Le Vieux-Longueuil 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
125.5 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 Vieux-Longueuil, your appliances are currently losing 10% efficiency due to mineral buildup.
| Appliance | In Le Vieux-Longueuil | 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 Vieux-Longueuil compares to its nearest neighbours
| City | Hardness | Mineralization | Risk |
|---|---|---|---|
| ▶ Le Vieux-Longueuil, Quebec | 73 mg/L | Medium | 🟡 Moderately Hard |
| Longueuil, Quebec | 115 mg/L | Medium | 🟡 Moderately Hard |
| Mercier–Hochelaga-Maisonneuve, Quebec | 72 mg/L | Medium | 🟡 Moderately Hard |
| Laflèche, Quebec | 70.5 mg/L | Medium | 🟡 Moderately Hard |
| Greenfield Park, Quebec | 90.5 mg/L | Medium | 🟡 Moderately Hard |
National Benchmark
How Le Vieux-Longueuil compares to the Canada average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Le Vieux-Longueuil | 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 Vieux-Longueuil's Water Unique?
Local geology and source profile
Le Vieux-Longueuil (the historic urban core of the City of Longueuil) receives its drinking water through Ville de Longueuil, part of the same integrated St. Lawrence River supply network serving the broader Longueuil agglomeration on the South Shore. Water is treated at the Longueuil Water Treatment Plant using coagulation, sedimentation, filtration, ozonation, and chloramination, fully meeting the Guidelines for Canadian Drinking Water Quality (GCDWQ). Hardness in Le Vieux-Longueuil's distribution zone is 73 mg/L (4.3 gpg) — classified as moderately hard by Health Canada, notably softer than the broader Longueuil average, reflecting the supply zone's particular blend of St. Lawrence and tributary sources.
Le Vieux-Longueuil's supply zone draws from a treatment point influenced by both the St. Lawrence River and upstream blending with Rivière des Prairies tributary flow carrying softer water from Precambrian Shield highlands to the north. As this softened blend is distributed through the historic downtown Longueuil supply zone closest to the river, measured hardness at 73 mg/L is substantially lower than in outer Longueuil districts receiving more upstream-influenced supply.
At 73 mg/L, Le Vieux-Longueuil residents see only modest scale deposits in kettles and on tap aerators — descaling two to three times a year is sufficient. Hot water tanks operate efficiently at this hardness without dedicated scale treatment. In Le Vieux-Longueuil's older housing stock — including many heritage buildings from the 18th and 19th centuries near the historic town centre — Ville de Longueuil advises residents to follow Health Canada guidance on lead precautions and to participate in available lead service line replacement programmes.
Geology & Source: Supplied by Ville de Longueuil from the St. Lawrence River via the Longueuil Water Treatment Plant — supply in this historic borough's distribution zone is softened by blending with Rivière des Prairies-influenced water, producing water at 73 mg/L (4.3 gpg).