From source to sink
Where Thetford Mines water comes from
A plain-language tour of the lakes, rivers, or wells that feed Thetford Mines, 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 Thetford Mines water lives
Source waters and treatment plants pinned from published utility names. Open a pin below for the full OpenStreetMap view.
- CityThetford Mines
Municipal service area
- Treatment plantUsine de filtration Thetford Mines (Rang des Campagnards, Adstock)
Approximate pin near Thetford Mines (exact plant coordinates pending)
Map data © OpenStreetMap contributors. Pins are approximate for orientation, not legal survey points.
Deep dive for households
Thetford Mines drinking water starts as a mix of surface water and wells. The named sources on the utility record are Grand lac Saint-François (primary filtration plant since ~2013), Black Lake sector groundwater wells (legacy sector supply). That is the water that eventually reaches kitchen taps after treatment, not a separate bottled brand.
Water is cleaned at Usine de filtration Thetford Mines (Rang des Campagnards, Adstock) before it enters city pipes. Surface plant on Grand lac Saint-François: filtration + chlorination. Black Lake sector retains well-protection / reservoir works.
After treatment, water moves through pumps, storage, and underground mains to reach streets and buildings. 600 mm raw transmission from lake; serves central Thetford, Pontbriand, Robertsonville; Black Lake sector historically on wells.
One detail that makes Thetford Mines water feel local: The asbestos-mining city now mostly drinks Grand lac Saint-François water from a plant in neighbouring Adstock,lake-level impact of the withdrawal is tiny (~0.23 mm/day). 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
Mixed surface and groundwater
A blend of surface water and wells, depending on the neighbourhood or season.
Research confidence: high
Named source waters
- Grand lac Saint-François (primary filtration plant since ~2013)
- Black Lake sector groundwater wells (legacy sector supply)
Treatment plants
These are the buildings that filter and disinfect water before it enters city pipes.
Usine de filtration Thetford Mines (Rang des Campagnards, Adstock)
Surface plant on Grand lac Saint-François: filtration + chlorination. Black Lake sector retains well-protection / reservoir works.
How it reaches your street
600 mm raw transmission from lake; serves central Thetford, Pontbriand, Robertsonville; Black Lake sector historically on wells.