Parkwoods-Donalda Water Hardness & Quality Report (2026)

Parkwoods-Donalda (a residential community in northeast Toronto between York Mills Road and Lawrence Avenue East, east of Don Mills Road) 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 Parkwoods-Donalda's distribution zone is 233 mg/L (13.6 gpg) — classified as very hard by Health Canada, consistent with the broadly very hard supply of Toronto's northeast distribution network.

Parkwoods-Donalda receives Lake Ontario water from the R.C. Harris plant's deep western-basin intakes — the standard supply for Toronto's east-end and northeast distribution zones. The 233 mg/L is characteristic of the northeast Toronto corridor, shared with L'Amoreaux (233 mg/L), Willowdale East (235.5 mg/L), and Woburn (240.5 mg/L) sub-zones in the same distribution network. The dissolved Silurian and Devonian carbonate mineral load from the Lake Ontario source produces the consistently very hard water across all northeast Toronto zones.

At 233 mg/L, Parkwoods-Donalda homeowners experience significant hard water effects — kettle and showerhead descaling every one to two weeks is common. Hot water tanks benefit from annual inspection and flushing. This area's established mid-century residential housing stock means many homes have older plumbing — the City of Toronto's lead service line programme is accessible at toronto.ca/water, and residents are encouraged to review lead service line status alongside managing the consistently very hard supply.