New York Tap Water Quality
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Overview
New York City's Catskill/Delaware supply is the largest unfiltered system on earth, protected by a watershed program so effective the EPA waives filtration for 8.5 million people, and the water routinely wins taste awards. Upstate cities run conventional systems on lakes and rivers.
Outside the city, the record is more mixed: Hoosick Falls' PFOA crisis (2014-2016) made the state an early PFAS regulator, Newburgh's supply was contaminated by Stewart Air Base foam, and Long Island's sole-source aquifer carries 1,4-dioxane and PFAS from decades of industry, driving the nation's most extensive treatment build-out there.
Common Contaminants in New York
Hoosick Falls and Newburgh became national cases; state limits (10 ppt) preceded federal rules and Long Island systems installed dozens of treatment units
Long Island's signature contaminant from industrial solvents; New York set the nation's first enforceable limit and AOP treatment is being installed across Nassau/Suffolk
Older upstate cities (Buffalo, Syracuse, Albany) carry legacy service lines with replacement programs accelerating
Violations & Compliance
NYC's system is consistently compliant with a filtration waiver held since 1993 (UV disinfection added). Long Island's treatment retrofit and small upstate systems account for most active compliance work.
Water Hardness in New York
Soft, typically 20–100 mg/L. New York City's Catskill/Delaware supply is famously soft (around 20-40 mg/L); western New York systems on Great Lakes water or limestone groundwater run moderate to hard.
Hardness affects taste, limescale, and soap — not safety. Compare levels across all cities or read the water hardness guide.
City Water Reports in New York
Frequently Asked Questions
Sources & References
The safety rating and guidance on this page draw on the following sources. See our full methodology.
- •US EPA Safe Drinking Water Act regulations
- •EWG Tap Water Database
- •The utility's most recent Consumer Confidence Report (CCR)
- •WHO Guidelines for Drinking-water Quality