Homes, businesses and farms in the Tooban area of Inishowen are without water following a burst water main.
Supply disruptions have been reported in Crislamore, Fahan and surrounding areas.
Irish Water crews are aware of the incident and are working to restore water today.
Works have an estimated completion time of 4:30pm.
Customers are advised that supplies may take 2-3 hours to fully return to all affected properties.