County drinking water records
Williamson County, TN drinking water systems
9 community water systems serve Williamson County, TN, reporting 381,409 people served in all. A system that also serves other counties counts all of its customers here.
1 of them had at least one health-based violation in the last 10 years. 4 systems still have one unresolved.
9 rely mainly on surface water, counting water bought from other systems.
Their lead service line inventories list no lead lines, no galvanized lines that must be replaced and no lines of unknown material.
- Community water systems
- 9
- People served, sum of each system's own figure
- 381,409
- Systems with a health-based violation, last 10 years
- 1
- Systems with one unresolved
- 4
- Lead service lines in inventories
- 0
Water systems serving Williamson County
9 systemsPeople served is each system's own figure for its whole service area. Violation counts cover the last 10 years of EPA records.
| System | Serves | People served | Main source | Health-based violations, 10 years | Unresolved | Lead lines |
|---|---|---|---|---|---|---|
| Franklin Water Dept | Franklin, Thompson's Station and 1 more and land outside them | 77,222 | Surface water | 7 | 1 | 0 |
| Spring Hill Water Dept | Spring Hill | 65,840 | Surface water | 0 | 0 | 0 |
| Harpeth Valley U.D. | Nashville and Brentwood | 65,518 | Surface water | 0 | 1 | 0 |
| H.B.& T.S. Utility District | Thompson's Station and Spring Hill and land outside them | 40,094 | Purchased surface water | 0 | 1 | 0 |
| Milcrofton Utility District | Franklin and land outside it | 38,032 | Purchased surface water | 0 | 0 | 0 |
| Nolensville-College Grove U.D. | Brentwood and Nolensville and land outside them | 32,793 | Purchased surface water | 0 | 0 | 0 |
| Brentwood Water Department | Brentwood | 30,493 | Purchased surface water | 0 | 0 | 0 |
| Mallory Valley U.D. | Franklin and Brentwood | 30,347 | Purchased surface water | 0 | 0 | 0 |
| Gateway Utility Company, Inc. | Franklin | 1,070 | Purchased surface water | 0 | 1 | 0 |
Cities and towns in Williamson County
4 places- Brentwood4 systems
- Franklin4 systems
- Nolensville1 system
- Thompson's Station2 systems
Counties come from the counties EPA lists each system serving, matched to 2024 Census counties; where EPA lists none, from the county coded in the system's ID, its service area map, or its mailing address. A county holding at least a fifth of a system's service area map is added when at least a fifth of that map lies in those counties. Towns are the ones EPA lists and the Census places such a map covers, always inside those counties. In New England, where EPA's town names a whole Town, it is not matched to the village of the same name. A system is not listed in a county holding less than a fifth of its map, or in a county or town its map reaches when the map lies mostly outside the counties EPA lists, so a page can leave out a system that serves part of the area. Methodology and limitations