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Laval draws its water from the Rivière des Prairies and the Rivière des Mille Îles and treats it at three plants. In 2025, treated water averaged 51 mg/L at Chomedey, 50 mg/L at Pont-Viau and 61 mg/L at Sainte-Rose. That is soft water, with Sainte-Rose just over the 60 mg/L line into moderately hard. In Laval, odours and residue are a bigger worry than scale.
Data last reviewed October 17, 2026.
In other units
Source: Ville de Laval, 2025 average drinking water results (PDF, in French). Data for: 2025, treated water average. Checked October 13, 2026.
In other units
Source: Ville de Laval, 2025 average drinking water results (PDF, in French). Data for: 2025, treated water average. Checked October 13, 2026.
In other units
Source: Ville de Laval, 2025 average drinking water results (PDF, in French). Data for: 2025, treated water average. Checked October 13, 2026.
Scale builds slowly with soft water. Odours, grease and detergent residue are the bigger issue, so clean the dishwasher and the washer about every two weeks.
Dissolves grease, detergent residue and limescale buildup, and removes odour-causing buildup.
Clears grease, limescale and odour buildup
Breaks down residue and odour-causing buildup inside your washer.
Removes odour and buildup from the drum and hoses
We use the U.S. Geological Survey scale, in mg/L as CaCO₃.
Utilities usually report hardness in mg/L as calcium carbonate (CaCO₃), which is the same as ppm. Dishwasher and softener manuals often use grains per gallon or German degrees instead. Here is how they convert:
No. In 2025, Laval's treated water averaged 51 mg/L at Chomedey and 50 mg/L at Pont-Viau, which is soft, and 61 mg/L at Sainte-Rose, just into moderately hard.
Less often than in harder-water cities. Scale builds slowly with soft water. Grease, detergent residue and odours build up in dishwashers and washers whatever your water, so cleaning the dishwasher and the washer about every two weeks still makes sense.
Chomedey plant: 3.0 grains per US gallon, or 3.6 grains per imperial gallon. Pont-Viau plant: 2.9 grains per US gallon, or 3.5 grains per imperial gallon. Sainte-Rose plant: 3.6 grains per US gallon, or 4.3 grains per imperial gallon.
Ville de Laval, 2025 average drinking water results (PDF, in French). Data for 2025, treated water average. We update this page when a new report comes out.
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