Tenafly Water Hardness & Quality Report (2026)

Tenafly Borough Water Utility, serving around 15,000 residents in Tenafly, Bergen County, New Jersey, sources its water primarily from the Hackensack River Watershed. Key supply points include the Woodale Reservoir and Lake Tappan Reservoir. Treatment occurs at the Woodale Treatment Plant and DeWolf Road Treatment Plant, where processes like coagulation, sedimentation, filtration, and disinfection ensure the water meets regulatory standards before reaching homes. The watershed itself, a 240-square-mile area in northern New Jersey, receives input from tributaries originating in the Watchung Mountains and the Piedmont Province.

The region's bedrock is characterized by Triassic-age Newark Supergroup sandstones, brownstones, and shales, with additional layers of glacial till and outwash deposits. These ancient geological formations, alongside occasional limestone lenses, naturally contribute dissolved minerals like calcium and magnesium to the water supply. This process results in water that is inherently hard, a characteristic that influences its overall chemical makeup but generally doesn't necessitate extensive softening by the utility itself.

Homeowners in Tenafly often notice the effects of hard water, such as significant scale buildup in appliances like water heaters, dishwashers, and washing machines, which can diminish their efficiency and shorten their lifespan. Common complaints include soap scum residue, spotted dishes after washing, and the feeling of dry skin or hair. For appliances and plumbing, regular descaling with vinegar for items like coffee makers and faucets, along with annual flushing of water heaters, is advised. Many residents find that installing a whole-house water softener is the most effective solution to combat these issues and preserve the longevity of their household equipment.