Wexford/Maryvale Water Hardness & Quality Report (2026)

Wexford/Maryvale residents in north Scarborough get their municipal water from Toronto Water, which serves over 500,000 people across Toronto and parts of York Region. The main source is Lake Ontario, with water treated at the R.C. Harris Water Treatment Plant and the F.J. Horgan Plant. This system mixes surface water from the lake with some groundwater, distributing it through a vast network. Toronto has jurisdiction over the service, though data from York Region is relevant for nearby areas like Vaughan. The supply originates from the Lake Ontario watershed, a region shaped by limestone-heavy geology.

The area sits atop Paleozoic bedrock, specifically Ordovician and Silurian limestones and dolomites. These rock formations, including the Georgian Bay Formation and Lindsay Formation, leach minerals like calcium and magnesium into the water. Rivers such as the Rouge River and Don River carry these minerals into Lake Ontario. Groundwater also picks up minerals as it filters slowly through calcium-carbonate sediments, further increasing the water's mineral content and contributing to its characteristic hardness.

Dealing with this hard water means you'll likely notice scale buildup in your pipes, water heaters, and fixtures. This can shorten the lifespan of appliances like water heaters, dishwashers, and washing machines, while also reducing their efficiency. Kettles and coffee makers quickly develop white deposits, and you might find that soap doesn't lather well, leaving a film on dishes and your skin. Many homeowners in the Greater Toronto Area find that installing a water softener is the best way to prevent damage and extend the life of their appliances, a common practice in the region.