Mercer County, NJ Water Quality Guide

Mercer County includes Trenton's municipal utility, which also serves several surrounding townships, plus other systems and private wells.

About Mercer County, NJ Water

Mercer County is served by multiple public water systems, utilities, and report records. The provider and contaminant information below is organized by PWS ID rather than treated as one countywide water result.

Municipality-level mapping: Pending verified NJDEP or utility service-area records for the current inventory.

Utility and water-quality data

Water system providers for Mercer County, NJ

This county page lists PWS systems represented in the current NJ source inventory. A county is not one water system; confirm the PWS ID on your bill or through NJDEP.

Data disclosure: Municipality-to-PWS relationships below are based on NJDEP municipal-boundary and public-community service-area GIS intersections. A mapped relationship does not guarantee service at every address.

Utility providers and PWS IDs

PWS ID	System	Provider	County	Status	Official links
`NJ1103001`	Hamilton	Aqua New Jersey, Inc.	Mercer County	verified-current	Utility/source links CCR/report finder
`NJ1107002`	Lawrenceville Water Company	Aqua New Jersey, Inc.	Mercer County	verified-current	Utility/source links CCR/report finder

Municipality pages with available report data

East Windsor — 1 report-linked PWS system
Hamilton — 2 report-linked PWS systems
Hopewell — 1 report-linked PWS system
Hopewell — 2 report-linked PWS systems
Lawrence — 2 report-linked PWS systems
Princeton — 1 report-linked PWS system
Robbinsville — 2 report-linked PWS systems
West Windsor — 2 report-linked PWS systems

Reported contaminant levels for Mercer County, NJ

PWS ID	System	Contaminant	Reported level	Range	Limit	Comparison	Sample year	Source

All available reports

NJ1103001 Hamilton — Official CCR/report finder
NJ1107002 Lawrenceville Water Company — Official CCR/report finder

How to read this info

How to Read This Info for Mercer County, NJ

Start with the provider table and PWS ID. Compare the reported contaminant level and unit with the listed MCL, recommended upper limit, or action level. “Below / At / Above” is a direct comparison, not a formal compliance determination.

For address confirmation, use the NJDEP Drinking Water Viewer, EPA ECHO, and the official CCR links shown above.

FAQ

Frequently asked questions

Who is my water provider and source in Mercer County?

Review the listed PWS IDs and providers above:

NJ1103001 — Aqua New Jersey, Inc.
NJ1107002 — Aqua New Jersey, Inc.

Confirm the PWS ID on your bill or with NJDEP because counties are not single water systems.

Does Mercer County have specific water quality issues?

Review the contaminant rows and official CCR sources above. Do not treat one system’s report as a countywide result.

NJ Water Quality is an independent educational resource. County and PWS mappings are discovery records and may not establish service at every address. Blank, dated, or limited data are disclosed above.

Last reviewed: July 13, 2026