From source to sink
Where Laval water comes from
A plain-language tour of the lakes, rivers, or wells that feed Laval, 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 Laval water lives
Source waters and treatment plants pinned from published utility names. Open a pin below for the full OpenStreetMap view.
- CityLaval
Municipal service area
- Source waterRivière des Prairies
Source water
- Source waterRivière des Mille-Îles
Source water
- Treatment plantStation de Chomedey
Approximate pin near Laval (exact plant coordinates pending)
- Treatment plantStation de Pont-Viau
Approximate pin near Laval (exact plant coordinates pending)
- Treatment plantStation de Sainte-Rose
Approximate pin near Laval (exact plant coordinates pending)
Map data © OpenStreetMap contributors. Pins are approximate for orientation, not legal survey points.
Deep dive for households
Laval drinking water starts as surface water (rivers, lakes, or reservoirs). The named sources on the utility record are Rivière des Prairies, Rivière des Mille-Îles. That is the water that eventually reaches kitchen taps after treatment, not a separate bottled brand.
Laval uses more than one treatment plant (Station de Chomedey; Station de Pont-Viau; Station de Sainte-Rose). Utilities often run plants in parallel so different neighbourhoods can be served, or so one plant can cover for another during maintenance. Station de Chomedey: Largest Laval plant; draws from Rivière des Prairies; can backfeed other sectors in emergency. Station de Pont-Viau: East/central plant on Rivière des Prairies corridor; major upgrades completed mid-2010s.
After treatment, water moves through pumps, storage, and underground mains to reach streets and buildings. Three production stations feed about 1,650 km of distribution mains. The network is meshed so plants primarily serve their sectors but can support each other if one plant is offline.
One detail that makes Laval water feel local: Laval is a frequent multi-star recipient in Réseau Environnement’s Programme d’excellence en eau potable for surface-water plants. 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
- Rivière des Prairies
- Rivière des Mille-Îles
Treatment plants
These are the buildings that filter and disinfect water before it enters city pipes.
Station de Chomedey
Largest Laval plant; draws from Rivière des Prairies; can backfeed other sectors in emergency.
Station de Pont-Viau
East/central plant on Rivière des Prairies corridor; major upgrades completed mid-2010s.
Station de Sainte-Rose
Northern plant on Rivière des Mille-Îles side of Île Jésus.
How it reaches your street
Three production stations feed about 1,650 km of distribution mains. The network is meshed so plants primarily serve their sectors but can support each other if one plant is offline.