Sarnia drinking water path

• Source & supply

  Lake Huron

  LAWSS treats and transmits water to Sarnia, Point Edward, St. Clair Township, Warwick, Plympton-Wyoming, Lambton Shores and other customers; Sarnia operates local distribution within the city.

  Because the LAWSS intake is at the mouth of Lake Huron—upstream of Sarnia’s Chemical Valley—it is not in the same St. Clair River spill-risk zone as Wallaceburg and Walpole Island intakes further downstream.

• Treatment

  Lambton Area Water Supply System (LAWSS) Water Treatment Plant

  Regional plant at the Lake Huron outlet into the St. Clair River (Point Edward / Sarnia area). Intake sits above the Sarnia industrial complex. Jointly owned by Sarnia and neighbouring Lambton municipalities.

• At the tap

  Hardness 162 mg/L (Hard)

  Grade A (Excellent)

  pH 8 · lead 0.2 μg/L

  ECCC / municipal open data (seed)