Cliffcrest Water Hardness & Quality Report (2026)

Cliffcrest receives its drinking water from the City of Toronto Water division, a utility serving over 2.9 million people in Toronto and parts of Peel Region. The water originates in Lake Ontario, drawn through intake cribs like the Eastern Avenue Crib near the Scarborough Bluffs, which serves the Cliffcrest area. Major treatment facilities, including the R.C. Harris Water Treatment Plant and the Highland Creek plant, process the water. This supply flows from the Lake Ontario watershed, which is influenced by the Niagara Escarpment and the Canadian Shield. The journey of this water involves passing through Paleozoic limestone and dolostone formations from the Silurian period, such as the Lockport Dolomite, where it can pick up calcium and magnesium.

Geologically, Cliffcrest's water is shaped by its journey through the Queenston Formation, comprised of Ordovician limestone and shale, and Paleozoic sedimentary layers. These bedrock types can leach minerals into the water. However, the vast volume of Lake Ontario and the limited interaction with regional aquifers, like the Amabel Formation where groundwater tends to be hard, mean the water remains soft. The lake's environment, influenced by glacial till and lacustrine sediments, further contributes to a low mineral content, buffering the inputs from tributary rivers such as the Rouge River.

Because the water is soft, homeowners in Cliffcrest can expect fewer issues with limescale buildup in appliances like water heaters and dishwashers, potentially extending their lifespan. Soap and detergents will lather more easily, improving cleaning efficiency without creating excessive suds. A water softener isn't necessary, but it's wise to watch for any potential corrosion in plumbing or fixtures, with phosphate inhibitors available if needed. The City of Toronto Water maintains a pH between 7.8 and 8.3 to help prevent such corrosion, and the water consistently meets Ontario Drinking Water Standards.