Laval Water Hardness & Quality Report (2026)

Ville de Laval supplies drinking water to the municipality of Laval, Quebec, drawing from the Rivière des Prairies and the St. Lawrence River. While specific treatment plant and reservoir names were not identified, the utility maintains a drinking water testing and quality assurance program. Laval is situated within the Greater Montreal region, and its water undergoes regular testing to ensure compliance with provincial and federal drinking water standards. Residents can find detailed results on the Ville de Laval environment and water department website.

The municipality's water originates from the Ordovician limestone Lowlands and the St. Lawrence valley sedimentary formation. This geological setting contributes to Laval's water supply exhibiting moderately hard characteristics, with a reported hardness of 6.9 grains per gallon (gpg). While Quebec is generally known for softer water due to its geology, Laval's specific location results in a measurable level of mineral content.

At this moderately hard level, homeowners might observe some mineral buildup on faucets and appliances over time, although it's generally less pronounced than in truly hard-water regions. You may notice modest scale accumulation in water heaters and dishwashers. While a water softener is a good idea for many households, it's not strictly necessary; regular descaling can often manage the effects. You'll also find that soap and detergents work slightly less efficiently than they would with soft water.