Repairs in Dunmanway and Fermoy should be completed this evening.
Uisce Eireann crews are still working to repair damage caused by Storm Bert at the weekend.
The Dunmanway and Fermoy Water Treatment Plant's have been impacted due to poor raw water quality.
Customers have been affected by low water pressure and outages.
It is hoped to have the normal supply restored by 6 o'clock this evening.
Problems with water supply in Mogeely and Clonakilty areas are also being addressed.
