The advisory is being issued as a precaution after a water main break.

Residents within the Mt. Morris city limits are being asked to boil their water. This is from the fire department:
The City of Mt Morris is issuing a boil water advisory/notice until further notice for the following area within the City of Mt Morris water system: Customers who are south of W Mt Morris St and west of N Saginaw St. The notice is being issued as a precautionary measure due to a water main break located within the City of Mt Morris.

We'll keep you up to date on the situation.