L'Amoreaux Water Hardness & Quality Report (2026)

Toronto Water supplies the L'Amoreaux neighbourhood in north Scarborough, Ontario, Canada. This area's water originates from Lake Ontario, treated at the R.C. Harris Water Treatment Plant and Island Water Treatment Plant, with the F.J. Horgan plant also contributing. Raw water is drawn from the lake's intakes, providing service to over 500,000 residents. The Lake Ontario watershed includes Paleozoic sedimentary basins where Ordovician limestone and dolostone formations, such as the Queenston Shale and Simcoe Group, dissolve and impart minerals. Runoff from the Niagara Peninsula and Hamilton's bedrock further contributes to the moderately mineralized to hard water character. While no single aquifer dominates, groundwater from regional limestone karst features blends in, adding to the mineral profile.

This supply is geologically shaped by the Lake Ontario watershed, which transitions from the Canadian Shield into Paleozoic sedimentary basins. Underlying the catchment are Ordovician limestone and dolostone formations, including the Georgian Bay and Lindsay formations. The dissolution of these rocks, particularly limestone, is the primary reason for the water's hard character, as it picks up dissolved calcium and magnesium. Glacial deposits and karst features within the Niagara Escarpment region also play a role in mineral pickup from the blend of surface and groundwater.

Homeowners in L'Amoreaux might notice limescale buildup in appliances like kettles and coffee makers, which can reduce efficiency by up to 30%. Hot water heaters are particularly susceptible. You may also find spotting on dishes from the dishwasher, stiffer laundry, and residue around bathtubs. To combat these effects and extend appliance life, a water softener is often recommended for homes. For mild cases, regular descaling with vinegar can help, but ion-exchange systems are more effective for consistently hard supplies. The water's pH remains stable between 7.3 and 7.8, well within acceptable guidelines, and Toronto manages lead and copper levels through corrosion control and pipe replacement.