Saint-Laurent Water Hardness & Quality Report (2026)
Water Hardness
~120–179 mg/L
Hardestimated · not lab-verified
Source
river
pH Level
7.7
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
229.3 mg/L
Est. Daily Cost
$0.40
energy & soap waste
Source: Health Canada Water Quality · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In Saint-Laurent, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Saint-Laurent | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.8 yrs | 8.5 yrs | -20% |
| Washing Machine | 9.6 yrs | 12 yrs | -20% |
| Water Heater | 12 yrs | 15 yrs | -20% |
Regional Water Comparison
How Saint-Laurent compares to its nearest neighbours
| City | Hardness | Mineralization | Risk |
|---|---|---|---|
| ▶ Saint-Laurent, Quebec | ≈ 120–179 mg/L | High | 🟠 Hard |
| Mont-Royal, Quebec | ≈ 60–120 mg/L | Medium | 🟡 Moderately Hard |
| Côte-Saint-Luc, Quebec | 119.5 mg/L | Medium | 🟡 Moderately Hard |
| Snowdon, Quebec | ≈ 60–120 mg/L | Medium | 🟡 Moderately Hard |
| Parc-Extension, Quebec | ≈ 60–120 mg/L | Medium | 🟡 Moderately Hard |
National Benchmark
How Saint-Laurent compares to the Canada average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Saint-Laurent | ≈ 120–179 mg/L | 🟠 Moderate |
| Canada National Avg | 140 mg/L | 🟠 Moderate |
| Vancouver Top Rated | 3 mg/L | 🟢 None |
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What Makes Saint-Laurent's Water Unique?
Local geology and source profile
Ville de Montréal provides drinking water to Saint-Laurent, a borough of the city. The supply originates from the St. Lawrence River, with water drawn through two primary intakes. The Atwater treatment plant handles the western sector, including Saint-Laurent, while the Charles-J.-Des Baillets plant serves a wider area. These advanced facilities employ coagulation, flocculation, sedimentation, and filtration to treat the river water. Their extensive distribution networks, monitored annually, deliver safe drinking water to over a million residents across Montreal Island. The St. Lawrence River watershed itself collects drainage from upstream tributaries and the Laurentian Plateau.
Geologically, the region is characterized by Ordovician limestone and dolomite formations belonging to the St. Lawrence Platform. These underlying carbonate rocks are the primary reason for the water's mineral content. As water flows over and through these bedrock layers, it dissolves minerals like calcium and magnesium. Glacial till and marine sediments also cover these formations, further influencing the water's composition. This geology results in a water supply that is notably hard, reflecting the dissolution of minerals from the carbonate bedrock.
Homeowners will likely notice the effects of this hard water on their appliances and plumbing. Expect scale buildup in pipes, water heaters, dishwashers, and washing machines, which can decrease efficiency and shorten their lifespan. Soap may not lather as effectively, leading to soap scum in showers, and laundry might appear less bright. Heating elements and fixtures are particularly susceptible to damage from mineral deposits. Regular maintenance, such as flushing and deliming, is a good idea. To significantly reduce these issues and protect your home's systems, installing a water softener is highly recommended. Ville de Montréal's annual reports confirm that the water meets Health Canada guidelines, with a pH typically between 7.5 and 8.0 for corrosion control.
Geology & Source: St. Lawrence River watershed; Ordovician limestones and dolomites from the St. Lawrence Platform create hard water.
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