Eglinton East Water Hardness & Quality Report (2026)

Eglinton East (a residential neighbourhood in southeast Scarborough, Toronto, near Eglinton Avenue East and Brimley Road — a diverse community of post-war single-family homes and apartments with a significant South Asian and Black Caribbean population) 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 252 mg/L (14.7 gpg) — classified as very hard by Health Canada, with TDS of 662 mg/L and pH 8.3 — harder than the typical central Toronto range (230–240 mg/L) and notably harder than the adjacent eastern Scarborough lower-hardness sub-zones (Bendale 165 mg/L, Agincourt North 154.5 mg/L, Dorset Park 154.5 mg/L).

Eglinton East's 252 mg/L places it among the harder Scarborough distribution sub-zones — distinct from the lower-hardness anomaly in the north Scarborough corridor and harder than even the standard central Toronto supply. The TDS of 662 mg/L and pH of 8.3 suggest a supply with elevated calcium carbonate and bicarbonate content, possibly reflecting a specific distribution routing in the southeast Scarborough network that draws more directly from the R.C. Harris main distribution at higher pressure without blending from the softer sub-zones that characterise north Scarborough.

At 252 mg/L, Eglinton East residents face persistent scale challenges — kettle and showerhead descaling every two to three weeks is typical. Hot water tanks accumulate scale rapidly and benefit from annual inspection and flushing. The City of Toronto provides multilingual water quality information at toronto.ca/water — relevant for this community's diverse Cantonese, Tamil, and Caribbean-heritage resident population. Lead service line review for pre-1955 properties is recommended.