Water restrictions are still in place in many parts of the country tonight.
Local authorities say interruptions in supply are likely to continue until the end of this week as they wait for levels at reservoirs to recover.
Demand for water surged today as many people returned to work following the Christmas break, while many areas are also struggling with leakage from ageing and decaying pipes.
Engineer with Dublin City Council Brian McKeown said he was confident restrictions would be lifted in the days ahead.
“The fundamental issue is that our demand, including the leakage, is above our capacity to treat water and by putting in restrictions, we’ve driven that demand down so that we can put water into storage,” he said.
He said as leaks were fixed, demand would drop below their ability to treat the water and at that stage “we’re back to normal”.