Irish Water is replacing around 615 metres of problematic water mains in Macroom.
The works at Kilnagurteen will begin early next month and should be finished by mid-December.
Crews will be laying new water service connections on the Millstreet Road opposite the entrance to the Glenties residential estate.
Irish Water say the works may involve some short-term water outages and that customers will be given at least 48 hours prior notice.
