Deux-Montagnes Water Hardness & Quality Report (2026)
Water Hardness
~60–119 mg/L
Moderately Hardestimated · not lab-verified
Source
river
pH Level
7.5
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
177.6 mg/L
Est. Daily Cost
$0.24
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 Deux-Montagnes, your appliances are currently losing 12% efficiency due to mineral buildup.
| Appliance | In Deux-Montagnes | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.5 yrs | 8.5 yrs | -12% |
| Washing Machine | 10.6 yrs | 12 yrs | -12% |
| Water Heater | 13.2 yrs | 15 yrs | -12% |
Regional Water Comparison
How Deux-Montagnes compares to its nearest neighbours
| City | Hardness | Mineralization | Risk |
|---|---|---|---|
| ▶ Deux-Montagnes, Quebec | ≈ 60–119 mg/L | Medium | 🟡 Moderately Hard |
| Saint-Eustache, Quebec | 22 mg/L | Low | 🟢 Soft |
| Sainte-Marthe-sur-le-Lac, Quebec | ≈ 120–179 mg/L | Medium | 🟠 Hard |
| L'Île-Bizard–Sainte-Geneviève, Quebec | ≈ 60–120 mg/L | Medium | 🟡 Moderately Hard |
| Pierrefonds-Roxboro, Quebec | ≈ 60–120 mg/L | Medium | 🟡 Moderately Hard |
National Benchmark
How Deux-Montagnes compares to the Canada average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Deux-Montagnes | ≈ 60–119 mg/L | 🟡 Low |
| Canada National Avg | 140 mg/L | 🟠 Moderate |
| Vancouver Top Rated | 3 mg/L | 🟢 None |
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What Makes Deux-Montagnes's Water Unique?
Local geology and source profile
The municipal water for Deux-Montagnes, Quebec, is supplied by the Ville de Deux-Montagnes, serving about 18,000 people in the Laurentides region. The source is the Lake of Two Mountains, a section of the Ottawa River. Water is drawn from the lake and treated at the local water treatment plant. There, it undergoes standard processes like filtration and disinfection before entering the municipal distribution system. This system delivers water to the city's core and nearby areas within the Deux-Montagnes MRC.
The Lake of Two Mountains is part of the Ottawa River watershed, sitting at the edge of the Canadian Shield and the St. Lawrence Platform. The bedrock here consists of Ordovician limestone and dolomite from the Beekmantown Group, with some influence from older Precambrian granite further upstream. Layers of glacial deposits and clay from ancient seas cover the surface, affecting how water moves through the area. As water flows over these rocks, it picks up minerals like calcium and magnesium, a common characteristic of rivers in areas with limestone.
This moderately hard water can lead to limescale buildup in appliances such as kettles, water heaters, and dishwashers, which can lower their efficiency and increase energy bills. You might notice soap scum in showers, leaving skin and hair feeling dry, and laundry may require extra detergent. Regularly descaling fixtures with vinegar can help, but installing a water softener is often recommended to prolong the life of your appliances and improve cleaning. The treated water typically has a pH between 7.5 and 8.5, which is alkaline.
Geology & Source: Ordovician limestones and dolomites; carbonate-rich bedrock dissolves calcium and magnesium, producing moderate hardness
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