Saint-Léonard Water Hardness & Quality Report (2026)
Water Hardness
Source
river
pH Level
7.4
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
145.7 mg/L
Est. Daily Cost
$0.21
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-Léonard, your appliances are currently losing 11% efficiency due to mineral buildup.
| Appliance | In Saint-Léonard | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7 yrs | 8.5 yrs | -18% |
| Washing Machine | 10.6 yrs | 12 yrs | -12% |
| Water Heater | 12.4 yrs | 15 yrs | -17% |
Regional Water Comparison
How Saint-Léonard compares to its nearest neighbours
| City | Hardness | Mineralization | Risk |
|---|---|---|---|
| ▶ Saint-Léonard, Quebec | 80 mg/L | Medium | 🟡 Moderately Hard |
| Villeray–Saint-Michel–Parc-Extension, Quebec | 72.5 mg/L | Medium | 🟡 Moderately Hard |
| Saint-Michel, Quebec | 85 mg/L | Medium | 🟡 Moderately Hard |
| Montréal-Nord, Quebec | 71.5 mg/L | Medium | 🟡 Moderately Hard |
| Mercier–Hochelaga-Maisonneuve, Quebec | 72 mg/L | Medium | 🟡 Moderately Hard |
National Benchmark
How Saint-Léonard compares to the Canada average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Saint-Léonard | 80 mg/L | 🟡 Low |
| Canada National Avg | 141 mg/L | 🟠 Moderate |
| Vancouver Top Rated | 3 mg/L | 🟢 None |
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What Makes Saint-Léonard's Water Unique?
Local geology and source profile
Saint-Léonard (a north-central borough of Ville de Montréal, historically home to a large Italian-Canadian community) receives its drinking water through Ville de Montréal — Direction de l'eau potable, part of Montréal's integrated 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 distribution zone is 80 mg/L (4.7 gpg) — classified as moderately hard by Health Canada.
Saint-Léonard sits in Montréal's north-central area and is supplied from the distribution zone blending St. Lawrence River and Rivière des Prairies treatment plant output. The moderate 80 mg/L hardness reflects the balanced mix of harder Ordovician limestone-influenced St. Lawrence mainstream water and softer Precambrian Shield tributary water from the Rivière des Prairies corridor that characterises the Montréal island distribution network. Saint-Léonard's position slightly further inland on the island results in a hardness near the upper range of Montréal's north-side borough distribution zones.
At 80 mg/L, Saint-Léonard residents experience moderate scale deposits in kettles and on tap aerators — descaling every two to three months is typically adequate. Hot water tanks perform reliably at this hardness without dedicated treatment. For Saint-Léonard's significant stock of multi-unit residential buildings and bungalows from the 1950s to 1970s, Montréal's Direction de l'eau potable strongly advises residents to follow Health Canada precautionary lead guidance and to check lead service line status with the city's active lead pipe replacement programme.
Geology & Source: Supplied by Ville de Montréal — Direction de l'eau potable from the St. Lawrence River — Ordovician limestone lowlands river water softened by Precambrian Shield tributary blending reaches this north-central Montréal borough at 80 mg/L (4.7 gpg).