Lethbridge drinking water path

Source

Oldman River Surface water

to plant

Treatment

Lethbridge WTP filtration

finished

Mains

Distribution Plant produces tens of millions of litres per day on average for Lethbridge and regional customers; capacity upgrades are underway to raise maximum daily throughput for southern Alberta growth.

drinking water

Tap

Household tap Lethbridge

Source & supply
Oldman River
Plant produces tens of millions of litres per day on average for Lethbridge and regional customers; capacity upgrades are underway to raise maximum daily throughput for southern Alberta growth.
City messaging explicitly contrasts the Oldman River surface supply with groundwater: Lethbridge’s municipal potable system is river-only.
Treatment
Lethbridge Water Treatment Plant
East bank of the Oldman River south of Whoop-Up Drive; conventional surface-water treatment (coagulation, sedimentation, filtration, disinfection). City states it does not use groundwater wells for the municipal supply.
Treatment on record: filtration
At the tap
Hardness 176 mg/L (Hard)
Grade B (Good)
pH 7.9 · lead 0 μg/L
ECCC / municipal open data (seed)