Stonegate-Queensway Water Hardness & Quality Report (2026)

Stonegate-Queensway (a residential neighbourhood in southwest Toronto's Etobicoke district, centred on the Queensway and Islington Avenue — encompassing a mix of post-war bungalows, mid-century apartment buildings, and a growing condominium corridor along the Queensway corridor toward The Kingsway) 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 in this distribution zone is 240.5 mg/L (14.1 gpg) — classified as very hard by Health Canada, with TDS of 608 mg/L, consistent with the Etobicoke supply corridor.

Stonegate-Queensway receives F.J. Horgan plant Lake Ontario supply through the southwest Etobicoke distribution network — the same characteristically very hard Lake Ontario source (dissolved Silurian and Devonian carbonate from the Great Lakes basin) supplying all Toronto boroughs. The 240.5 mg/L is consistent with the broader Etobicoke and west Toronto corridor, sharing the standard very hard Toronto supply that has characterised all of the city's distribution zones.

At 240.5 mg/L, Stonegate-Queensway residents face persistent scale challenges — kettle and showerhead descaling every one to two weeks is typical. Hot water tanks accumulate scale rapidly and benefit from annual inspection and flushing. The City of Toronto provides water quality information and lead service line programme details at toronto.ca/water. Stonegate-Queensway's established post-war housing stock includes many pre-1955 properties where review of lead service line status through the City's replacement programme is recommended.