Saint-Louis-de-Terrebonne 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
0.002 mg/L
✓ Below action level
TDS
292.4 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-Louis-de-Terrebonne, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Saint-Louis-de-Terrebonne | 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-Louis-de-Terrebonne compares to its nearest neighbours
| City | Hardness | Mineralization | Risk |
|---|---|---|---|
| ▶ Saint-Louis-de-Terrebonne, Quebec | ≈ 120–179 mg/L | High | 🟠 Hard |
| Sainte-Anne-des-Plaines, Quebec | ≈ 180+ mg/L | Very High | 🔴 Very Hard |
| Rosemère, Quebec | ≈ 0–60 mg/L | Low | 🟢 Soft |
| Sainte-Thérèse, Quebec | ≈ 180+ mg/L | Very High | 🔴 Very Hard |
| Boisbriand, Quebec | ≈ 0–60 mg/L | Medium | 🟢 Soft |
National Benchmark
How Saint-Louis-de-Terrebonne compares to the Canada average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Saint-Louis-de-Terrebonne | ≈ 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-Louis-de-Terrebonne's Water Unique?
Local geology and source profile
Ville de Terrebonne draws its water from the Rivière des Mille-Îles. This river acts as a conduit, carrying a mix of flow from the Ottawa River, which is softened by the Canadian Shield's geology, and water influenced by Ordovician limestone. The water then undergoes treatment at a local facility before being distributed to residents. This source provides a consistent supply, though specific treatment plant details were not available.
Water flowing through the Laurentian lowland channel is shaped by its geological underpinnings. The presence of Ordovician limestone contributes minerals that increase water hardness. Additionally, the influence of the Ottawa River, itself a product of the Canadian Shield's geology, adds to the water's characteristics. This blend results in water that is considered moderately hard, measuring approximately 4.6 grains per gallon (gpg).
Homeowners in Saint-Louis-de-Terrebonne may notice the effects of this moderately hard water on their appliances and plumbing. Over time, mineral buildup can lead to scale formation, particularly in water heaters and dishwashers, potentially reducing their efficiency and lifespan. Using less soap and detergent is often a benefit of moderately hard water, but for optimal appliance performance and to combat scale, a water softener might be a worthwhile consideration.
Geology & Source: Laurentian lowland channel; Ordovician limestone and Ottawa River influence produce moderate hardness (4.6 gpg)
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