Updated 11:13 p.m.

The City of Burlington is advising residents to boil drinking water following a water main break and depressurization of the system.

The advisory is citywide, except for what the city calls its "high service area," which includes the University of Vermont and the UVM Medical Center. It extends to South Burlington residents who are on Burlington's municipal water supply. The city published a map of the affected area.

"We are currently working on the required sampling protocol to ensure all drinking water is safe to ingest," says the advisory, issued Saturday. "At this time, the precautionary boil water advisory is likely to last through most of tomorrow."

Some city businesses were affected. City Market, Onion River Co-op closed both of its Burlington stores.

For updates, check the Department of Public Works' Facebook page. You can also sign up to receive alerts.