Rouge Water Hardness & Quality Report (2026)
Water Hardness
Source
lake
pH Level
7.8
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
370.2 mg/L
Est. Daily Cost
$0.46
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 Rouge, your appliances are currently losing 23% efficiency due to mineral buildup.
| Appliance | In Rouge | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 3.9 yrs | 8.5 yrs | -54% |
| Washing Machine | 7.2 yrs | 12 yrs | -40% |
| Water Heater | 8.7 yrs | 15 yrs | -42% |
Regional Water Comparison
How Rouge compares to its nearest neighbours
| City | Hardness | Mineralization | Risk |
|---|---|---|---|
| ▶ Rouge, Ontario | 172 mg/L | High | 🟠 Hard |
| Highland Creek, Ontario | 258 mg/L | Very High | 🔴 Very Hard |
| Centennial Scarborough, Ontario | 232.5 mg/L | Very High | 🔴 Very Hard |
| West Hill, Ontario | 269.5 mg/L | Very High | 🔴 Very Hard |
| Morningside, Ontario | 250 mg/L | Very High | 🔴 Very Hard |
National Benchmark
How Rouge compares to the Canada average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Rouge | 172 mg/L | 🟠 Moderate |
| Canada National Avg | 141 mg/L | 🟠 Moderate |
| Vancouver Top Rated | 3 mg/L | 🟢 None |
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What Makes Rouge's Water Unique?
Local geology and source profile
Rouge (the easternmost community of Toronto, bordering the Rouge National Urban Park in east Scarborough) receives its drinking water from the City of Toronto, drawing from Lake Ontario via the R.C. Harris Water Treatment Plant on the Kingston Road lakeshore. Water is treated using ozonation, biofiltration, UV disinfection, and chloramination, meeting all Guidelines for Canadian Drinking Water Quality (GCDWQ) standards. Hardness in Rouge's distribution zone is 172 mg/L (10.0 gpg) — classified as hard by Health Canada, consistent with Toronto's east end distribution zone but somewhat below the very hard values measured in the Malvern and Woburn sub-zones further west in Scarborough.
Rouge's supply draws from the R.C. Harris plant on the Lake Ontario shore — a plant whose deep-water intakes draw from the western Lake Ontario basin where dissolved Silurian and Devonian carbonate minerals from the Great Lakes watershed accumulate. The 172 mg/L measured in Rouge's distribution zone reflects the standard Lake Ontario calcium load in this eastern supply corridor, moderated slightly relative to the higher values in Scarborough's more inland distribution sub-zones that carry additional mineral contact time through longer transmission mains.
At 172 mg/L, Rouge homeowners experience regular scale deposits on kettle elements, showerheads, and in hot water tanks — monthly descaling is typical. Annual hot water tank inspection and flushing are recommended. The City of Toronto provides water quality information at toronto.ca/water; residents in this area's mix of post-war and newer residential housing are encouraged to review their zone-specific hardness data and consider a scale inhibitor filter or whole-home softener if scale build-up is a persistent concern.
Geology & Source: Supplied by City of Toronto from Lake Ontario via the R.C. Harris Water Treatment Plant — the Rouge (east Scarborough) distribution zone carries hard water at 172 mg/L (10.0 gpg), reflecting Lake Ontario's Silurian–Devonian carbonate basin mineral load in Toronto's easternmost supply corridor.