Ionview Water Hardness & Quality Report (2026)

Ionview (a Scarborough neighbourhood in northeast Toronto — along Ellesmere Road near Ionview Road in the north-central Scarborough plateau, a mixed residential community of post-war bungalows and suburban streets on the Scarborough upland above the Rouge valley, adjacent to the Dorset Park and Kennedy Park 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 sub-zone is exactly 180 mg/L (10.5 gpg) — classified as hard by Health Canada (at the boundary of the 120–180 mg/L hard range), consistent with an anomalously softer Scarborough distribution sub-zone.

Ionview's exactly 180 mg/L sits at the classification boundary, grouping with the cluster of anomalously softer Toronto distribution sub-zones including Cliffcrest (159.5 mg/L), Kennedy Park (155 mg/L), Wychwood (182 mg/L), and Oakridge (183.5 mg/L) — all significantly softer than the central Toronto standard of 230–240 mg/L. This northeast Scarborough sub-zone at Ionview shows a distribution routing characteristic that produces notably softer supply than the main R.C. Harris distribution zone, consistent with specific pressure zone and pipeline routing characteristics in this area of Scarborough.

At 180 mg/L, Ionview residents experience moderate scale deposits — monthly kettle and showerhead cleaning is typical but at a lower rate than central Toronto. 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 Ionview and Dorset Park area.