New Rochelle Water Hardness & Quality Report (2026)

New Rochelle Water Company, operated under United Water New York (now part of Suez), serves the city of New Rochelle in Westchester County, New York, with a population of approximately 80,000. The utility draws its entire supply from the New York City water system via two connections: Shaft 22 of the Delaware Aqueduct in Yonkers, blending Catskill and Delaware watershed waters, and Rye Lake in the eastern portion of Kensico Reservoir in Harrison, primarily Delaware watershed water. No local treatment plants are used; water is distributed directly from these NYC system interconnections. A smaller segment may be served by Westchester County WD #3, covering 6,000 people.

The Catskill and Delaware watersheds span the Catskill Mountains and Delaware River basin in upstate New York — protected forested areas managed by the New York City Department of Environmental Protection. Geologically, they feature Paleozoic-era sedimentary rocks, including Devonian-age shales, sandstones, and carbonate formations that weather to release minerals into surface runoff. Kensico Reservoir integrates these inputs, shaping a moderately mineralised water chemistry influenced by limestone dissolution and cation exchange in watershed soils. Natural bicarbonate buffering imparts a moderately hard character to the supply, distinguishing it from softer glacial or rainwater-dominated sources.

At moderately hard levels, New Rochelle's water promotes limescale buildup in kettles, dishwashers, and water heaters, reducing efficiency by 20–30% over time and increasing energy costs. Laundry may feel stiffer, and soap lathering is less effective. Coffee makers and showerheads are most affected, with mineral deposits clogging nozzles. Regular vinegar descaling every 3–6 months is advised; a water softener is recommended for households to extend appliance life and improve skin and hair condition. Water quality testing by Westchester County WD #3 shows 1–2 contaminants above EPA MCLGs, including arsenic from natural bedrock sources within legal MCLs, with PFAS concerns prompting filter recommendations for vulnerable groups.