West Humber-Clairville Water Hardness & Quality Report (2026)

The West Humber-Clairville neighbourhood in Toronto, Ontario, receives its municipal water supply from the City of Toronto Water division. The primary sources are Lake Ontario, treated at the R.C. Harris Water Treatment Plant and the F.J. Horgan Plant, with additional filtration from the Humber River. This supply serves Etobicoke North within Toronto County, providing water to both homes and businesses in this urban and suburban area. The watershed feeding these sources includes the Niagara Escarpment and the Oak Ridges Moraine.

The region's geology is defined by Paleozoic limestone and dolostone formations, such as the Georgian Bay Formation, Queenston group, and Lockport group. Groundwater within the Oak Ridges Moraine aquifer system also interacts with these dolomitic limestones and shales, leading to the dissolution of calcium and magnesium. This karst geology, combined with surface runoff from limestone outcrops and recharge through fractured carbonates, results in a moderately mineralized water character, typical of the Great Lakes lowlands.

As moderately hard water, this supply can lead to some scale buildup in appliances like kettles and dishwashers, and you might notice reduced lathering from soaps in the shower. Over time, efficiency losses in appliances such as hot water heaters and washing machines can occur. To combat these effects and extend the lifespan of your fixtures, regular descaling with vinegar, installing scale-inhibiting filters, or considering a whole-house water softener are practical options. Toronto Water adheres to strict quality standards, with typical pH readings between 7.5 and 8.2.