Verdun Water Hardness & Quality Report (2026)

Service de l'eau de la Ville de Montréal supplies Verdun, Quebec, drawing water from the St. Lawrence River. The Atwater and Charles-J.-Des Baillets treatment plants handle the raw river water. Des Baillets, situated near Verdun, employs screening, coagulation, flocculation, sedimentation, filtration, and disinfection. This process serves over 1.1 million residents across Montreal's island network, including Verdun's roughly 70,000 people. The St. Lawrence River watershed, influenced by the Great Lakes-St. Lawrence basin and the Ottawa River confluence, provides the raw supply.

Underlying the river valley are Paleozoic limestone and dolomite formations from the Beekmantown and Chazy groups, along with metamorphic rocks of the Grenville Province. These carbonate bedrock layers release calcium and magnesium into the surface water, resulting in a moderately mineralized profile. Sediments from the Champlain Sea and deposits from glacial till further contribute to the dissolved mineral content, shaping the water's chemical makeup without reliance on groundwater aquifers.

This moderately hard water can lead to limescale buildup in appliances like kettles and water heaters, potentially reducing their lifespan by 20-30% if left untreated. You might notice reduced flow in faucets and showerheads due to deposits, and you'll likely need more detergent for effective cleaning in laundry and dishwashing. Some residents report drier skin and hair after showering. Regularly descaling with vinegar can help manage scale, but a water softener is often recommended for households experiencing spots on glassware or soap scum, particularly in older homes with galvanized pipes. Montreal's treated water meets Health Canada guidelines, with recent reports showing no PFAS exceedances and excellent compliance for lead and copper.