Le Sud-Ouest Water Hardness & Quality Report (2026)
Water Hardness
~60–119 mg/L
Moderately Hardestimated · not lab-verified
Source
river
pH Level
7.3
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
126.7 mg/L
Est. Daily Cost
$0.24
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 Sud-Ouest, your appliances are currently losing 12% efficiency due to mineral buildup.
| Appliance | In Le Sud-Ouest | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.5 yrs | 8.5 yrs | -12% |
| Washing Machine | 10.6 yrs | 12 yrs | -12% |
| Water Heater | 13.2 yrs | 15 yrs | -12% |
Regional Water Comparison
How Le Sud-Ouest compares to its nearest neighbours
| City | Hardness | Mineralization | Risk |
|---|---|---|---|
| ▶ Le Sud-Ouest, Quebec | ≈ 60–119 mg/L | Medium | 🟡 Moderately Hard |
| Saint-Henri, Quebec | ≈ 120–179 mg/L | High | 🟠 Hard |
| Westmount, Quebec | ≈ 60–120 mg/L | Medium | 🟡 Moderately Hard |
| Verdun, Quebec | ≈ 60–120 mg/L | Medium | 🟡 Moderately Hard |
| Notre-Dame-de-Grâce, Quebec | ≈ 60–120 mg/L | Medium | 🟡 Moderately Hard |
National Benchmark
How Le Sud-Ouest compares to the Canada average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Le Sud-Ouest | ≈ 60–119 mg/L | 🟡 Low |
| Canada National Avg | 140 mg/L | 🟠 Moderate |
| Vancouver Top Rated | 3 mg/L | 🟢 None |
Bring Vancouver-quality water to your Le Sud-Ouest home
Shop water softeners on Amazon.com →
What Makes Le Sud-Ouest's Water Unique?
Local geology and source profile
Le Sud-Ouest borough in Montreal, Quebec, Canada, gets its drinking water from the City of Montreal municipal utility. This supply is a mix drawn from the Saint Lawrence River and groundwater sources. The Atwater treatment plant is the primary facility serving this area, treating water from the St. Lawrence River and moderate Shield tributary inputs.
The water's journey begins in the Saint Lawrence River watershed, flowing through a region characterized by Paleozoic bedrock formations. These include sedimentary rocks and glacial deposits, which naturally impart dissolved minerals into the water supply. This mixed source approach, combining river water with groundwater, results in a moderately mineralized water for residents.
Homeowners in Le Sud-Ouest might observe some scale accumulation in hot water pipes and appliances due to the water's moderate mineral content. While efficiency losses in dishwashers and water heaters are likely to be minor, a water softener is an optional convenience rather than a necessity for most. Some residents opt for one to enhance soap lathering and potentially extend appliance life. City of Montreal reports from 2022 indicated exceedances for lead and turbidity.
Geology & Source: St. Lawrence River and Shield tributary waters; Paleozoic sedimentary bedrock and glacial deposits contribute moderate hardness (4.3 gpg)
Other Quebec Water Reports
Report an Issue
Notice an error or missing data? Help us keep this page accurate. If you spot incorrect water hardness, outdated utility info, or missing details, please let us know.
All reports are reviewed by our team. Thank you for supporting data quality!