A boil water advisory has been issued.
It's in effect for Varennes, Saint-Julie and Saint Amable until further notice.
Officials say tests have been conducted and show the presense of E. Coli in the water.
Residents should boil tap water for one minute before consumption.
Among other things, authorities add unboiled water can be used to wash dishes, wash clothes and to shower or take a bath.
The advisory may be lifted on Tuesday.