New Jersey tap water / Water systems

Aqua New Jersey, Hamilton Square system: 2025 water quality report results

In its 2025 water quality report, the Aqua New Jersey, Hamilton Square system reported PFOA at 11 ppt, PFOS at 10.63 ppt and PFNA at 1.65 ppt (highest running annual average). PFOA and PFOS are below New Jersey's limits but above the federal limits; PFNA is below both the New Jersey and federal limits. Lead at the 90th percentile of home taps: <2.0 ppb. Hardness: up to 49 mg/L (soft).

Public water system NJ1103001, operated by Aqua New Jersey. Read the utility's 2025 report; every value below was checked against it. Billing and service questions: Aqua New Jersey customer service.

2025 results against New Jersey and federal limits

Each bar shows the highest running annual average reported for this system, in parts per trillion (ppt), against both limits.

The 2025 report doesn't list arsenic, 1,2,3-trichloropropane or chloride. New Jersey sets its own limits for arsenic (stricter than the federal one) and 1,2,3-trichloropropane (no federal limit); its sodium and chloride limits are recommended upper limits, not enforceable. Federal limits as of November 2026.

According to EPA, lead gets into drinking water when plumbing that contains lead corrodes, and where a home has a lead service line, that pipe is typically the largest source. So a home's own tap can differ from the system-wide 90th percentile.

Other PFAS detected in EPA's nationwide testing (UCMR 5), not charted because the figure isn't a compliance result: PFHpA, PFHxA, PFHxS and PFPeA.

EPA kept its 4 ppt limits for PFOA and PFOS. Utilities must meet them by 2029; EPA has proposed letting systems request until 2031. In May 2026, EPA proposed withdrawing its national limits for PFNA, PFHxS, GenX (HFPO-DA) and a combined limit for PFAS mixtures. The proposal isn't final yet; EPA plans to decide in 2026. New Jersey's own PFNA limit is unaffected. (Status as of November 2026.)

Compare the Aqua NJ, Hamilton Square system with other New Jersey water systems in one table of 2025 PFAS results, or see hardness across the same systems.

Filters certified for PFOA and PFOS

If you want to reduce PFOA and PFOS at home, look for a filter certified to NSF/ANSI Standard 53 or 58 with a PFOA and PFOS reduction claim, and check the claim on the certifier's own listing. Certification shows the filter reduces these chemicals; it doesn't guarantee levels below the federal limit.

We list a filter only when its certification document backs the claim (how we choose products). Replace cartridges on schedule; a used-up filter stops working.

Towns served by the Aqua New Jersey, Hamilton Square system

• Chesterfield tap water (partly served)

Water sources

Water for the Hamilton system, serving Hamilton Township, Washington Township, Chesterfield Township and Upper Freehold Township, comes from five wells in the Potomac-Raritan-Magothy aquifer. The system also interconnects with Trenton Water.