Saguenay Water Hardness & Quality Report (2026)

Saguenay's drinking water is managed by Ville de Saguenay, drawing from Lac Kenogami (serving the Jonquière and Chicoutimi sectors) and the Rivière Chicoutimi and Rivière aux Sables catchments on the Laurentian Plateau. Treatment is provided at several municipal water treatment plants using coagulation, sedimentation, filtration, UV disinfection, and chloramination, fully complying with the Guidelines for Canadian Drinking Water Quality (GCDWQ). Hardness is just 12 mg/L (0.7 gpg) — classified as soft by Health Canada, among the softest urban municipal water supplies in Canada.

Saguenay sits at the edge of the Lac-Saint-Jean lowland where the Saguenay River cuts deeply through the Laurentian Highlands — an ancient Precambrian Shield landscape of granite, gneiss, and anorthosite forming part of the Grenville Province. These ancient crystalline metamorphic rocks are highly resistant to chemical weathering, yielding virtually no calcium or magnesium to percolating precipitation. The reservoir basins supplying Saguenay's water drain entirely over impermeable Precambrian bedrock, with no carbonate geology present to introduce mineral hardness into the supply.

With just 12 mg/L of hardness, Saguenay homes are essentially free of scale build-up — kettles, taps, and appliances can go months or even years without descaling treatment. Hot water tanks last significantly longer than in harder-water cities, and soap and detergent consumption is markedly lower. However, Saguenay's very soft water is slightly acidic and corrosive — older homes with copper plumbing or lead-solder joints should be tested for trace metals at the tap. Ville de Saguenay adds lime and phosphate inhibitors to reduce pipe corrosivity; older properties benefit from point-of-use filtration.