Yonge-St.Clair 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
597.4 mg/L
Est. Daily Cost
$0.63
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 Yonge-St.Clair, your appliances are currently losing 32% efficiency due to mineral buildup.
| Appliance | In Yonge-St.Clair | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.8 yrs | 8.5 yrs | -79% |
| Washing Machine | 4.8 yrs | 12 yrs | -60% |
| Water Heater | 6.1 yrs | 15 yrs | -59% |
Regional Water Comparison
How Yonge-St.Clair compares to its nearest neighbours
| City | Hardness | Mineralization | Risk |
|---|---|---|---|
| ▶ Yonge-St.Clair, Ontario | 237 mg/L | Very High | 🔴 Very Hard |
| Casa Loma, Ontario | 232 mg/L | Very High | 🔴 Very Hard |
| Mount Pleasant West, Ontario | 235.5 mg/L | Very High | 🔴 Very Hard |
| Annex, Ontario | 239 mg/L | Very High | 🔴 Very Hard |
| Forest Hill South, Ontario | 239.5 mg/L | Very High | 🔴 Very Hard |
National Benchmark
How Yonge-St.Clair compares to the Canada average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Yonge-St.Clair | 237 mg/L | 🔴 High |
| Canada National Avg | 141 mg/L | 🟠 Moderate |
| Vancouver Top Rated | 3 mg/L | 🟢 None |
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What Makes Yonge-St.Clair's Water Unique?
Local geology and source profile
Yonge-St.Clair (a prestigious midtown Toronto neighbourhood centred on the intersection of Yonge Street and St. Clair Avenue — the St. Clair station area with its upscale condominium towers and established detached homes on the Forest Hill-adjacent streets, the Avenue Road-Oriole-Heath corridor of upper-income midtown Toronto, the St. Clair shopping strip with its established restaurants and boutiques, and the transit junction of the Yonge-University subway line and the St. Clair streetcar on one of Toronto's most important midtown axes) receives its drinking water from the City of Toronto, drawing from Lake Ontario via the F.J. Horgan 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 237 mg/L (13.8 gpg) — classified as very hard by Health Canada, consistent with the standard midtown Toronto supply.
Yonge-St.Clair receives F.J. Horgan plant Lake Ontario supply through the midtown Toronto distribution — the same characteristically very hard Lake Ontario source (dissolved Silurian and Devonian carbonate from the Great Lakes basin) as all Toronto boroughs. The 237 mg/L matches Corso Italia-Davenport (237 mg/L from batch 28) and is consistent with the standard Yonge-Eglinton–St.Clair midtown corridor (236–237 mg/L).
At 237 mg/L, Yonge-St.Clair residents face persistent scale challenges in this neighbourhood's prestigious condominiums and Edwardian detached homes — 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 Yonge-St.Clair midtown residential streets.
Geology & Source: Supplied by City of Toronto from Lake Ontario via the F.J. Horgan Water Treatment Plant — the Yonge-St.Clair midtown Toronto distribution zone carries very hard water at 237 mg/L (13.8 gpg), consistent with the Yonge-Eglinton–St.Clair midtown supply corridor.