Cliffcrest Water Hardness & Quality Report (2026)

Cliffcrest (a south Scarborough neighbourhood overlooking the Scarborough Bluffs — centred near Kingston Road and Cliffcrest Drive, an established residential community of post-war and 1960s bungalows and detached homes on the Scarborough Plateau above the dramatic shale and clay bluffs of Lake Ontario's north shore, one of Toronto's most scenic residential areas with the Bluffer's Park beach and marina below and the Rouge Valley to the east) 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 159.5 mg/L (9.3 gpg) — classified as hard by Health Canada, consistent with the south Scarborough lower-hardness sub-zone.

Cliffcrest's 159.5 mg/L is in the same cluster as Kennedy Park (155 mg/L), Weston (155 mg/L), Bendale (154.5 mg/L) — all significantly softer than the central Toronto baseline of 230–240 mg/L. The south Scarborough–Cliffcrest distribution sub-zone along the Kingston Road Bluffs corridor appears to share the anomalously softer supply characteristic of these Scarborough sub-zones, possibly reflecting a specific distribution routing through the southern Scarborough infrastructure.

At 159.5 mg/L, Cliffcrest residents experience regular but moderate scale deposits — monthly kettle descaling is typical, but at a notably lower rate than central Toronto. The City of Toronto provides water quality information at toronto.ca/water. Health Canada lead service line precautionary guidance applies to the neighbourhood's established post-war housing stock, and residents in pre-1955 homes along the Kingston Road heritage corridor should check the City's lead service line replacement programme.