A boil water notice has been issued to 9,500 homes and businesses in Co Cork.
The notice comes following a filtration issue at the Whitegate Regional Water Supply.
The issue is said to affect the following areas: Whitegate, Aghada, Rostellan, Saleen, Cloyne, Shanagarry, Ballycotton, Churchtown South and Ballinacurra.
Irish Water say the notice will remain in effect until further notice.