Greenpoint Water Hardness & Quality Report (2026)

Greenpoint, Brooklyn, New York — a historic north Brooklyn neighborhood in Kings County (Greenpoint is the northernmost neighborhood in Brooklyn — a historically Polish-American neighborhood, still home to one of the largest Polish-American communities in the United States, with a significant Polish-language commercial district on Manhattan Avenue), adjacent to the East River waterfront and Long Island City (Queens), home of a major oil spill remediation site (Greenpoint is the site of one of the largest underground petroleum spills in US history — the Greenpoint oil spill, estimated at 17–30 million gallons beneath the neighborhood from decades of Mobil and ExxonMobil operations), a rapidly gentrifying Brooklyn neighborhood with a significant artist and young professional population, and a diverse Kings County community with Polish, Hispanic-American, and Brazilian-American communities — draws its municipal water supply via the NYC DEP. Water hardness in Greenpoint measures 94 mg/L — classified as moderately soft.

Greenpoint's moderate softness reflects the NYC Catskill–Delaware system's calcareous-poor watershed and the Brooklyn distribution characteristics. The Catskill and Delaware Reservoirs drain: the Devonian Catskill Formation (calcareous-poor clastic sandstone and shale of the Catskill Mountains); the Devonian Hamilton Group (calcareous-poor shale). NYC DEP distributes through the north Brooklyn Greenpoint zone, producing the moderate 94 mg/L.

With hardness at 94 mg/L, Greenpoint residents enjoy moderately soft water. NYC DEP consistently delivers water meeting all New York State DEC and EPA Safe Drinking Water Act requirements.