Patchogue Water Hardness & Quality Report (2026)

Patchogue, New York, in Suffolk County — a Suffolk County village adjacent to Medford and Brookhaven on the south shore of Long Island — receives its water from the Suffolk County Water Authority, drawing from the Long Island aquifer (Suffolk County) through the south-central Long Island distribution.

The hard 138.5 mg/L hardness and TDS of 314.5 mg/L reflect the south-central Long Island Suffolk County aquifer supply's moderate calcareous character — the Pleistocene Ronkonkoma Aquifer slightly calcareous glacial sands produce moderate water, with TDS elevated by the coastal position and marine intrusion risk typical of south Long Island communities (compare Wawarsing NY: 70.5/169 in Ulster County on the Catskill Aqueduct far softer; Patchogue harder from the coastal Long Island glacial aquifer). The Long Island aquifer at Suffolk County — Pleistocene Ronkonkoma Aquifer (slightly calcareous — primary hardness contributor), Miocene Gardiners Clay (insoluble — dilutant), and Holocene coastal marine contact (chloride — TDS contributor).

At 138.5 mg/L with TDS 315, Patchogue's water is hard — scale builds in kettles and appliances over months, dishwashers benefit from rinse aid, and faucet aerators need periodic cleaning. Quarterly descaling is appropriate. The PFAS level of 6.6 ppt warrants a certified drinking water filter — the Suffolk County Long Island industrial and military corridor contribute to Patchogue's elevated readings.