Mississauga Water Hardness & Quality Report (2026)
Water Hardness
Source
lake
pH Level
7.7
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
250 mg/L
Est. Daily Cost
$0.35
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 Mississauga, your appliances are currently losing 17% efficiency due to mineral buildup.
| Appliance | In Mississauga | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5.3 yrs | 8.5 yrs | -38% |
| Washing Machine | 8.8 yrs | 12 yrs | -27% |
| Water Heater | 10.4 yrs | 15 yrs | -31% |
Regional Water Comparison
How Mississauga compares to its nearest neighbours
| City | Hardness | Mineralization | Risk |
|---|---|---|---|
| ▶ Mississauga, Ontario | 130 mg/L | High | 🟠 Hard |
| Etobicoke, Ontario | 190 mg/L | Very High | 🔴 Very Hard |
| Brampton, Ontario | 130 mg/L | High | 🟠 Hard |
| Toronto, Ontario | 124 mg/L | High | 🟠 Hard |
| Vaughan, Ontario | 130 mg/L | High | 🟠 Hard |
National Benchmark
How Mississauga compares to the Canada average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Mississauga | 130 mg/L | 🟠 Moderate |
| Canada National Avg | 104 mg/L | 🟡 Low |
| Vancouver Top Rated | 3 mg/L | 🟢 None |
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What Makes Mississauga's Water Unique?
Local geology and source profile
Mississauga's drinking water is delivered by the Region of Peel, which operates the Lakeview Water Treatment Plant in Mississauga and the Hanlan Water Treatment Plant in Brampton, both drawing from Lake Ontario. Water undergoes coagulation, sedimentation, filtration, ozonation, and chloramination, consistently meeting the Guidelines for Canadian Drinking Water Quality (GCDWQ). Water hardness measures 130 mg/L (7.6 gpg) — classified as moderately hard by Health Canada, reflecting the mineral composition of Lake Ontario water.
Lake Ontario receives inflow from the upper Great Lakes — Huron, Michigan, Superior, and Erie — all draining diverse Precambrian and Paleozoic geology. By the time water reaches Lake Ontario, it carries dissolved calcium and magnesium from Silurian dolomite and limestone formations in the Ontario lowlands. Mississauga's proximity to the west end of the lake means it receives water with consistent hardness year-round, with minimal seasonal fluctuation.
Mississauga households experience moderate scale build-up on tap aerators, showerheads, and kettle heating elements, typically requiring descaling every two months. Hot water tank efficiency can diminish gradually as limescale coats the tank's heating surface. The Region of Peel recommends periodic tank maintenance; a whole-home water softener is optional at this hardness level but improves appliance longevity and reduces cleaning effort.
Geology & Source: Supplied by Region of Peel from Lake Ontario, sourced at the Lakeview and Hanlan water treatment plants — Great Lakes glacial and dolomite watershed chemistry produces water at 130 mg/L (7.6 gpg).