Saint-Basile-le-Grand Water Hardness & Quality Report (2026)

Saint-Basile-le-Grand's drinking water is managed by Ville de Saint-Basile-le-Grand, drawing from a local Montérégie east river or reservoir source — a growing suburban municipality in the eastern Montérégie between Longueuil and Saint-Hyacinthe, on the north edge of the Richelieu–Yamaska corridor, known for the catastrophic 1988 PCB warehouse fire that led to the mass evacuation of residents and became a defining moment in Quebec's environmental history, now a popular family suburb east of Montreal with rapid residential growth. Water undergoes coagulation, sedimentation, filtration, UV disinfection, and chloramination, meeting all Guidelines for Canadian Drinking Water Quality (GCDWQ) requirements. Hardness measures 117.5 mg/L (6.9 gpg) — classified as moderately hard by Health Canada (just below the 120 mg/L hard threshold), reflecting the eastern Montérégie supply character.

Saint-Basile-le-Grand's 117.5 mg/L is consistent with the eastern Montérégie sub-zone between the Longueuil Richelieu valley (90.5–100 mg/L) and the harder Sainte-Catherine zone (128 mg/L). The watershed here draws through the Ordovician and Cambrian Appalachian lowlands of the eastern Montérégie at the Richelieu–Yamaska interfluve, where moderate carbonate dissolution from the Brome–Missisquoi Appalachian transition terrain produces the moderately hard 117.5 mg/L supply.

At 117.5 mg/L, Saint-Basile-le-Grand homes experience moderate scale deposits — cleaning every two months is advisable. Hot water tanks have a reliable operational lifespan. Water quality reports are published following Ministère de l'Environnement standards. Health Canada lead precautionary guidance applies to pre-1975 properties in the historic village core of this rapidly growing suburban municipality.