The advisory applies to about 520 customers of the Raft Island Water System, the state Department of Health said.
Samples tested after the pipe was repaired showed potentially harmful E. coli bacteria.
Department of Health officials advised residents to boil their water vigorously for one minute before drinking it or using it to brush their teeth, prepare food, make ice or wash dishes.
The advisory will remain in effect until samples meet safe drinking water standards.
Customers with questions can call 253-851-4060 or toll free at 877-408-4060.