Uisce Éireann has confirmed that preparatory works have commenced on the Greater Dublin Drainage (GDD) Project, following the project's approval in December 2025.

The start of these activities marks a major milestone for one of Ireland's most significant strategic infrastructure schemes, intended to provide essential wastewater treatment capacity to underpin housing delivery, economic growth and environmental protection across the Greater Dublin Area.

The GDD Project will deliver wastewater treatment capacity for the equivalent of approximately 500,000 people and support the delivery of up to 185,000 new homes across north Dublin and parts of Meath and Kildare.

Early-phase works are progressing in Abbottstown, Clonshaugh and Silloge, covering archaeological investigations, establishment of access, and the installation of fencing and hoarding. Most of this activity will take place off public roads and has been scheduled to co-ordinate with third-party projects to minimise disruption to the wider public.

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A Maritime Usage Licence (MUL) was granted by the Maritime Regulator in March 2026 for the marine surveys and site investigations required for the scheme. As part of this, a temporary barge will be positioned offshore in Portmarnock Bay from June 2026.

Preliminary works construction is due to begin by the end of this year, with main works expected to commence in 2028. The project remains on track for accelerated completion in 2031. Uisce Éireann has pledged to keep local communities and stakeholders informed as delivery progresses.

Speaking about the project, Senior Portfolio Manager with Uisce Éireann Eoin Ahern said: "The Greater Dublin Drainage Project is essential national infrastructure that will help unlock housing delivery and support sustainable economic growth across the Greater Dublin Area for decades to come. As population growth continues, investment in wastewater is critical to protecting public health, safeguarding the environment, and ensuring the region can continue to develop sustainably. The commencement of these preparatory works marks a vital step forward in delivery of this essential project."

The GDD scheme comprises a regional wastewater treatment facility at Clonshaugh, an orbital sewer network, a pumping station, and a marine outfall to the Irish Sea.

Identified as the optimal long-term solution for the region's future wastewater needs, the project will significantly relieve pressure on the existing Ringsend Wastewater Treatment Plant, unlocking capacity for future housing. It will also protect coastal and marine waters and help Ireland meet national and EU environmental standards.

Uisce Éireann, which provides public drinking water and wastewater services nationwide, says it is committed to enabling communities to thrive by investing in critical infrastructure that supports sustainable growth and safeguards the environment.