(CN) - Ireland's long struggle to clean up its waters hit a breaking point Thursday, as Europe's top court said the country had dragged its feet too long on one of the EU's flagship environmental laws, after years of warnings, missed deadlines and half-measures that never quite fixed the problem.

In its ruling, the EU's top judges said Ireland's national laws still don't match the standards set out in the bloc's 2000 clean-water directive, formally known as the Water Framework Directive, which requires governments to protect and restore rivers, lakes and groundwater. More than two decades after those rules took effect, the court found that Ireland's legal framework remains incomplete and out of step with EU requirements.

Ireland's patchwork of water laws, the judges said, is riddled with gaps - from vague definitions to missing review deadlines and weak monitoring rules - leaving the overall system still below EU standards.

And the confusion runs even deeper. Under Irish law, "water services" is defined in two conflicting ways, with one version limited to public supply and wastewater systems and another that stretches to nearly any use of water, from irrigation to drainage. 

That contradiction, the court explained, leaves both citizens and regulators unsure who falls under the rules and what exactly counts as a regulated service. As the judges put it, "The coexistence under Irish law of two competing definitions of 'water services' does not satisfy the requirement of legal certainty."

The dispute traces years of back-and-forth between Brussels and Dublin over how Ireland put the EU's clean-water law into effect. The European Commission first sounded the alarm in 2007, sending a string of warnings and deadlines that came and went with little progress. Ireland eventually passed new legislation in 2018 and again in 2022, but the judges said those fixes arrived too late to matter, since EU rules only look at whether a country was in compliance when the final deadline expired.

Ireland's missteps, the judges said, weren't just technicalities. They pointed out that the government had accidentally deleted a key rule requiring the country to review and update its analysis of each river basin every six years - a cycle meant to keep track of pollution sources and water quality trends. It was a mistake Ireland later acknowledged. Even so, the court made clear that "it is irrelevant whether the failure to fulfil obligations is the result of intention or negligence."

The court also flagged gaps in how Ireland handled groundwater and protected areas. They said the country's laws simply pointed back to the EU directive instead of clearly stating what should happen when different water-quality targets overlap. Under EU rules, the strictest standard is supposed to win out, but Ireland's version left that point vague, making it harder for regulators to know which limits to enforce and risking weaker protection for the most sensitive waterways.

Alberto Quintavalla, associate professor at Erasmus School of Law, said the ruling doesn't rewrite EU water law but draws its lines more clearly. Ireland's conflicting definitions of "water services," he explained, had left its legislation muddled, and the judgment makes clear that compliance depends on one consistent and transparent approach.

He added that the decision also highlights the need for stronger, data-driven oversight. Ireland, he said, had ignored key technical standards for tracking water quantity and quality, relying on vague language instead. 

"Today's case highlights the importance of monitoring for EU regulation," he said. "Water quantity and quality can vary, and it is important that we always have granular and accurate data about its fluctuations over time. Without that data, it is impossible to come up with measures that respond to the facts on the ground. That the court has emphasized the importance of evidence and evidence-based regulation is surely to be commended."

Under the directive, every EU country must create and regularly update river-basin plans designed to bring all surface and groundwater up to "good status." Ireland has struggled to keep pace. Reviews by the European Environment Agency have repeatedly flagged pollution from farm runoff, leaking wastewater systems and growing urban sprawl. While some regions have made progress, only about half of Ireland's rivers and lakes meet the EU's target.

The ruling also marks Ireland's second major environmental setback in as many years. In 2024, the same court found that the country had failed to keep dangerous levels of trihalomethanes - chemical byproducts formed when chlorine reacts with organic matter in water - within EU safety limits. That case exposed long-standing issues in Ireland's drinking water system, from aging pipes to weak oversight. These latest judgments have left Ireland under growing pressure from the EU, underscoring that environmental rules are no longer optional but enforceable commitments.

In a statement, Ireland's Minister for Housing, Local Government and Heritage, James Browne, said the government is reviewing the ruling "with the assistance of the officials in my department and in consultation with the Office of the Attorney General," adding that Ireland "will respond to this judgment swiftly with positive and constructive actions in order to bring Ireland into full compliance." He said a work program is being prepared to review national laws and address any remaining gaps.

The European Commission did not immediately respond to a request for comment.

With the court's findings now final, Ireland must move fast to fix its water laws or face a new infringement case that could come with heavy fines. The European Commission can bring the country back before the court if progress stalls, and at that stage the judges would be able to impose daily or lump-sum penalties. 

For Dublin, the message is clear: The legal debate is over, and the only question now is how quickly it can bring its system into full compliance.

Courthouse News reporter Eunseo Hong is based in the Netherlands.

Source: Courthouse News Service