They're saying levels at Lough Owel remain low despite rainfall.
Uisce Eireann says water levels at a Westmeath lake remain low despite an ongoing hosepipe ban.
A Water Conservation Order is remaining in place for customers of the Mullingar Regional Public Water Supply.
The utility says despite heavy rainfall, the water levels at Lough Owel remain critically lower than previously recorded at this time of year.
It says there is a need for significant levels of rainfall over a prolonged period of time in order for the source to recover.
Uisce Eireann is increasing its efforts to safeguard the supply, by doubling down on leakage detection, pipe repair and overall network management.
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