Water pressure's returning to normal across parts of the city and Wicklow after overnight restrictions.
The measure will be in place from 10.00pm until 5.00am for at least the next week to deal with the ongoing shortage.
Irish Water say it could be weeks before supplies are restored.
Kate Gannon from the utility says the hosepipe ban has been helping to reduce demand.
"We can really see the effort that homes and businesses have made to conserve water.
"Demand reduced significantly in the Dublin region from the very high levels when the weather was very hot back down to normal levels again.
"They're slightly below average of where we were this time last year.
"We'd hope that with continued sustained conservation efforts, and the efforts that we're making on the ground in terms of minimising pressures, that we will see some recovery in our sources".
Environment Minister Denis Naughten says this is going to be an "ongoing challenge".
"Our winters are going to be getting wetter, but our summers are going to be getting drier.
"And we're going to have to come up with long-term solutions to meet the challenges that we're experiencing first-hand at the moment - but are going to become far more frequent into the future".