Le Plateau-Mont-Royal 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
125.3 mg/L
Est. Daily Cost
$0.19
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 Le Plateau-Mont-Royal, your appliances are currently losing 10% efficiency due to mineral buildup.
| Appliance | In Le Plateau-Mont-Royal | 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 Le Plateau-Mont-Royal compares to its nearest neighbours
| City | Hardness | Mineralization | Risk |
|---|---|---|---|
| ▶ Le Plateau-Mont-Royal, Quebec | 73 mg/L | Medium | 🟡 Moderately Hard |
| Mile End, Quebec | 98.5 mg/L | Medium | 🟡 Moderately Hard |
| Milton-Parc, Quebec | 99 mg/L | Medium | 🟡 Moderately Hard |
| Montréal, Quebec | 116 mg/L | Medium | 🟡 Moderately Hard |
| Rosemont–La Petite-Patrie, Quebec | 73 mg/L | Medium | 🟡 Moderately Hard |
National Benchmark
How Le Plateau-Mont-Royal compares to the Canada average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Le Plateau-Mont-Royal | 73 mg/L | 🟡 Low |
| Canada National Avg | 141 mg/L | 🟠 Moderate |
| Vancouver Top Rated | 3 mg/L | 🟢 None |
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What Makes Le Plateau-Mont-Royal's Water Unique?
Local geology and source profile
Le Plateau-Mont-Royal receives its drinking water through Ville de Montréal — Direction de l'eau potable, part of Montréal's integrated municipal water system drawing from the St. Lawrence River and 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 iconic central borough is 73 mg/L (4.3 gpg) — classified as moderately hard by Health Canada, consistent with the softer Montréal distribution zones north of the St. Lawrence.
Le Plateau-Mont-Royal's supply is drawn from a distribution zone receiving a blend of St. Lawrence and Rivière des Prairies treatment plant output — with the Shield-influenced Rivière des Prairies intake contributing softer Laurentian Highland water that dilutes the harder Ordovician limestone-influenced St. Lawrence baseline. The Rivière des Prairies catchment includes numerous tributaries draining the Precambrian Shield of the Laurentides, producing the softened 73 mg/L supply characteristic of this north-central Montréal distribution zone.
At 73 mg/L, Le Plateau residents experience only light scale deposits in kettles and on tap aerators — descaling two to three times a year is adequate. Hot water tanks perform well at this hardness without scale treatment. As Montréal's most densely populated and urbanistically vibrant borough — with a mix of triplex and plex housing from the late 19th and early 20th centuries — residents are advised by Montréal's Direction de l'eau potable to follow Health Canada lead precautionary guidance and enquire about lead service line status, as older plumbing is common throughout the neighbourhood.
Geology & Source: Supplied by Ville de Montréal — Direction de l'eau potable from the St. Lawrence River and Rivière des Prairies — Shield-diluted Ordovician limestone lowlands supply reaches this iconic central Montréal borough at 73 mg/L (4.3 gpg).