WELLESLEY >> A boil-water advisory has been issued for four buildings on the campus of Wellesley College after the water supply tested positive for E. Coli bacteria.

The Massachusetts Department of Environmental Protection issued the advisory Friday after bacteria were found in the water supply at Fiske House, a residential building.

The water line also serves the Child Study Center, the Wellesley Community Children's Center and Weston Terrace, another residential building. Drinking water at these facilities must be boiled.

There are no reported illnesses.

The school says it's chlorinating, flushing and sampling the affected area. It says it will notify residents when the advisory has been lifted.

The Centers for Disease Control and Prevention says E. coli can cause diarrhea, urinary tract infections, respiratory illness, pneumonia and other illnesses.