 |
| Cox Ferry Water System | County of Union Parish | 51 | 0 | 0 |
| Lakeside Terrace W. Sys. | County of Union Parish | 40 | 0 | 0 |
| Riverwood Chip Mill | County of Union Parish | 30 | 0 | 0 |
| Riverwood Chip Mill | County of Union Parish | 12 | 0 | 0 |