Arbour Lake Water Hardness & Quality Report (2026)

Arbour Lake residents receive their water supply through The City of Calgary Water Services, a municipal distributor. The primary source is the Bow River, with water treated at the Bearspaw Water Treatment Plant. A secondary source, the Elbow River, is treated at the Glenmore Water Treatment Plant, though Arbour Lake primarily gets its supply from Bearspaw. This supply originates in the Rocky Mountains, where Paleozoic carbonate formations like the Banff and Pekisko formations contribute dissolved minerals as they erode. The Paskapoo Formation aquifer in the foothills further adds ions during river recharge.

The geology of the Bow River watershed is key to the water's character. Limestone and dolomite dissolution upstream, particularly within the Banff and Pekisko formations, releases calcium and magnesium ions, making the water hard. The Paskapoo Formation, composed of sandstone and shale, also influences the mineral content. Karst geology and the presence of evaporitic minerals in the region contribute to the elevated mineral load, typical of prairie river systems, with seasonal shifts due to snowmelt and winter conditions.

Homeowners will notice the effects of this hard water through limescale buildup in appliances like kettles and water heaters, which can decrease their efficiency and lifespan; flushing hot water tanks twice a year is advisable. Faucets and showerheads may show spotting, and you'll find reduced lathering from soaps and detergents in laundry and dishwashing. For those seeking to extend appliance life and improve soap performance, a water softener is recommended for these very hard conditions, preventing stubborn soap scum. The water is treated with coagulation, filtration, and chloramination, with a pH around 8.1 aiding corrosion control.