The city of Gatineau says approximately 15,000 residents will be under a boil water advisory starting Tuesday night. The boil water advisory is due to water main work in the city. It comes into effect at 11 p.m. and will remain in effect until it is lifted. The homes affected by the advisory are located between Montée Paiement and Avenue du Cheval-Blanc, Highway 50 and the Ottawa River.