Thetford Mines drinking water path

Source

Grand lac Saint-François (primary filtration plant since ~2013) Mixed supply · +1 sources

to plant

Treatment

Usine de filtration Thetford Mines (Rang … chlorination · filtration

finished

Mains

Distribution 600 mm raw transmission from lake; serves central Thetford, Pontbriand, Robertsonville; Black Lake sector historically on wells.

drinking water

Tap

Household tap Thetford Mines

Source & supply
Grand lac Saint-François (primary filtration plant since ~2013)
Black Lake sector groundwater wells (legacy sector supply)
600 mm raw transmission from lake; serves central Thetford, Pontbriand, Robertsonville; Black Lake sector historically on wells.
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).
Treatment
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.
Treatment on record: chlorination · filtration
At the tap
Hardness 178 mg/L (Hard)
Grade B (Good)
pH 7.1 · lead 0.2 μg/L
ECCC / municipal open data (seed)