Maplewood Water Hardness & Quality Report (2026)

Maplewood, New Jersey, in Essex County just west of Newark, receives its municipal water from New Jersey American Water, drawing from the South Mountain Reservation watershed impoundments and the broader Wanaque Supply System and Raritan Basin reservoirs managed by the New Jersey Water Supply Authority. Maplewood's proximity to the Watchung Mountain ridges and the South Mountain Reservation — Essex County's largest nature preserve — places it within the service area drawing the softest water sources in northern New Jersey, treated at regional facilities before distribution through Essex County's dense suburban grid.

The very soft 47.5 mg/L hardness reflects the geology of Maplewood's source watersheds. The South Mountain Reservation watershed drains Precambrian gneisses and schists of the New Jersey Highlands, while the Watchung Ridges — prominent topographic features east of Maplewood — consist of Triassic diabase and basalt (the First and Second Watchung Mountains). Both lithologies are siliceous or mafic volcanic rocks with minimal soluble carbonate content. Rainwater and snowmelt running off these formations produces naturally soft, low-mineral water before reservoir collection.

At 47.5 mg/L, Maplewood has very soft water — a notable advantage in the northern New Jersey urban corridor. Soap and shampoo lather exceptionally well, appliances accumulate essentially no scale under normal use, and glassware from the dishwasher emerges spotless. Kettles and water heaters remain clean for years without maintenance. The main consideration with this very soft supply is its mild corrosive tendency — residents in pre-1986 homes should flush cold taps for 30 seconds before drinking and test for lead from legacy plumbing. The PFAS level of 5.6 ppt is moderate for northern New Jersey — a certified filter is advisable for daily drinking water.