Les Rivières Water Hardness & Quality Report (2026)

Trois-Rivières, Quebec's municipal water utility serves the Les Rivières borough, drawing its supply from the Saint-Maurice River. This vital waterway, spanning over 43,000 square kilometers and draining the Laurentian Plateau into the St. Lawrence River, provides the raw water. Treatment occurs at the city's main drinking water facility, ensuring quality for approximately 140,000 residents across the Mauricie region. Distribution reaches urban and suburban areas through an extensive pipe network.

The geology beneath the Saint-Maurice River watershed is dominated by ancient Precambrian Shield rocks, including granite, gneiss, and mafic intrusions. Paleozoic sedimentary layers are scarce. Glacial deposits further shape the landscape and hydrology. These resistant igneous formations weather very slowly, releasing minimal calcium and magnesium. This geological inertness, combined with precipitation dilution in the forested uplands, results in exceptionally soft water with very low mineral content.

Because the water is very soft, homeowners won't find scale buildup in pipes, kettles, or fixtures, which means less maintenance and longer appliance life. Laundry and dishwashers tend to perform well, and soap will lather efficiently. A water softener isn't necessary, as the water lacks the minerals that cause hardness issues. Instead, residents with older metal plumbing might consider corrosion prevention. The water's pH typically ranges from 7.0 to 7.5, and tests show compliance with lead and copper standards, with PFAS levels below detection.