Candiac Water Hardness & Quality Report (2026)

Candiac's drinking water is managed by Ville de Candiac, drawing from a local Montérégie south shore river or St. Lawrence tributary source — Candiac is a prosperous south shore suburban municipality in the Montérégie directly south of the St. Lawrence from Montreal, one of the Quebec south shore's fastest-growing and highest-income municipalities, known for its high quality of life, low property taxes, and family-oriented community character in the Rive-Sud (south shore) commuter belt. Water undergoes coagulation, sedimentation, filtration, UV disinfection, and chloramination, meeting all Guidelines for Canadian Drinking Water Quality (GCDWQ) requirements. Hardness measures 102 mg/L (6.0 gpg) — classified as moderately hard by Health Canada, consistent with the Montérégie south shore supply corridor.

Candiac's 102 mg/L is in the middle of the Montérégie south shore supply range (84–128 mg/L) — consistent with a south shore supply drawing from the St. Lawrence River or a local tributary crossing the Ordovician and Devonian limestone and dolostone of the St. Lawrence Platform, partially mantled by Champlain Sea marine clay and silty sediment deposits from the post-glacial sea that inundated the St. Lawrence Lowlands. The moderate dissolved calcium and bicarbonate produce the 102 mg/L supply.

At 102 mg/L, Candiac homes experience light to moderate scale deposits — cleaning every two months is adequate. 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 residential properties in the municipality's established older residential areas, though Candiac's significant new construction features modern plumbing throughout.