Pierrefonds-Roxboro Water Hardness & Quality Report (2026)
Water Hardness
Source
river
pH Level
7.3
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
126.3 mg/L
Est. Daily Cost
$0.20
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 Pierrefonds-Roxboro, your appliances are currently losing 10% efficiency due to mineral buildup.
| Appliance | In Pierrefonds-Roxboro | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.2 yrs | 8.5 yrs | -15% |
| Washing Machine | 10.9 yrs | 12 yrs | -9% |
| Water Heater | 12.7 yrs | 15 yrs | -15% |
Regional Water Comparison
How Pierrefonds-Roxboro compares to its nearest neighbours
| City | Hardness | Mineralization | Risk |
|---|---|---|---|
| ▶ Pierrefonds-Roxboro, Quebec | 73.5 mg/L | Medium | 🟡 Moderately Hard |
| Dollard-Des Ormeaux, Quebec | 107.5 mg/L | Medium | 🟡 Moderately Hard |
| L'Île-Bizard–Sainte-Geneviève, Quebec | 98 mg/L | Medium | 🟡 Moderately Hard |
| Kirkland, Quebec | 115.5 mg/L | High | 🟡 Moderately Hard |
| Pointe-Claire, Quebec | 74.5 mg/L | Medium | 🟡 Moderately Hard |
National Benchmark
How Pierrefonds-Roxboro compares to the Canada average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Pierrefonds-Roxboro | 73.5 mg/L | 🟡 Low |
| Canada National Avg | 141 mg/L | 🟠 Moderate |
| Vancouver Top Rated | 3 mg/L | 🟢 None |
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What Makes Pierrefonds-Roxboro's Water Unique?
Local geology and source profile
Pierrefonds-Roxboro (a west-end borough of Ville de Montréal, at the western tip of Montréal island on the Rivière des Prairies) receives its drinking water through Ville de Montréal — Direction de l'eau potable, drawing from both the St. Lawrence River and the Rivière des Prairies via the Atwater, DesBaillets, and Charles-J. Des Baillets water treatment plants. Treatment includes ozonation, biofiltration, UV disinfection, and chloramination, fully meeting the Guidelines for Canadian Drinking Water Quality (GCDWQ). Hardness in this borough is 73.5 mg/L (4.3 gpg) — classified as moderately hard by Health Canada, consistent with the softened west Montréal island distribution zone.
Pierrefonds-Roxboro sits at the western end of Montréal island where both the St. Lawrence and the Rivière des Prairies converge. This favourable position means the supply benefits from significant dilution by Precambrian Shield tributary flows from the Laurentian Highlands via the Rivière des Prairies and Ottawa River systems. The Shield tributary inflow moderates the harder St. Lawrence baseline, producing the 73–74 mg/L characteristic of west Montréal island's distribution zone.
At 73.5 mg/L, Pierrefonds-Roxboro residents experience only light scale deposits in kettles and on tap aerators — descaling every two to three months is adequate. Hot water tanks perform reliably at this hardness. The borough's post-war suburban and newer residential development includes a range of housing ages; Montréal's Direction de l'eau potable advises residents in pre-1970 properties to follow Health Canada lead precautionary guidance and to contact the city about lead service line assessment and replacement.
Geology & Source: Supplied by Ville de Montréal — Direction de l'eau potable from the St. Lawrence River and Rivière des Prairies — Ordovician limestone lowlands river water softened by Precambrian Shield tributary blending reaches this west Montréal island borough at 73.5 mg/L (4.3 gpg).