Dufferin Grove Water Hardness & Quality Report (2026)

Dufferin Grove, a Toronto neighbourhood, gets its water from Toronto Water. The main source is Lake Ontario, with treatment happening at the R.C. Harris Water Treatment Plant and the F.J. Horgan Water Treatment Plant. These facilities filter and disinfect the raw lake water before it's sent out to residents. The water comes from the Lake Ontario watershed, which is part of the larger Great Lakes Basin. The journey begins with screening, followed by coagulation and filtration, and finally disinfection to ensure it's safe for consumption. This comprehensive treatment process addresses the raw water quality before it reaches your tap.

The region's geology plays a significant role in the water's mineral content. Underlying Dufferin Grove and much of Southwestern Ontario are Paleozoic rock formations, specifically Silurian dolomites and limestones found in the Niagara Escarpment. As water flows over and through these bedrock layers, it picks up dissolved minerals like calcium and magnesium. Groundwater from local aquifers, also interacting with this karst limestone, further contributes to the mineral load. This natural geological process is why the municipal water supply serving the area is characterized as hard.

Homeowners in Dufferin Grove might notice scale buildup on pipes, water heaters, and fixtures. Appliances that use hot water, such as dishwashers, washing machines, and kettles, are particularly affected, potentially seeing reduced efficiency and a shorter lifespan due to this mineral accumulation. Regular descaling of fixtures and occasional vinegar rinses for showerheads can help manage the issue. For a more comprehensive solution and to prolong the life of your appliances, installing a water softener is often recommended for areas with hard water like Toronto. Toronto Water consistently meets Health Canada guidelines, with recent reports showing good results for lead, copper, and PFAS.