Repentigny issued a boil water advisory on Monday and it will likely be in place until at least Wednesday.
A power failure in one section of the city reduced water pressure, prompting the warning.
Residents of Le Gardeur, Carrefour des fleurs, Lachenaie, and Terrebonne should boil their water for one minute before drinking or consuming it in any fashion.
Repentigny will issue an alert when test results show the water is safe to drink.
