Works are being carried out to fix it.
Homes and businesses in Westmeath are currently without water.
People in the Great Oakes and surrounding areas of Mullingar are currently cut off following a burst watermain.
Uisce Éireann is expecting works to be completed by 2:30pm this afternoon.
Everyone impacted is being advised it can take up to three hours for the normal water supply to be fully restored.
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