Linden Water Hardness & Quality Report (2026)

Linden, New Jersey, in Union County — a major Union County industrial and refinery community in the New York Harbor–Newark Bay area (home of numerous petroleum refineries and chemical plants in the north New Jersey Chemical Coast), a diverse Union County community with significant Latin American, Haitian-American, and Eastern European heritage, and a dense industrial waterfront community in the northeast New Jersey Newark Bay corridor — draws its municipal water supply from the Rahway River and NJ American Water system via the City of Linden Water Division. Water hardness in Linden measures 177.5 mg/L — classified as hard.

Linden's hard supply reflects the Union County northeast New Jersey industrial corridor's calcareous geology and infrastructure. The Rahway River and NJ American Water supply draws from the Passaic River watershed (New Jersey Highlands Precambrian calcareous-moderate granitic gneiss and Triassic Newark Basin calcareous arkosic sandstone and shale). Linden's distribution infrastructure — including older Union County industrial waterfront mains from the early-to-mid 20th century industrial buildout era — accumulates substantial additional mineral content, producing the hard 177.5 mg/L.

At 177.5 mg/L, Linden residents face regular hard water challenges. Monthly descaling with citric acid solution is standard maintenance. City of Linden Water Division consistently delivers water meeting all New Jersey DEP and EPA Safe Drinking Water Act requirements.