Boil water advisory lifted in Chateauguay, Mercier still in effect
Posted June 13, 2026 6:25 pm.
Last Updated June 14, 2026 7:06 pm.
A boil water advisory that was placed Saturday for the city of Chateauguay has been lifted but remains in Mercier.
The City of Châteauguay announced Saturday that a precautionary boil water advisory has been put in place after a technical malfunction was detected at the Marchand drinking water production plant.
The notice affected all municipalities connected to Châteauguay’s water distribution system, including Châteauguay, Mercier, Léry, Saint-Urbain-Premier and Sainte-Martine.
Until the advisory is lifted, residents are encouraged to use bottled water or boil tap water for at least one minute before consuming it. The recommendation also applies to brushing teeth, preparing beverages and washing foods that will be eaten raw.
Municipal officials emphasized that normal bathing and showering can continue. However, parents of young children are advised to limit the amount of water used in bathtubs and ensure children do not swallow bathwater.
The city says boiling water for a minimum of one minute eliminates microorganisms that could potentially affect water quality.
Crews are currently working to address the issue at the treatment plant, and the advisory will remain in effect until testing confirms the water supply meets all safety standards.
