MERCER ISLAND, Wash. (AP) — A boil-water advisory that closed restaurants and forced schools to operate with bottled water for nearly a week in a wealthy Seattle suburb has been lifted, even though inspectors never found the source of E. coli that prompted it.

City officials said Wednesday it’s safe again to drink the water again on Mercer Island after samples tested clean for six straight days. The boil-water advisory was lifted at noon after consultations with Public Health Seattle-King County and the state Department of Health.