Sainte-Agathe-des-Monts drinking water path

• Source & supply

  Petit Lac des Sables (Lac Grignon) — primary raw water

  Lac des Sables (summer top-up pumped into Petit Lac des Sables)

  City page: intake on Lac Grignon / Petit lac des Sables; summer pumping from grand Lac des Sables to keep the upper reservoir up. Reported production capacity ~10,500 m³/day; average ~6,750 m³/day.

  Petit Lac des Sables supplies about two-thirds of annual raw water; in dry summers the city pumps uphill from the bigger Lac des Sables to keep the drinking-water lake topped up.

• Treatment

  Station de purification Ste-Agathe-des-Monts (Petit Lac des Sables)

  MELCC X0008112: chlorination, filtration, and carbon. Filtration plant built ~2010–2012 on the Petit Lac des Sables shore (~10,000 ft²). City also doses zinc orthophosphate corrosion inhibitor (aggressive headwater chemistry).

  Treatment on record: chlorination · filtration

• At the tap

  Hardness 195 mg/L (Very hard)

  Grade C (Fair)

  pH 6.8 · lead 0.3 μg/L

  ECCC / municipal open data (seed)