Chomedey Water Hardness & Quality Report (2026)

Chomedey, a district within the City of Laval in Quebec, Canada, receives its drinking water from the municipal utility operated by Ville de Laval. The supply originates from the St. Lawrence River, treated at the Saint-Rose drinking water treatment plant serving over 400,000 residents across Laval. The watershed is the vast St. Lawrence River basin, spanning Quebec and Ontario, with local intake near the river's broad estuary. This integrated system draws directly from the river, a significant surface water source for the region.

Underlying geology consists of Ordovician-age carbonate platforms like the Beekmantown and Chazy groups, dolomitic limestones that dissolve to impart minerals. This sedimentary sequence shapes a moderately mineralised character, as bicarbonate hardness develops from natural rock-water interactions without deep aquifer buffering. The regional geology features the Appalachian fold belt to the south and Precambrian Shield to the north, with the river picking up hardness minerals from glacial till and bedrock dissolution over its course.

At moderately hard levels, scale buildup occurs on faucets, showerheads, and inside water heaters, reducing efficiency by up to 20-30%. Dishwashers and laundry machines suffer from spotting and detergent inefficiency. Maintenance includes monthly vinegar descaling for fixtures, annual heater flushing, and using rinse aids. A water softener is recommended for households noticing soap scum or dry skin to extend appliance life. Laval's water maintains pH around 7.5-8.0 post-treatment. 2022 reports noted exceedances in turbidity and lead, linked to distribution pipes, though copper complies.