A boil water notice remains in place for customers supplied by the Killavullen Public Water Supply.
High levels of turbidity were found in borehole supply, causing the Killavullen Water Treatment Plant to be shut down.
The boil water notice affects 810 homes and businesses in the area, and all customers on this supply are advised to boil their water before use until further notice.
Irish Water say they are working with Cork County Council to rectify the issues at the treatment plant as soon as possible.
