A precautionary boil-water advisory is in effect for a portion of Saint-Lazare, an off-island suburb west of Montreal. The advisory was issued Tuesday. The municipality says an unplanned outage occurred due to an aqueduct failure during work on a sewer project. The entire suburb is not affected. The advisory is for the area east of Montée Saint-Robert as a precautionary measure only, for a minimum period of three consecutive days. This is the time required for the water to be analyzed by a certified laboratory and for the results to be communicated to the municipality.