We found 12 public water systems in Jefferson county (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Louisville | County of Jefferson | 3,902 | 0 | 10 |
| WRENS | Wrens | 2,650 | 0 | 6 |
| Wadley | Wadley | 2,500 | 0 | 29 |
| Jefferson County Ws | Louisville | 1,204 | 0 | 0 |
| Stapleton | Stapleton | 350 | 0 | 15 |
| Bartow | Bartow | 280 | 0 | 32 |
| Avera | Avera | 202 | 0 | 5 |
| Grange Road Water System | Louisville | 190 | 0 | 6 |
| J. M. Huber Corp. | County of Jefferson | 150 | 0 | 0 |
| Brown Terrace Subdivision | County of Jefferson | 60 | 0 | 0 |
| Walker Baptist Asso.center | County of Jefferson | 50 | 0 | 0 |
| Southern Natural Gas-wrens | County of Jefferson | 25 | 0 | 0 |