Kingston Water Hardness & Quality Report (2026)

Kingston, New York, in Ulster County on the western bank of the Hudson River — New York State's first capital, a historic city with a preserved Stockade District dating to 1658 and an arts community revitalized around the Kingston Arts District — receives its municipal water from the City of Kingston Water Division, drawing from local reservoir impoundments in the Catskill Mountain foothills of Ulster County. Kingston's water supply comes from reservoirs on tributaries of the upper Rondout Creek and Esopus Creek drainages, distinct from the NYC DEP Catskill system reservoirs upstream.

The moderately hard 162 mg/L hardness and TDS of 408.9 mg/L are notably harder than the NYC Catskill-Delaware supply (64–75 mg/L) that residents of the Bronx and Manhattan receive, reflecting Kingston's reservoir watershed's geological transition zone character. Kingston's reservoirs sit in the Ulster County Catskill fringe where the characteristic Devonian Catskill Formation siliciclastic rocks (sandstones, shales) transition toward the older Silurian Rondout Formation dolomite and Ordovician Helderberg Limestone and Manlius Formation carbonates of the underlying stratigraphic sequence exposed in the mid-Hudson Valley region. These limestone and dolomite formations contribute calcium and magnesium to watershed drainage, producing a moderately hard supply quite different from the ultra-soft deep Catskill reservoir water.

At 162 mg/L, Kingston residents deal with moderately hard water from their local Catskill fringe reservoirs. Scale forms in kettles and appliances over months, the dishwasher benefits from rinse aid, and bathroom surfaces develop calcium deposits. Quarterly descaling of heating appliances is the standard schedule. The PFAS level of 7.8 ppt warrants a certified drinking water filter — the mid-Hudson Valley's light industrial history and the Hudson River corridor's chemical manufacturing legacy contribute to PFAS levels in regional water supplies.