County drinking water records
Mercer County, NJ drinking water systems
10 community water systems serve Mercer County, NJ, reporting 302,234 people served in all. A system that also serves other counties counts all of its customers here.
4 of them (40%) had at least one health-based violation in the last 10 years. 7 systems still have one unresolved.
6 rely mainly on groundwater and 4 on surface water, counting water bought from other systems.
Their lead service line inventories list 15,785 lead lines, 887 galvanized lines that must be replaced and 24,370 lines of unknown material.
1 more system is placed in Mercer County, NJ by the county its records name because it has no service area map that lines up with its own records, so it is listed apart and not counted here.
- Community water systems
- 10
- People served, sum of each system's own figure
- 302,234
- Systems with a health-based violation, last 10 years
- 4
- Systems with one unresolved
- 7
- Lead service lines in inventories
- 15,785
Water systems serving Mercer County
10 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 |
|---|---|---|---|---|---|---|
| Trenton Water Works | Trenton, Mercerville and 4 more and land outside them | 217,000 | Surface water | 20 | 0 | 15,734 |
| Aqua NJ - Hamilton Square | Hamilton Square, Mercerville and 3 more and land outside them | 39,128 | Purchased surface water | 0 | 2 | 2 |
| East Windsor MUA | Twin Rivers and land outside it | 25,000 | Groundwater | 1 | 0 | 0 |
| Aqua NJ - Lawrence | Lawrenceville and land outside it | 8,655 | Groundwater under direct influence | 0 | 1 | 0 |
| Hightstown Water Department | Hightstown | 5,400 | Groundwater | 0 | 0 | 0 |
| Pennington W Dept | Pennington | 2,600 | Groundwater | 0 | 3 | 0 |
| Hopewell Boro W Dept | Hopewell | 2,035 | Purchased surface water | 2 | 1 | 49 |
| Lawrenceville School | Outside cities and towns | 1,200 | Groundwater | 0 | 1 | 0 |
| Mercer County Correctional Center | Outside cities and towns | 860 | Groundwater | 3 | 2 | 0 |
| Washington Crossing Park Estates | Outside cities and towns | 356 | Groundwater | 0 | 4 | 0 |
Systems placed by county record in Mercer County
1 systemEPA has no service area map for this system. It is placed by the county its records name (the counties EPA lists it serving, or the county coded in its ID where EPA lists none), and without a map it is not counted in the figures above.
| System | Serves | People served | Main source | Health-based violations, 10 years | Unresolved | Lead lines |
|---|---|---|---|---|---|---|
| Robbinsville Twp - Newtown Village | County on record | 300 | Purchased surface water | 0 | 0 | 0 |
Cities and towns in Mercer County
14 places- Groveville2 systems
- Hamilton Square1 system
- Hightstown1 system
- Hopewell1 system
- Lawrenceville1 system
- Mercerville2 systems
- Pennington1 system
- Robbinsville Center1 system
- The College of New Jersey1 system
- Trenton1 system
- Twin Rivers1 system
- White Horse1 system
- Windsor1 system
- Yardville1 system
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