Wicklow has been identified as one of three counties which the EU has warned the Government has to improve the safety of drinking water.
It follows recent data showing that water in certain counties has excessive amounts of a substance called Trihalo-methane.r.
The chemical, which is formed as a by-product of when chlorine is used to disinfect and make water safe for drinking, poses a risk to health.
The European Commission has said Wicklow, Kerry and Donegal are the worst affected.
Ireland has not fulfilled its obligations under the Drinking Water Directive, which aims to protect against the effects of any contamination of water intended for human consumption, according to a warning letter from the Commission.
The letter states: “The Irish authorities have not taken appropriate actions to bring down the value of THMs and to notify consumers of the health implications as required”.
Ireland has been given two months to respond to the warning letter before further action is taken by the Commission.
