A new boil water notice has been issued across Dublin, Kildare and Meath.
600,000 people who have their water supplied by the Leixlip Treatment Plant are affected.
Irish Water says the notice is in place as a precaution and has come about following long spells of heavy rain.
Irish Water says turbidity in the source water for the old Leixlip Plant has exceeded acceptable levels.
Eamon Gallen, Irish Water’s General Manager said: "We are very disappointed that a Boil Water Notice has to be imposed again but as we outlined the last time, our number one priority is the public health and the safety and well-being of our customers."
Irish Water is due to appear before an Oireachtas committee tomorrow to answer questions about the previous boil water notice.
Boil water notice resumed for North Dublin. We will have Irish Water in before @OireachtasNews Committee at my suggestion tomorrow at 1 where I will work to get answers on this important issue. pic.twitter.com/zcOl3vSFuz
— Noel Rock (@NoelRock) November 4, 2019
