According to a ruling by the highest European court, the amount of some chemicals in Irish drinking water surpasses EU safety standards.

Irish national network RTÉ says that the European Court of Justice (ECJ) has found that the Republic of Ireland has not complied with its duties under the EU's primary drinking water law.

It claimed that the concentration of trihalomethanes, or THMs, in drinking water is dangerously high.

The court stated that THMs are dangerous to both people and the environment and can be discovered in water treatment systems that utilize chlorine to eliminate pollutants and bacteria.

The European Commission filed a lawsuit against the Republic (EC).

It claimed that the Republic had not taken the required actions to comply with the directive regarding THM concentration.

It stated that the Republic had not succeeded in "as quickly as possible" restoring the drinking water's quality.

According to the ECJ, Irish Water was assigned in January 2014 to make sure that drinking water quality complied with EU requirements set forth in Directive 98/83 on the quality of water meant for human use.

Information about the amounts of THM concentrations in drinking water that the Irish authorities gave the EC in 2015 was rejected by the EC on the grounds that it did not adhere to the directive.

Following 2020 orders, the commission started an infringement procedure because, according to a court statement, it was not pleased with the responses received between September 2020 and June 2021.

The European Court of Justice (ECJ) ruled on Thursday that the Republic was had to abide by all of the directive's requirements, including those pertaining to THM concentrations, even though it was allowed to determine how it applied the directive within its own legal framework.

The European Court of Justice stated that the nation could not "fully justify" the continuation of a pattern of noncompliance.

The court was informed that high concentrations of THMs had been found in drinking water for a significant amount of time.

The court determined that the EC had presented "sufficient evidence to support Ireland’s alleged breach" based on the material submitted, and the Republic was unable to refute the facts as alleged by the commission.

The ECJ therefore ruled that the Republic had failed to fulfil its obligations under Article 4 of the safe drinking water directive.