Hamilton Square Water Hardness & Quality Report (2026)

Hamilton Square, New Jersey, in Mercer County — a Mercer County unincorporated community adjacent to Hamilton and Trenton in central New Jersey — receives its water from the New Jersey American Water, drawing from the D&R Canal or Delaware River (Mercer County) through the central New Jersey distribution.

The soft 77 mg/L hardness and TDS of 141.6 mg/L reflect the central New Jersey Mercer County Delaware River supply's soft character — the Precambrian Kittatinny Highlands and Triassic Newark Basin contribute moderate insoluble dilution and slight calcareous input, consistent with the central New Jersey Delaware River communities (compare Hanover NJ: 78.5 mg/L on the Rockaway-Morris County supply; Hamilton Square comparable softness). The Delaware River at Mercer County — Precambrian Kittatinny Highlands (insoluble — primary dilutant), Triassic Newark Basin (slightly calcareous — hardness contributor), and Quaternary Delaware River alluvium (slightly calcareous — minor TDS).

At 77 mg/L, Hamilton Square's water is soft — scale forms very slowly in appliances, dishwashers remain efficient, and no softening is needed. Annual descaling is appropriate. The PFAS level of 7.3 ppt warrants a certified drinking water filter — the Mercer County central New Jersey industrial and former military corridor contribute to Hamilton Square's elevated PFAS readings.