We found 42 public water systems in Williamson county (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Franklin Water Dept | Franklin, Franklin Pike | 68,813 | 33 | 78 |
| Brentwood Water Dept. | Brentwood | 28,950 | 23 | 3 |
| H.b.& T.s. Utility District | Franklin | 24,703 | 30 | 13 |
| Milcrofton Utility District | Franklin | 23,078 | 21 | 6 |
| Nolensville-college Grove Ud | Nolensville | 22,139 | 42 | 17 |
| Mallory Valley Utility District | Franklin | 21,314 | 20 | 5 |
| Fairview Water Department | County of Williamson | 7,432 | 0 | 0 |
| Landings At Brentwood, The | County of Williamson | 2,043 | 0 | 0 |
| WYNDCHASE AT ASPEN GROVE APTS | County of Williamson | 1,574 | 0 | 0 |
| Alara Farms Apartments | County of Williamson | 1,338 | 0 | 0 |
| Franklin Oaks Apartments | County of Williamson | 1,321 | 0 | 0 |
| Alara Brook Apartments | County of Williamson | 1,099 | 0 | 0 |
| Alara At Cool Springs Apts | County of Williamson | 1,090 | 0 | 0 |
| Gateway Village Water System | County of Williamson | 1,055 | 0 | 5 |
| Carrington Hills Apartments | County of Williamson | 1,012 | 0 | 0 |
| South Wind Apartments | County of Williamson | 759 | 0 | 0 |
| Franklin Estates M H Community | County of Williamson | 725 | 0 | 0 |
| College Grove Utility District | Franklin | 718 | 0 | 0 |
| Alara River Oaks Apartments | County of Williamson | 565 | 0 | 0 |
| Camp Marymount | County of Williamson | 250 | 0 | 31 |
| Whippoorwill Farm Day Camp | County of Williamson | 250 | 0 | 0 |
| Mr. B's Farm Kitchen | County of Williamson | 150 | 0 | 0 |
| Kopper Kettle | County of Williamson | 150 | 0 | 0 |
| Holiday Restaurant | County of Williamson | 150 | 0 | 0 |
| Trinity Methodist Church | County of Williamson | 100 | 0 | 0 |
| Peytonsville Church Of Christ | County of Williamson | 100 | 0 | 0 |
| Locust Ridge Baptist Church | County of Williamson | 100 | 0 | 0 |
| Eptworth Baptist Church | County of Williamson | 100 | 0 | 0 |
| Locust Ridge Baptist Church | County of Williamson | 100 | 0 | 0 |
| Trinity Methodist Church | County of Williamson | 80 | 0 | 0 |
| New Hope Church Of Christ | County of Williamson | 65 | 0 | 0 |
| Arrington Baptist Church | County of Williamson | 50 | 0 | 0 |
| Jones Chapel Church Of Christ | County of Williamson | 50 | 0 | 0 |
| Bethesda United Methodist | County of Williamson | 50 | 0 | 0 |
| Tenn Ferrous Castings Inc | County of Williamson | 50 | 0 | 0 |
| Camp Philio | County of Williamson | 50 | 0 | 0 |
| Bethesda United Methodist Ch. | County of Williamson | 50 | 0 | 0 |
| Wesley Chapel Methodist | County of Williamson | 50 | 0 | 0 |
| Pinewood School | County of Williamson | 35 | 0 | 0 |
| Wesley Chapel Methodist | County of Williamson | 30 | 0 | 0 |
| Harris School Of Art | County of Williamson | 25 | 0 | 0 |
| Cool Sprgs Primitive Baptist | County of Williamson | 25 | 0 | 0 |