Rockcliffe-Smythe Water Hardness & Quality Report (2026)

Rockcliffe-Smythe (a working-class west Toronto neighbourhood near Runnymede Road and St. Clair Avenue West — an established immigrant reception area with significant Portuguese and South Asian communities, centred on the Smythe Park and the Runnymede–Bloor West Village corridor) receives its drinking water from the City of Toronto, drawing from Lake Ontario via the F.J. Horgan 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 602 mg/L, consistent with the west Toronto and Etobicoke distribution corridor.

Rockcliffe-Smythe receives F.J. Horgan plant Lake Ontario supply through the west Toronto distribution network — the same characteristically very hard Lake Ontario source (dissolved Silurian and Devonian carbonate from the Great Lakes basin) that supplies all Toronto boroughs. The 238.5 mg/L is consistent with the adjacent Stonegate-Queensway (240.5 mg/L) and Willowridge-Martingrove-Richview (239 mg/L) in the same Etobicoke–west Toronto distribution corridor.

At 238.5 mg/L, Rockcliffe-Smythe residents face persistent scale challenges — kettle and showerhead descaling every one to two weeks is typical. The neighbourhood's established 1940s–1950s working-class housing stock is among the most likely to include original lead service lines; the City of Toronto's lead service line replacement programme at toronto.ca/water should be reviewed by all residents. Multilingual water quality information in Portuguese and South Asian languages is available through the City's water quality programme.