Irish Water engineers are working to fix two leaks in Cavan and Monaghan.
Burst water mains have been reported in both the Shercock area of Cavan and the Coolshannagh area of Monaghan town.
Repairs at both locations are expected to be completed by lunchtime today.
Earlier this morning, repairs were carried out to a second leak affecting the Rockcorry and Aughmullen areas of Monaghan.
Irish Water says the issue has been resolved and water will return to the network in the next few hours.
Irish Water has thanked customers for their patience and if there are any concerns the care helpline is open 24/7 on 1850 278 278 and customers can also contact Irish water on Twitter.