Government departments have issued an urgent appeal for people to conserve water as much as they possibly can.
A statement issued this evening read: 'Due to critical water supply levels users of public water schemes are urged to conserve water as much as possible.
'Saving water at this time will prevent reduction in pressure and water being cut off.'
Many local authorities have rationed public water supplies due to burst pipes and a rise in demand.
Supply has been interrupted across the country because of low pressure across the network.
Householders are asked to either contact their local council directly or check their website for updates.
South Dublin County Council says areas north of the Naas Road have now lost their water supply.
There will be further water disruptions and the council is asking people in all areas to continue to conserve water.
Fingal County Council is mobilising water tankers and opening standpipes to locations in their jurisdiction affected by disruption to the water.
Dún Laoghaire-Rathdown County Council says reservoir levels are critically low. In order to recharge water storage and return to normal supply levels, council engineers are reducing the volume of water going into the network from the reservoir.
In the south of the country, Cork City Council says water has been restored to the Mercy University Hospital and adjoining area.
However, 5,000 homes are without water across the city and county because the pipes from local authority mains to their houses remain frozen.
Donegal County Council had to shut off supply from some sources last night, with burst water pipes thought to be the main problem.
Leitrim County Council says that while the water situation in the county has improved, consumers are advised that in order to conserve water it may be necessary to continue to turn off water supplies in certain areas nightly until further notice.
Water shortages and restrictions are continuing to affect thousands of households throughout Co Clare. Water tankers were deployed at locations for a number of hours today.
However, for the second day, Clare County Council will be shutting off water supplies throughout the county to preserve supplies.
Limerick City Council is also asking people to conserve water because of short supply caused by a 20% increase in demand over the cold spell.
Wicklow Local Authorities have urged the public to conserve water during the cold weather. Due to the cold weather, water usage throughout the county has increased dramatically.
The council says crews are repairing leaks and bursts as they arise.
A major burst in the south Sligo has resulted in a disruption to the water supply in Gurteen Village and Boyle Road Gurteen.