The Cabinet has approved plans to build a €139 million waste water treatment plant in Arklow, Co Wicklow.
The project is likely to start within the first three months of next year and should be completed by September 2025.
Arklow town currently has no waste water treatment infrastructure. In 2019, the Court of Justice of the European Union mentioned the town in a judgment against Ireland for failing to meet the Urban Waste Water Treatment Directive.
The new facility will serve a population of 24,000 with potential to be upgraded to 36,000 if needed.
The Minister for Housing and Local Government, Darragh O'Brien, said that today's approval is a "hugely important step to rectifying the unacceptable situation whereby untreated waste water is released directly to the Avoca River".
As part of the project, a 930 metre sea outfall will be built, to remove treated effluent.