Queens Water Hardness & Quality Report (2026)

Queens is served by the New York City Department of Environmental Protection (NYC DEP), which supplies all five boroughs from the same integrated reservoir network. The dominant supply comes from the Catskill–Delaware watershed system — the Catskill System's Schoharie and Ashokan reservoirs and the Delaware System's Pepacton, Cannonsville, Neversink, and Rondout reservoirs — all gravity-fed from the Catskill Mountains approximately 125 miles north of New York City. A smaller supplemental portion comes from the Croton System in Westchester and Putnam counties during high-demand periods.

Queens tap water registers at 36 mg/L — the same very soft classification as the rest of the New York City system. The geology of the Catskill and Delaware watersheds — dominated by Devonian shale, siltstone, and Precambrian gneiss — releases almost no dissolved calcium or magnesium. The Croton Reservoir water, while slightly harder due to calcareous bedrock in its catchment, constitutes a small enough fraction that the blended municipal supply remains firmly in the soft range throughout Queens' distribution network.

At 36 mg/L, Queens water produces excellent soap and shampoo lather, causes negligible limescale buildup on appliances, and extends the service life of water-using equipment well above national averages. Residents making coffee, tea, or cooking with NYC tap water benefit from the same mineral-neutral softness that makes the city's water a favourite among culinary professionals and specialty roasters.