Teaneck Water Hardness & Quality Report (2026)

Teaneck, New Jersey, in Bergen County — a diverse and historically significant Bergen County suburban community, one of the first communities in the United States to voluntarily desegregate its public schools (Teaneck voluntarily desegregated its schools by federal court order in 1965 — the first community in the country to do so voluntarily), a major Orthodox Jewish and Modern Orthodox Jewish community, a diverse multi-racial and multi-ethnic community with significant African-American, Korean-American, and Iranian-American populations, and a major northeastern Bergen County community on the Hackensack River — draws its municipal water supply from Oradell Reservoir via Suez Water New Jersey. Water hardness in Teaneck measures 154 mg/L — classified as hard.

Teaneck's moderate-to-hard supply reflects the Bergen County Hackensack River watershed's calcareous geology and the Suez Water New Jersey treatment characteristics. The Oradell Reservoir on the Hackensack River drains: the New York–New Jersey Highlands (Precambrian calcareous-poor gneiss — the Ramapo and Bearfort Highland crystalline terrain); and the New Jersey Piedmont Newark Basin (Triassic–Jurassic Brunswick Formation — calcareous-moderate red arkose and mudstone of the rift basin). Suez Water NJ applies moderate treatment, producing the moderate 154 mg/L at Teaneck.

At 154 mg/L, Teaneck residents face moderate-to-hard scale challenges. Monthly descaling with citric acid solution is recommended. Suez Water New Jersey consistently delivers water meeting all New Jersey DEP and EPA Safe Drinking Water Act requirements.