Mercier–Hochelaga-Maisonneuve 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
123.6 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 Mercier–Hochelaga-Maisonneuve, your appliances are currently losing 10% efficiency due to mineral buildup.
| Appliance | In Mercier–Hochelaga-Maisonneuve | 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 Mercier–Hochelaga-Maisonneuve compares to its nearest neighbours
| City | Hardness | Mineralization | Risk |
|---|---|---|---|
| ▶ Mercier–Hochelaga-Maisonneuve, Quebec | 72 mg/L | Medium | 🟡 Moderately Hard |
| Saint-Léonard, Quebec | 80 mg/L | Medium | 🟡 Moderately Hard |
| Le Vieux-Longueuil, Quebec | 73 mg/L | Medium | 🟡 Moderately Hard |
| Le Plateau-Mont-Royal, Quebec | 73 mg/L | Medium | 🟡 Moderately Hard |
| Villeray–Saint-Michel–Parc-Extension, Quebec | 72.5 mg/L | Medium | 🟡 Moderately Hard |
National Benchmark
How Mercier–Hochelaga-Maisonneuve compares to the Canada average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Mercier–Hochelaga-Maisonneuve | 72 mg/L | 🟡 Low |
| Canada National Avg | 141 mg/L | 🟠 Moderate |
| Vancouver Top Rated | 3 mg/L | 🟢 None |
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What Makes Mercier–Hochelaga-Maisonneuve's Water Unique?
Local geology and source profile
Mercier–Hochelaga-Maisonneuve receives its drinking water through Ville de Montréal — Direction de l'eau potable, part of Montréal's integrated municipal water network drawing from the St. Lawrence River and Rivière des Prairies via the Atwater, DesBaillets, and Charles-J. Des Baillets water treatment plants. Water is treated with ozonation, biofiltration, UV disinfection, and chloramination, meeting all Guidelines for Canadian Drinking Water Quality (GCDWQ) standards. Hardness in this east Montréal borough's distribution zone is 72 mg/L (4.2 gpg) — classified as moderately hard by Health Canada, comparable to other Montréal boroughs served from the same softened distribution network.
Mercier–Hochelaga-Maisonneuve is served from a distribution zone within Montréal's integrated network where the blend of St. Lawrence and Rivière des Prairies supply — the latter carrying softer water from Precambrian Shield tributaries of the Laurentian Highlands — reduces hardness below the 116 mg/L measured at the primary St. Lawrence intakes. The east borough's supply reflects this diluted blend, producing the 72 mg/L characteristic of Montréal's north-facing distribution zones.
At 72 mg/L, Mercier–Hochelaga-Maisonneuve residents see only light scale deposits on kettle elements and tap aerators — descaling two to three times a year is adequate for most households. Hot water tanks operate at good efficiency at this hardness without dedicated descaling treatment. As with all Montréal boroughs, the Direction de l'eau potable advises residents in older pre-1970 housing — common in this historic east end neighbourhood — to follow Health Canada precautionary guidance on lead and to participate in the city's ongoing lead service line replacement programme.
Geology & Source: Supplied by Ville de Montréal — Direction de l'eau potable from the St. Lawrence River via the Atwater and DesBaillets treatment plants — Ordovician limestone lowlands water softened by Precambrian Shield tributary dilution reaches this east Montréal borough at 72 mg/L (4.2 gpg).