Massena Water Hardness & Quality Report (2026)

Massena, New York, in St. Lawrence County — a St. Lawrence County town adjacent to Ogdensburg and Canton on the St. Lawrence River at the New York-Canada border — receives its water from the Village of Massena Water Department, drawing from the St. Lawrence River through the north New York distribution.

The hard 167 mg/L hardness and TDS of 432.2 mg/L reflect the St. Lawrence County supply's hard calcareous character — the Ordovician Black River Limestone is a highly calcareous formation in the St. Lawrence Lowland, while the Cambrian Potsdam Sandstone provides insoluble dilution from the Canadian Shield headwaters; Massena's supply is harder than typical Adirondack communities due to the St. Lawrence River's limestone drainage influence (compare Ogdensburg NY: 162/420 in St. Lawrence County comparable; Canton NY: 171/444 in St. Lawrence County comparable; Massena consistent hard from the same St. Lawrence County St. Lawrence River Ordovician calcareous supply). The St. Lawrence River — Ordovician Black River Limestone (highly calcareous — primary hardness contributor), Cambrian Potsdam Sandstone (insoluble — primary dilutant), and Quaternary St. Lawrence alluvium (calcareous — TDS contributor).

At 167 mg/L with TDS 432, Massena's water is hard — scale builds in appliances. Quarterly descaling is appropriate. The PFAS level of 8.0 ppt warrants a certified drinking water filter. Review the Village of Massena's annual water quality report.