The European Commission took the case due to the levels of trihalomethanes in drinking water - which are used to remove bacteria.
Europe's highest court says drinking water in Ireland exceeds safety levels.
The Court of Justice says the state failed to meet its obligations on directives.
The court found levels of certain chemical compounds in Irish tap water are both damaging to human health and to the environment.
The European Commission took the case due to the levels of trihalomethanes in drinking water - which are used to remove bacteria.
They can also cause stomach problems and skin irritation.
The case dates back as far as 2014 when Irish Water - now Uisce Eireann - had been asked to ensure drinking water met standards.
Today's findings relate to 21 public water supplies and nine private group schemes.
Large Quantity of Drugs And Weapons Have Been Seized By Gardaí In Dublin
Weapons Facility In Beirut Struck By Israeli Military Overnight
Taxi Driver Numbers Are Expected To Drop
Questions Are Arising Around The Government's Proposal To Spend 9-Million Euro On School Phone Pouches
Dangerous Travel Conditions In Ireland
The Labour Party Is Condemning The Ongoing Dispute Between Management And Workers At The Meta Data Centre
Pfizer To Cut Jobs In Three Of Its Irish Locations, Including Newbridge
LIVE: Budget 2025 Announcements
