Mercer County Correctional Center, NJ
Exceeded the action level in the past
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2026-2026). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest result is under the action level, but this system has gone over 15 ppb before. Lead comes from pipes, not the source water, so a home with a lead service line can still be exposed. Test your own tap.
Mercer County Correctional Center at a glance
Mercer County Correctional Center serves about 860 people through 2 service connections, which makes it a small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Mercer County, New Jersey. EPA system ID: NJ1106002; phone on file: 609-532-1572. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Mercer County Correctional Center's lead record
That is down 2 ppb from 2 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Mercer County Correctional Center is 21.7 ppb across 20 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 0 (not detected) |
| 2025 | 2 ppb |
| 2025 | 4.96 ppb |
| 2024 | 4 ppb |
| 2024 | 6.3 ppb |
| 2023 | 6.5 ppb |
| 2023 | 1.57 ppb |
| 2022 | 0.91 ppb |
| 2022 | 0.65 ppb |
| 2021 | 9.53 ppb |
| 2021 | 7.79 ppb |
| 2020 | 1.91 ppb |
| 2020 | 8.48 ppb |
| 2019 | 11.1 ppb over 10 |
| 2019 | 1.3 ppb |
| 2018 | 12.3 ppb over 10 |
| 2018 | 1.6 ppb |
| 2017 | 2.7 ppb |
| 2017 | 14.5 ppb over 10 |
| 2016 | 21.7 ppb over 15 |
Where this result ranks
Of the 605 New Jersey systems with a lead result, the median latest reading is 1 ppb; 5 are over 15 ppb right now and 52 have gone over at some point. Mercer County Correctional Center's reported as 0 (not detected) sits at the 22nd percentile in New Jersey and the 26th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in Mercer County
10 other systems share Mercer County; 5 of them have a higher latest lead result than Mercer County Correctional Center. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Trenton Water Works | 217,000 | 6 ppb |
| Aqua Nj - Hamilton Square | 39,128 | 0 (not detected) |
| East Windsor Mua | 25,000 | 1.61 ppb |
| Aqua Nj - Lawrence | 8,655 | 0 (not detected) |
| Hightstown Water Department | 5,400 | 0.57 ppb |
| Pennington W Dept | 2,600 | 1 ppb |
| Hopewell Boro W Dept | 2,035 | 0 (not detected) |
| Lawrenceville School | 1,200 | 0 (not detected) |
| Washington Crossing Park Estates | 356 | 1.4 ppb |
| Robbinsville Twp - Newtown Village | 300 | 0 (not detected) |
Next steps for Lambertville, NJ
Test your own tap with a certified lab first-draw sample; Lambertville, NJ may offer free or low-cost kits through the utility. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Mercer County Correctional Center whether it covers that cost before hiring anyone - many utilities now do.
These figures describe homes the utility sampled, not your tap. Only your service line record or a test of your own water answers the question for your house. What a 90th-percentile result does and does not tell you: how to read a lead result. More in what a past exceedance means today.