Supplies in Laois and Offaly are coming under particular scrutiny.
Irish Water says its watching reservoirs in the Midlands closely to see if restrictions will be needed.
Warm weather is leading to water levels dropping with demand increasing.
Water is already being brought to the Swan to maintain supply to the area.
John Gavin is an Irish Water engineer, he says there are supplies in Offaly that are a current cause for concern:
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