From source to sink
Where Calgary water comes from
A plain-language tour of the lakes, rivers, or wells that feed Calgary, the plants that clean the water, and how it reaches kitchen taps. Lab grades for hardness, lead, and pH live on the water quality page.
On the map
Where Calgary water lives
Source waters and treatment plants pinned from published utility names. Open a pin below for the full OpenStreetMap view.
- CityCalgary
Municipal service area
- Source waterBow River
Bow through Calgary
- Source waterElbow River
Elbow / Glenmore area
- Treatment plantBearspaw Water Treatment Plant
Bearspaw plant (public project coords)
- Treatment plantGlenmore Water Treatment Plant
Beside Glenmore Reservoir
Map data © OpenStreetMap contributors. Pins are approximate for orientation, not legal survey points.
Deep dive for households
Calgary drinking water starts as surface water (rivers, lakes, or reservoirs). The named sources on the utility record are Bow River, Elbow River. That is the water that eventually reaches kitchen taps after treatment, not a separate bottled brand.
Calgary uses more than one treatment plant (Bearspaw Water Treatment Plant; Glenmore Water Treatment Plant). Utilities often run plants in parallel so different neighbourhoods can be served, or so one plant can cover for another during maintenance. Bearspaw Water Treatment Plant: Draws from Bearspaw Reservoir on the Bow River; supplies roughly 60% of Calgary’s treated water, primarily serving the north via an interconnected grid. Glenmore Water Treatment Plant: Draws from Glenmore Reservoir fed by the Elbow River; supplies roughly 40% of the city’s water, primarily serving the south.
After treatment, water moves through pumps, storage, and underground mains to reach streets and buildings. High-lift pumps send treated water into transmission mains that feed storage reservoirs and pump stations across the city. Bearspaw and Glenmore systems are cross-connected so either plant can support demand citywide. Calgary also sells bulk treated water to regional customers including Airdrie.
One detail that makes Calgary water feel local: Almost all water withdrawn from the Bow and Elbow for Calgary use is returned to the Bow River system after wastewater treatment. Bearspaw Reservoir doubles as hydroelectric infrastructure operated with TransAlta. Lab grades for hardness, lead, and pH sit on the city water quality page; this overview is about the route the water travels.
Where it starts
Surface water
Rivers, lakes, or reservoirs, not underground wells as the main draw.
Research confidence: high
Named source waters
- Bow River
- Elbow River
Treatment plants
These are the buildings that filter and disinfect water before it enters city pipes.
Bearspaw Water Treatment Plant
Draws from Bearspaw Reservoir on the Bow River; supplies roughly 60% of Calgary’s treated water, primarily serving the north via an interconnected grid.
Glenmore Water Treatment Plant
Draws from Glenmore Reservoir fed by the Elbow River; supplies roughly 40% of the city’s water, primarily serving the south.
How it reaches your street
High-lift pumps send treated water into transmission mains that feed storage reservoirs and pump stations across the city. Bearspaw and Glenmore systems are cross-connected so either plant can support demand citywide. Calgary also sells bulk treated water to regional customers including Airdrie.