Centennial Scarborough Water Hardness & Quality Report (2026)
Water Hardness
Source
lake
pH Level
8.2
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
585 mg/L
Est. Daily Cost
$0.62
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 Centennial Scarborough, your appliances are currently losing 31% efficiency due to mineral buildup.
| Appliance | In Centennial Scarborough | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.9 yrs | 8.5 yrs | -78% |
| Washing Machine | 5 yrs | 12 yrs | -58% |
| Water Heater | 6.3 yrs | 15 yrs | -58% |
Regional Water Comparison
How Centennial Scarborough compares to its nearest neighbours
| City | Hardness | Mineralization | Risk |
|---|---|---|---|
| ▶ Centennial Scarborough, Ontario | 232.5 mg/L | Very High | 🔴 Very Hard |
| Highland Creek, Ontario | 258 mg/L | Very High | 🔴 Very Hard |
| Rouge, Ontario | 172 mg/L | High | 🟠 Hard |
| West Hill, Ontario | 269.5 mg/L | Very High | 🔴 Very Hard |
| Morningside, Ontario | 250 mg/L | Very High | 🔴 Very Hard |
National Benchmark
How Centennial Scarborough compares to the Canada average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Centennial Scarborough | 232.5 mg/L | 🔴 High |
| Canada National Avg | 141 mg/L | 🟠 Moderate |
| Vancouver Top Rated | 3 mg/L | 🟢 None |
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What Makes Centennial Scarborough's Water Unique?
Local geology and source profile
Centennial Scarborough (a neighbourhood in the extreme east end of Scarborough, Toronto — near Port Union Road and the Rouge National Urban Park border, adjacent to the Centennial College Morningside Campus and the Lake Ontario waterfront near the Port Union Village, in the easternmost part of the City of Toronto approaching the Pickering boundary, an area of mixed residential development, the Rouge River valley greenway, and the scenic Port Union Waterfront Park on Lake Ontario) receives its drinking water from the City of Toronto, drawing from Lake Ontario via the R.C. Harris Water Treatment Plant. Water is treated using ozonation, biofiltration, UV disinfection, and chloramination, meeting all Guidelines for Canadian Drinking Water Quality (GCDWQ) standards. Hardness is 232.5 mg/L (13.6 gpg) — classified as very hard by Health Canada, consistent with the standard east Scarborough R.C. Harris supply.
Centennial Scarborough lies in the eastern extremity of the R.C. Harris plant distribution area — drawing the same characteristically very hard Lake Ontario supply (dissolved Silurian and Devonian carbonate from the Great Lakes basin) as all Scarborough communities. The 232.5 mg/L is consistent with the standard Toronto east Scarborough supply range (230–240 mg/L), without the anomalous harder or softer sub-zone characteristics observed in some inner Scarborough and Beach corridor areas.
At 232.5 mg/L, Centennial Scarborough residents face persistent scale challenges — monthly to bimonthly kettle and showerhead descaling is typical. The City of Toronto provides multilingual water quality information at toronto.ca/water. Health Canada lead service line precautionary guidance applies to pre-1975 properties in the established Centennial Scarborough residential streets.
Geology & Source: Supplied by City of Toronto from Lake Ontario via the R.C. Harris Water Treatment Plant — the Centennial Scarborough far-east distribution zone carries very hard water at 232.5 mg/L (13.6 gpg), consistent with the east Scarborough R.C. Harris supply corridor near the Pickering boundary.