Cloudy water is the cause of the notice.
The boil water notice affecting 600,000 people in the greater Dublin area will remain in place according to Irish Water.
The notice was reintroduced on Monday, just under two weeks after the initial boil notice was lifted.
The boil water notice is in place due to problems at the Irish Water Leixlip treatment plant, which is unable to cope with cloudy water particles caused by recent heavy rain.
You can view the full map of affected areas here.
A Status Yellow rainfall warning is in effect for Dublin, Meath, Wicklow, Kildare and Louth and will remain in place until 9pm on Thursday.
Irish Water has said it’s not possible to say conclusively at this time what impact the weather warning may have on the water produced but said they will be monitoring the situation closely.
Speaking about the Boil Water Notice, Irish Water’s General Manager, Eamon Gallen, said: “Irish Water apologises for the impact and inconvenience caused by this Boil Water Notice to homes and businesses. Our number one priority is public health and the safety and well-being of our customers.
“We would like to reassure our customers that Irish Water’s drinking water and operational experts are working with our colleagues in Fingal County Council and in consultation with the HSE and the EPA to resolve this issue as quickly as possible.
“While we are working to bring the water back to a safe standard so that the Boil Water Notice can be lifted, we would like to remind people to check if they are in an affected area and to familiarise themselves with the safety advice. We would like to thank the public, media and elected representatives for sharing the news of the Boil Water Notice as it is essential that we reach as many people as possible.”
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