Maple Leaf Water Hardness & Quality Report (2026)

Maple Leaf (a northwest Toronto neighbourhood at the Wilson Avenue–Jane Street intersection — the Maple Leaf area of north York at Wilson and Jane, a dense residential community of post-war bungalows and semi-detached homes north of the Keelesdale-Eglinton West area, adjacent to Maple Leaf Park and the Jane-Wilson commercial corridor, a predominantly Italian-Canadian, Caribbean, and Southeast Asian community in the established north York residential belt near the Wilson subway station and the Wilson Avenue corridor that runs west to Humber College) 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 238 mg/L (13.9 gpg) — classified as very hard by Health Canada, consistent with the standard north York-west Toronto supply.

Maple Leaf receives F.J. Horgan plant Lake Ontario supply through the north York-west 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 238 mg/L is consistent with the Yonge-Eglinton (238 mg/L from batch 33) and the standard west-north York corridor supply (229–240 mg/L range from reference data).

At 238 mg/L, Maple Leaf 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 post-war bungalow and semi-detached housing stock for pre-1955 properties in the established Maple Leaf residential area.