UPEI is under a water boil order.
A spokeswoman for the university says a water main break was discovered and repaired Monday.
As a precautionary measure, she adds, the boil order is remaining in place until test results come back.
The order is expected to be lifted by Wednesday.
Bottled water has been delivered to students living in residence and people have been told to refrain from drinking from water fountains and taps on campus.