We found 19 public water systems in Jefferson county (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Madison Water Department | Madison | 11,967 | 29 | 36 |
| Kent Water Company | Madison | 5,400 | 0 | 3 |
| Canaan Utilities | Canaan | 4,428 | 0 | 2 |
| Hanover Water Department | Hanover | 2,572 | 0 | 6 |
| Rykers Ridge Water Company | Madison | 2,000 | 0 | 8 |
| Madison State Hospital | Madison | 1,375 | 0 | 45 |
| Hanover College | Hanover | 1,250 | 0 | 4 |
| Madison State Hospital | Madison | 650 | 0 | 0 |
| Indiana-kentucky Electric Corporation | Madison | 320 | 0 | 0 |
| Phillip & John Campbell | Vevay | 272 | 0 | 0 |
| Jefferson Prvng. Grds-in | County of Jefferson | 233 | 0 | 0 |
| Clifty Falls St.pk. Restaurant | Portland | 200 | 0 | 0 |
| Sandy Beach Marina | County of Jefferson | 170 | 0 | 10 |
| Marble Hill Nuclear Plant | New Washington | 125 | 0 | 0 |
| Route 56 Campground | Madison | 100 | 0 | 0 |
| Marble Hill Inn Restaurant | Nabb | 100 | 0 | 0 |
| Sandy Beach Marina | County of Jefferson | 80 | 0 | 0 |
| Sandy Beach Marina | County of Jefferson | 80 | 0 | 0 |
| Kent Water - Hanover College | Hanover | 25 | 0 | 0 |