Customers will be affected by outages from 10 o'clock tonight until 6 o'clock tomorrow morning.
Irish Water is advising customers in Westmeath of further restrictions tonight.
Customers in Athlone and the surrounding areas will be affected by outages from 10 o'clock tonight until 6 o'clock tomorrow morning.
The company say it's necessary to allow water levels to recover in the Annagh Reservoir following a mechanical failure at the water treatment plant.
A temporary water station has been established at Carn Road, Mount Temple, to minimise disruption to customers in the area.
Customers are reminded to bring clean containers and to boil water taken from these stations before use, as a precaution.