Magog Water Hardness & Quality Report (2026)

The municipal water for Magog, Quebec, is supplied by the Ville de Magog utility. Its primary source is Lake Memphremagog, a vast reservoir situated within the Memphrémagog Regional County Municipality. Water is drawn from the lake and undergoes treatment at a local purification facility before being distributed to homes, businesses, and institutions throughout the city and surrounding areas. The Lake Memphremagog watershed extends across the Quebec-New York border, characterized by forested hills and agricultural land. This region sits within the Appalachian geological province, where underlying sedimentary rocks, including limestones and dolostones from the Ordovician and Silurian periods, play a significant role in shaping the water's mineral content through natural dissolution processes.

The bedrock beneath Magog is primarily composed of Ordovician and Silurian sedimentary rocks, notably limestones and dolostones. These carbonate-rich layers are part of the Appalachian geological formations. As water interacts with these rocks, it dissolves minerals like calcium and magnesium. This natural leaching process, occurring in both the surface waters of Lake Memphremagog and potentially in fractured bedrock, contributes to the water's moderately mineralised and moderately hard character. The geology is typical for the Eastern Townships region, where limestone dissolution is a common factor influencing water chemistry.

Homeowners in Magog may notice moderate scale buildup in appliances such as pipes, water heaters, and dishwashers, which can decrease their efficiency and leave spots on glassware. You might also find that laundry feels stiffer, and soaps and detergents are less effective, requiring you to use more product. To combat these effects and help extend the lifespan of your appliances, consider an annual descaling of fixtures and appliances. For persistent issues, a water softener is often recommended. While specific data on contaminants like lead is limited, regional school testing has shown compliance with Health Canada's limits. Lake Memphremagog monitoring focuses on ecological health indicators rather than direct drinking water contaminants.