Lead pipes in Mercer County, New Jersey
How many lead pipes are in Mercer County, NJ?
Water systems based in Mercer County reported 15,781 lead service lines, 659 galvanized lines that need replacing and 23,537 lines of unknown material to EPA (Q3 2026). Trenton has the most, with 16,180 lead and galvanized lines.
Free replacement program confirmed
Who pays in New Jersey
New Jersey requires water systems to replace all lead service lines, and galvanized lines that need it, within ten years of the 2021 law, so by 2031. Investor-owned utilities recover the cost of the owner side through rates; New Jersey American Water and Veolia replace customer lines at no direct cost and add a small charge to every bill. Many municipal systems, such as Newark, Trenton and Passaic Valley, also replace at no cost to the owner.
Confirmed programs in Mercer County
- Trenton: Free and mandatory.
Every Mercer County water system with lead lines
Systems are grouped by the county EPA lists as their main service area. Some serve towns in neighboring counties too.
| Water system | Lead | Galv. | Unknown | Program |
|---|---|---|---|---|
| Trenton Trenton Water Works | 15,734 | 446 | 23,000 | Free replacement |
| Pennington Pennington W Dept | 0 | 154 | 0 | Not confirmed |
| Hopewell Hopewell Boro W Dept | 46 | 0 | 3 | Not confirmed |
| Lawrence Aqua NJ - Lawrence | 0 | 38 | 16 | Not confirmed |
| Hamilton Square Aqua NJ - Hamilton Square | 1 | 21 | 518 | Not confirmed |
Common questions
How many lead pipes are in Mercer County, NJ?
Water systems based in Mercer County reported 15,781 lead service lines, 659 galvanized lines that need replacing and 23,537 lines of unknown material to EPA (Q3 2026). Trenton has the most, with 16,180 lead and galvanized lines.
Who pays to replace lead service lines in Mercer County?
It depends on your water utility. New Jersey requires water systems to replace all lead service lines, and galvanized lines that need it, within ten years of the 2021 law, so by 2031. We have confirmed programs for 1 Mercer County utility, listed on this page.
How do I find out if my house has a lead service line?
Look up your address on your water utility's service line inventory map, or check the pipe where it enters your home: lead is dull gray, soft, scratches to shiny silver, and a magnet won't stick. See our step-by-step guide.
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