Saint-Eustache 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
116.9 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 Saint-Eustache, your appliances are currently losing 9% efficiency due to mineral buildup.
| Appliance | In Saint-Eustache | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.3 yrs | 8.5 yrs | -14% |
| Washing Machine | 11 yrs | 12 yrs | -8% |
| Water Heater | 12.8 yrs | 15 yrs | -15% |
Regional Water Comparison
How Saint-Eustache compares to its nearest neighbours
| City | Hardness | Mineralization | Risk |
|---|---|---|---|
| ▶ Saint-Eustache, Quebec | 69.5 mg/L | Medium | 🟡 Moderately Hard |
| Deux-Montagnes, Quebec | 110.5 mg/L | High | 🟡 Moderately Hard |
| Sainte-Marthe-sur-le-Lac, Quebec | 66.5 mg/L | Medium | 🟡 Moderately Hard |
| L'Île-Bizard–Sainte-Geneviève, Quebec | 98 mg/L | Medium | 🟡 Moderately Hard |
| Boisbriand, Quebec | 112.5 mg/L | High | 🟡 Moderately Hard |
National Benchmark
How Saint-Eustache compares to the Canada average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Saint-Eustache | 69.5 mg/L | 🟡 Low |
| Canada National Avg | 141 mg/L | 🟠 Moderate |
| Vancouver Top Rated | 3 mg/L | 🟢 None |
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What Makes Saint-Eustache's Water Unique?
Local geology and source profile
Saint-Eustache's drinking water is managed by Ville de Saint-Eustache, a suburb northwest of Montréal on the north shore of Lac des Deux Montagnes (the widened Ottawa River), drawing from the lake or the Rivière du Chêne via the municipal water treatment plant. Water undergoes coagulation, sedimentation, filtration, UV disinfection, and chloramination, meeting all Guidelines for Canadian Drinking Water Quality (GCDWQ) requirements. Hardness measures 69.5 mg/L (4.1 gpg) — classified as moderately hard by Health Canada, consistent with the broader north-shore Montréal corridor supply zone.
Saint-Eustache's source water from Lac des Deux Montagnes — the broad pool formed by the Ottawa River as it approaches its Montréal confluence — receives water from two major tributaries: the Ottawa River upstream (carrying moderately hard water from the Ordovician limestone Ottawa Valley and Ontario Shield) and the Rivière des Mille Îles system (carrying mixed Shield and Lowlands water). The blend produces the moderate 69.5 mg/L hardness characterising this north-shore supply zone — very close to Blainville (70.5 mg/L) and Saint-Jérôme (73 mg/L) in the same regional watershed corridor.
At 69.5 mg/L, Saint-Eustache residents experience only mild scale deposits in kettles and on tap aerators — descaling every two to three months is adequate. Hot water tanks operate well at this hardness without dedicated scale treatment. Ville de Saint-Eustache publishes annual water quality reports following Ministère de l'Environnement standards, and Health Canada lead precautionary guidance applies to residents in the town's significant stock of pre-1970 heritage and suburban homes along the lake corridor.
Geology & Source: Supplied by Ville de Saint-Eustache from the Rivière des Mille Îles or Rivière du Chêne — water from the Deux Montagnes lake system blending Shield tributary softness with Ordovician limestone Lowlands chemistry produces moderately hard water at 69.5 mg/L (4.1 gpg).