Troy Water Hardness & Quality Report (2026)

Troy, New York, the Rensselaer County seat on the Hudson River — a major Hudson Valley industrial city (the 'Collar City,' historically the largest producer of shirts, collars, and cuffs in the United States), home of Rensselaer Polytechnic Institute (RPI — one of the oldest engineering universities in the English-speaking world, founded 1824), and a diverse city known for its Irish-American heritage and Victorian architecture — draws its municipal water supply from the Tomhannock Reservoir (Hudson River watershed) via the Troy Water and Sewer Department. Water hardness in Troy measures 160.5 mg/L — classified as hard.

Troy's hard supply reflects the upper Hudson Valley watershed's calcareous terrain. The Tomhannock Reservoir watershed drains: the Taconic Mountains crystalline schist and phyllite (calcareous-moderate Taconic thrust belt — some calcareous contribution from calcareous schist and phyllite of the Taconic Sequence); the Ordovician Normanskill Formation (calcareous black shale — Hudson Valley calcareous shale); and the Upper Hudson River Valley Cambrian–Ordovician calcareous formations (Potsdam Sandstone calcareous cement and the Beekmantown Group dolomite). The Hudson Valley calcareous Paleozoic terrain combined with Troy's aged urban distribution infrastructure (a 19th century industrial city with cast-iron mains from the Victorian industrial era) produces the hard 160.5 mg/L.

At 160.5 mg/L, Troy residents face regular hard water challenges. Scale deposits form on faucet aerators, showerheads, and appliances within weeks — monthly descaling with citric acid solution is standard maintenance. Troy Water and Sewer Department consistently delivers water meeting all New York State DOH and EPA Safe Drinking Water Act requirements.