Alderwood Water Hardness & Quality Report (2026)

Alderwood (a neighbourhood in the southwest corner of Toronto-Etobicoke, between Evans Avenue and the Lake Shore corridor near the Long Branch area — a post-war residential community of bungalows and detached homes near the Humber College Lakeshore Campus, the Alderwood Arena, and the Etobicoke–Long Branch waterfront trail along Lake Ontario, a predominantly working-class Etobicoke community of Italian-Canadian and British-heritage families established in the post-war 1950s–1960s suburban boom) 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 200 mg/L (11.7 gpg) — classified as very hard by Health Canada, an anomalously softer sub-zone in the southwest Etobicoke distribution.

Alderwood's 200 mg/L is notably softer than the standard F.J. Horgan Toronto supply (229–240 mg/L), joining the cluster of anomalously softer southwest Etobicoke sub-zones (Etobicoke West Mall 190 mg/L, Humber Summit 173 mg/L) that show significantly softer supply than the central Toronto standard. This southwest Etobicoke distribution sub-zone at the Long Branch–Alderwood corridor appears to draw from a specific F.J. Horgan pipeline routing at the Lakeshore West distribution extremity that produces a notably softer sub-zone measurement.

At 200 mg/L, Alderwood residents face persistent scale challenges — monthly kettle and showerhead cleaning is typical. Hot water tanks benefit from periodic inspection. 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 post-war bungalow housing stock for pre-1955 properties in the established Alderwood Etobicoke streets.