Those north of I-70 and south of Highway 370 are advised to boil their drinking water until further notice, city officials said.

A large portion of St. Charles is under a boil water advisory Tuesday morning after a water main break in the area.

The City of Saint Charles is working on a large water main break on Cole Boulevard Tuesday morning. The city says Saint Charles water customers north of I-70 and south of Highway 370 are under a boil water advisory because of a brief period of low water pressure.