Lake Bonavista Water Hardness & Quality Report (2026)

Lake Bonavista's drinking water is managed by the City of Calgary, drawing from the Elbow River via the Glenmore Water Treatment Plant — Lake Bonavista is one of Calgary's most prestigious planned residential neighbourhoods in the southeast quadrant, centred around the private Lake Bonavista (a constructed recreational lake managed by the Lake Bonavista Community Association, offering swimming, boating, and fishing for residents), a community of executive homes, mature trees, and manicured estates in the Anderson Road-Macleod Trail corridor of south Calgary, one of Calgary's original 'lake community' concepts from the 1960s that influenced decades of subsequent planned community development across the city. Water undergoes coagulation, sedimentation, filtration, UV disinfection, and chloramination, fully meeting the Guidelines for Canadian Drinking Water Quality (GCDWQ). Hardness in Lake Bonavista is 201.5 mg/L (11.8 gpg) — classified as very hard by Health Canada, at the lower end of the Glenmore plant southeast Calgary range.

Lake Bonavista draws from the Elbow River Glenmore plant supply serving the south and southeast Calgary distribution. At 201.5 mg/L, Lake Bonavista is at the lower end of the Glenmore plant range (session reference: 184.5–252.5 mg/L), consistent with the Glenmore plant supply character in the outer south Calgary distribution. The Elbow River carries dissolved Devonian carbonate from the southern Alberta Rockies and the Kananaskis watershed, producing very hard supply throughout the Calgary system.

At 201.5 mg/L, Lake Bonavista homeowners face persistent scale challenges — monthly to bimonthly kettle and showerhead descaling is typical. Hot water tanks benefit from periodic inspection. The City of Calgary provides water quality information at calgary.ca/water. Health Canada lead precautionary guidance applies to pre-1975 properties in the older section of the established Lake Bonavista neighbourhood.