O'Connor-Parkview Water Hardness & Quality Report (2026)

O'Connor-Parkview (a residential East York neighbourhood centred on O'Connor Drive and Parkview Hills, overlooking the Don Valley escarpment east of the Don Valley Parkway — a largely post-war family community of bungalows and semi-detached homes with direct ravine access to the Don Valley trail network, popular with East York's established Ukrainian and Italian heritage communities) receives its drinking water from the City of Toronto, drawing from Lake Ontario via the R.C. Harris 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 238.5 mg/L (13.9 gpg) — classified as very hard by Health Canada, with TDS of 604 mg/L, consistent with the East York and Don Valley supply corridor.

O'Connor-Parkview receives R.C. Harris plant Lake Ontario supply through the East York distribution network — the same characteristically very hard Lake Ontario source (dissolved Silurian and Devonian carbonate from the Great Lakes basin) as all Toronto boroughs. The 238.5 mg/L is consistent with the adjacent Thorncliffe Park (238 mg/L), Rosedale-Moore Park (238 mg/L), and the broader east Toronto–East York supply corridor.

At 238.5 mg/L, O'Connor-Parkview residents face persistent scale challenges — kettle and showerhead descaling every one to two weeks is typical. The neighbourhood's substantial post-war bungalow stock includes many pre-1955 properties where the City of Toronto's lead service line replacement programme at toronto.ca/water is relevant. The Don Valley and ravine proximity and established community character make O'Connor-Parkview a desirable family neighbourhood, though Health Canada precautionary guidance on lead is applicable throughout the area's older heritage housing stock.