Dublin could be facing the prospect of water pressure reductions and night-time restrictions.
Irish Water has admitted it is struggling to meet demand in many areas with 18,000 homes around the country without water overnight.
Irish Water managing director Jerry Grant said that number has now been brought down to 11,500.
He said there are currently water restrictions on place at 126,000 homes around the country.
The Greater Dublin Area saw a 10% increase in demand from Friday to Sunday – with storage dropping by 30 million litres.
The utility has warned that, if the depleting levels are not reversed, the city could be facing pressure reductions and the possibility of night-time restrictions.
Mr Grant said the Dublin area saw a surge of 60 million litres a day "compared to the normal daily usage."
"Which is more than we can produce," he said.
"All our plants in the greater Dublin area are flat out to produce 580 million litres last night.
"It will be difficult to maintain that as raw water quality in the rivers dis-improves."