County · New Jersey
Mercer County, New Jersey: drinking water records
This overview covers 22 ZIP codes and 11 community water systems in Mercer County. It also stands in for 0 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Trenton Water Works NJ1111001 | 217,000 | 120 | 0 | 20 | 6 ppb |
| East Windsor MUA NJ1101002 | 25,000 | 240 | 0 | 1 | 1.6 ppb |
| Aqua Nj - Hamilton Square NJ1103001 | 39,128 | 270 | 6 | 0 | 0 ppb |
| Aqua Nj - Lawrence NJ1107002 | 8,655 | 120 | 6 | 0 | 0 ppb |
| Hightstown Water Department NJ1104001 | 5,400 | 60 | 0 | 0 | 1.7 ppb |
| Hopewell Boro W Dept NJ1105001 | 2,035 | 0 | 0 | 2 | 0 ppb |
| Mercer County Correctional Center NJ1106002 | 860 | 0 | 0 | 3 | 0 ppb |
| Pennington W Dept NJ1108001 | 2,600 | 0 | 0 | 0 | 1 ppb |
| Lawrenceville School NJ1107001 | 1,200 | 0 | 0 | 0 | 0 ppb |
| Washington Crossing Park Estates NJ1106001 | 356 | 0 | 0 | 0 | 1.4 ppb |
| Robbinsville TWP - Newtown Village NJ1112001 | 300 | 0 | 0 | 0 | 0 ppb |
ZIP reports in Mercer County
No ZIP report in this county is published yet.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.