Cornwall drinking water path

• Source & supply

  Saint Lawrence River

  Includes Boundary Road Reservoir and Tollgate Road elevated storage feeding the Class 3 city distribution system.

  Cornwall’s intake sits at a major St. Lawrence power dam, so intake protection zones and zebra-mussel control are built into plant operations.

• Treatment

  Cornwall Water Purification Plant

  Class 3 plant at 861 Second Street West. Intake and zebra-mussel control facilities at the base of R.H. Saunders Dam. Chemically assisted coagulation/flocculation, filtration, UV, and chlorine disinfection.

  Treatment on record: chlorination · UV · filtration

• At the tap

  Hardness 130 mg/L (Hard)

  Grade B (Good)

  pH 7.3 · lead 0.2 μg/L

  ECCC / municipal open data (seed)