Wexford/Maryvale Water Hardness & Quality Report (2026)

Wexford/Maryvale (a residential neighbourhood in mid-Scarborough, Toronto, along Lawrence Avenue East and Warden Avenue near the Scarborough-Agincourt corridor) receives its drinking water from the City of Toronto, drawing from Lake Ontario via the R.C. Harris Water Treatment Plant on the Kingston Road lakeshore. 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 236.5 mg/L (13.8 gpg) — classified as very hard by Health Canada, with TDS of 599 mg/L, consistent with the central Scarborough distribution corridor.

Wexford/Maryvale sits within the mid-Scarborough distribution network receiving standard R.C. Harris plant Lake Ontario supply — the same fundamentally very hard Lake Ontario water (dissolved Silurian and Devonian carbonate from the Great Lakes basin, 234–240 mg/L) that characterises most of Toronto's eastern and central distribution zones. The 236.5 mg/L sits in the typical central Toronto range, distinct from the lower-hardness eastern Scarborough sub-zones (Bendale 165 mg/L, Agincourt North 154.5 mg/L) which reflect different supply routing in the southeast Scarborough corridor.

At 236.5 mg/L, Wexford/Maryvale residents face persistent scale challenges — kettle and showerhead descaling every one to two weeks is typical. Hot water tanks benefit from annual inspection and flushing. The City of Toronto provides water quality information and lead service line programme details at toronto.ca/water; residents in the neighbourhood's established post-war residential housing stock are encouraged to review lead service line status and follow Health Canada precautionary guidance.