Princess-Rosethorn 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
608.2 mg/L
Est. Daily Cost
$0.64
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 Princess-Rosethorn, your appliances are currently losing 32% efficiency due to mineral buildup.
| Appliance | In Princess-Rosethorn | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.7 yrs | 8.5 yrs | -80% |
| Washing Machine | 4.7 yrs | 12 yrs | -61% |
| Water Heater | 6 yrs | 15 yrs | -60% |
Regional Water Comparison
How Princess-Rosethorn compares to its nearest neighbours
| City | Hardness | Mineralization | Risk |
|---|---|---|---|
| ▶ Princess-Rosethorn, Ontario | 240 mg/L | Very High | 🔴 Very Hard |
| Willowridge-Martingrove-Richview, Ontario | 239 mg/L | Very High | 🔴 Very Hard |
| Edenbridge-Humber Valley, Ontario | 237.5 mg/L | Very High | 🔴 Very Hard |
| Etobicoke West Mall, Ontario | 190 mg/L | Very High | 🔴 Very Hard |
| Islington-City Centre West, Ontario | 238.5 mg/L | Very High | 🔴 Very Hard |
National Benchmark
How Princess-Rosethorn compares to the Canada average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Princess-Rosethorn | 240 mg/L | 🔴 High |
| Canada National Avg | 141 mg/L | 🟠 Moderate |
| Vancouver Top Rated | 3 mg/L | 🟢 None |
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What Makes Princess-Rosethorn's Water Unique?
Local geology and source profile
Princess-Rosethorn (a southwest Etobicoke neighbourhood of upscale residential streets near the Old Mill Road–Islington corridor — the Princess Anne Road-Rosethorn Road area in the Etobicoke east-central plateau, a prestigious residential neighbourhood of large mid-century bungalows and split-levels on the post-war Etobicoke residential crescent between Bloor Street West and the Kingsway, adjacent to the James Gardens ravine park, the Lambton Woods, and the Humber River valley trail system, one of Etobicoke's most desirable 1950s–1960s residential addresses near the Kingsway–Royal York commercial corridor) 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 240 mg/L (14.0 gpg) — classified as very hard by Health Canada, consistent with the standard southwest Etobicoke supply.
Princess-Rosethorn receives F.J. Horgan plant Lake Ontario supply through the southwest Etobicoke distribution — the same characteristically very hard Lake Ontario source (dissolved Silurian and Devonian carbonate from the Great Lakes basin) as all Toronto boroughs. The 240 mg/L is at the upper end of the standard Toronto supply range — harder than the anomalously softer southwest Etobicoke sub-zones nearby (Etobicoke West Mall 190 mg/L, Alderwood 200 mg/L from batch 32), reflecting the Princess-Rosethorn inner plateau location at a different F.J. Horgan pipeline branch.
At 240 mg/L, Princess-Rosethorn 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 the neighbourhood's 1950s–1960s bungalow and split-level housing stock for pre-1975 properties in the established Princess-Rosethorn streets.
Geology & Source: Supplied by City of Toronto from Lake Ontario via the F.J. Horgan Water Treatment Plant — the Princess-Rosethorn southwest Etobicoke distribution zone carries very hard water at 240 mg/L (14.0 gpg), consistent with the standard southwest Etobicoke supply corridor.