Duvernay Water Hardness & Quality Report (2026)

Duvernay (a residential borough sector of Ville de Laval in the east-central part of the island, bordering the Rivière des Prairies at the Montréal boundary) receives its drinking water from Ville de Laval, drawing from the Rivière des Prairies via the Laval Water Treatment Plant. Water undergoes coagulation, sedimentation, filtration, UV disinfection, and chloramination, fully meeting the Guidelines for Canadian Drinking Water Quality (GCDWQ). Hardness in Duvernay's distribution sub-zone is 65.5 mg/L (3.8 gpg) — classified as moderately hard by Health Canada, at the softer end of the Laval distribution spectrum.

Duvernay's supply from the Rivière des Prairies reflects a distribution sub-zone receiving water from the section of the river most influenced by the Rivière des Mille Îles and upstream soft Laurentian Shield tributary dilution. Within Laval's unified water system, sub-zones vary from 65.5 mg/L (Duvernay) to 101 mg/L (Val-des-Arbres) depending on the specific distribution pathway and the balance of soft Shield inflow vs. harder Ordovician limestone Lowlands river chemistry at the point of extraction and distribution.

At 65.5 mg/L, Duvernay residents experience only mild scale deposits in kettles and on tap aerators — occasional descaling every two to three months is adequate. Hot water tanks operate reliably at this hardness without dedicated treatment. Ville de Laval provides annual water quality reports following Ministère de l'Environnement standards, and Health Canada lead precautionary guidance applies to residents in the borough's mix of post-war suburban and more recent residential developments along the Laval north shore.