Tarrytown Water Hardness & Quality Report (2026)

The Village of Tarrytown's water supply serves about 11,000 residents in Westchester County, New York. Its primary source is the New York City Catskill and Delaware Aqueduct Systems, drawing unfiltered water directly south of the NYC UV treatment plant near Shaft-18 and Kensico Reservoir. This water undergoes ultraviolet disinfection, chlorination, and fluoride addition by NYC before reaching Tarrytown. In emergencies, water can be supplied from the Croton watershed. Residents can contact the Village of Tarrytown utility at 914-631-1785.

The Catskill and Delaware watersheds, located east of the Hudson River in the Catskill Mountains and Delaware River basin, form the main supply. These regions are primarily underlain by Devonian Catskill Formation shales, sandstones, and siltstones, remnants of ancient deltaic deposits. Unlike areas with limestone or dolomite, this bedrock contains minimal soluble carbonates. The Croton watershed, used as a backup, features similar Paleozoic sedimentary and metamorphic rocks, also low in reactive minerals. This geological makeup results in very soft water with low dissolved mineral content.

Because Tarrytown's water is soft, homeowners are unlikely to encounter significant scale buildup in pipes, water heaters, or appliances, which typically extends the life of these systems and reduces maintenance. You'll find that soaps and detergents lather easily, meaning you can use less product for effective cleaning. Laundry will feel softer, too, without the stiffness that hard water can cause. A water softener isn't recommended; in fact, over-softening might be detrimental. Be mindful of potential corrosion in older plumbing due to the low mineral buffering, and a simple sediment filter can improve clarity if desired. The 2024 Annual Water Quality Report indicates compliance with all State drinking water health standards.