Casa Loma Water Hardness & Quality Report (2026)
Water Hardness
Source
lake
pH Level
8.1
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
577.2 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 Casa Loma, your appliances are currently losing 31% efficiency due to mineral buildup.
| Appliance | In Casa Loma | 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 Casa Loma compares to its nearest neighbours
| City | Hardness | Mineralization | Risk |
|---|---|---|---|
| ▶ Casa Loma, Ontario | 232 mg/L | Very High | 🔴 Very Hard |
| Wychwood, Ontario | 182 mg/L | High | 🔴 Very Hard |
| Forest Hill South, Ontario | 239.5 mg/L | Very High | 🔴 Very Hard |
| Annex, Ontario | 239 mg/L | Very High | 🔴 Very Hard |
| Yonge-St.Clair, Ontario | 237 mg/L | Very High | 🔴 Very Hard |
National Benchmark
How Casa Loma compares to the Canada average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Casa Loma | 232 mg/L | 🔴 High |
| Canada National Avg | 141 mg/L | 🟠 Moderate |
| Vancouver Top Rated | 3 mg/L | 🟢 None |
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What Makes Casa Loma's Water Unique?
Local geology and source profile
Casa Loma (a midtown Toronto neighbourhood named for the famous Casa Loma Castle — the iconic 98-room Gothic Revival mansion built by Sir Henry Pellatt in 1914, now a premier Toronto tourist attraction and film location on Spadina Road north of St. Clair Avenue, in the residential area of large detached homes and heritage estates on the south escarpment of the Forest Hill Plateau overlooking downtown Toronto, adjacent to the Spadina-Casa Loma heritage corridor, the Annex-Wychwood arts community, and the Seaton Village residential neighbourhood below the Davenport escarpment) 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 232 mg/L (13.6 gpg) — classified as very hard by Health Canada, consistent with the midtown Toronto supply.
Casa Loma 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 232 mg/L is consistent with the Yonge-Eglinton (238 mg/L from batch 33) and the standard midtown-upper west Toronto corridor.
At 232 mg/L, Casa Loma residents face persistent scale challenges — monthly to bimonthly kettle and showerhead descaling is typical. The City of Toronto provides water quality information at toronto.ca/water. Health Canada lead service line precautionary guidance strongly applies to Casa Loma's Edwardian and interwar heritage residential stock — many large detached homes in this neighbourhood date from the 1910s–1940s and may retain lead service connections.
Geology & Source: Supplied by City of Toronto from Lake Ontario via the F.J. Horgan Water Treatment Plant — the Casa Loma midtown Toronto distribution zone carries very hard water at 232 mg/L (13.6 gpg), consistent with the Spadina-St.Clair midtown supply corridor.