Moss Park Water Hardness & Quality Report (2026)

Moss Park receives its municipal drinking water from the City of Toronto Water division, which serves over 2.8 million residents. The main water source is Lake Ontario, with raw water drawn through intakes that supply the R.C. Harris Water Treatment Plant and the F.J. Horgan Filtration Plant. Although Moss Park itself isn't directly served by groundwater wells, the broader Toronto system is predominantly surface-water based, drawing from the Lake Ontario basin. Treatment processes include screening, chemical coagulation, filtration, and disinfection using chlorine to ensure safe drinking water.

The Lake Ontario watershed's geology is significantly shaped by Paleozoic sedimentary rocks, primarily limestone and dolomite. These formations, exposed in areas like the Niagara Escarpment, are rich in minerals. As water flows across this landscape and through regional aquifers, it dissolves calcium and magnesium from these soluble rocks. This geological interaction is why Lake Ontario's surface water has a moderately mineralized character, while groundwater drawn from deeper Paleozoic carbonate aquifers tends to be harder due to extended contact with the mineral-rich bedrock.

Homeowners in areas with harder water supplies, like those relying on groundwater, may notice scale buildup in appliances such as water heaters, kettles, and dishwashers, which can reduce their efficiency and shorten their lifespan. Soap may not lather as effectively, leading to soap scum in showers, and fixtures might spot more easily. Descaling water heaters every one to two years is a good maintenance practice. For those experiencing significant hardness from groundwater or wanting extra protection for their plumbing, installing a water softener is often recommended. Toronto's treated water, with a typical pH between 7.5 and 8.2, consistently meets regulatory standards for lead and copper, and recent reports show no concerning levels of PFAS or disinfection byproducts.