Tremont Water Hardness & Quality Report (2026)

Tremont, New York, in the Bronx — a central Bronx neighborhood adjacent to East Tremont along Tremont Avenue and the Cross Bronx Expressway corridor — receives its municipal water from the New York City Department of Environmental Protection (NYC DEP), drawing from the Catskill-Delaware Watershed system supplying all five New York City boroughs. Tremont is served through the Bronx distribution network connected to New York City Tunnel No. 1 and the local Bronx pressure zone infrastructure shared with nearby East Tremont and Morrisania.

The moderately hard 153 mg/L hardness and elevated TDS of 372.2 mg/L are well above the typical NYC Catskill-Delaware raw supply baseline (~65–80 mg/L hardness), reflecting the same pattern of distribution system mineral accumulation found throughout the central Bronx neighborhoods. Catskill-Delaware water drains Devonian and Silurian shale, siltstone, and sandstone with essentially no carbonate, producing very soft raw reservoir water. The Tremont distribution zone's elevated hardness readings, intermediate between Morrisania (113.5 mg/L) and East Tremont (177.5 mg/L), reflect complex mineral dynamics in the aging mid-Bronx pipe network — accumulation in century-old mains, pressure zone boundary mixing, and local infrastructure interactions that elevate mineral content above the soft Catskill source.

At 153 mg/L, Tremont's water is moderately hard — noticeably different from the soft water the Catskill supply would indicate. Scale builds in kettles and coffee machines within weeks to months, the dishwasher benefits from rinse aid, and bathroom fixtures develop calcium deposits. Quarterly descaling of heating appliances is appropriate. The PFAS level of 7.3 ppt warrants a certified drinking water filter — the central Bronx's industrial legacy along the Harlem River corridor and the area's urban environmental history contribute to elevated PFAS in the Tremont distribution zone. A certified drinking water filter is strongly recommended.