Greater Dublin Drainage

A new regional wastewater treatment facility and associated infrastructure to serve Dublin and parts of Kildare and Meath.

Why is this project needed?

As our population and economy grow, so too does the volume of wastewater. The amount of wastewater generated in greater Dublin is projected to increase by over 50% in the period to 2050. 

Greater Dublin Drainage (GDD) is a project to develop a new regional wastewater treatment facility and associated infrastructure to serve Dublin and parts of the surrounding counties of Kildare and Meath.

GDD represents the next major step in the development of wastewater infrastructure for Dublin and the surrounding counties. Once operational from 2026, the GDD project will have the capacity to provide wastewater treatment for the equivalent of half a million people to support the needs of our growing population and economy.

Project Solution

The GDD project proposes a new regional wastewater treatment facility to be located in the townland of Clonshaugh in north county Dublin, an underground orbital sewer from Blanchardstown to Clonshaugh, a new pumping station at Abbotsown, a partial diversion of the north fringe sewer, and an outfall pipeline to return the treated water to the Irish Sea. The project also includes a regional sludge treatment centre at the new GDD facility and an associated biosolids storage facility at Newtown near Kilshane Cross.

View our fact sheet for more information on the project benefits. 

GDD receives planning permission

In November 2019, An Bord Pleanála granted planning permission for the Greater Dublin Drainage Project. Irish Water welcomes this landmark planning decision which will support the sustainable future growth of the Dublin area. Having adequate wastewater treatment capacity is vital to protect public health, safeguard the environment and facilitate social and economic growth.

The GDD project will enable residential and commercial development across north Dublin and south Fingal. GDD will also alleviate pressure within the wider Dublin wastewater collection and treatment network. It will help to ensure that the wastewater generated every day in our homes, schools and workplaces is treated safely, in compliance with the EU and national wastewater treatment regulations.

Next steps

Irish Water is continuing to progress the development of this project, including licences for the wastewater discharge and foreshore works, and the appointment of contractors for construction. When these are complete, the construction stage is expected to take three years.

Dublin’s new regional wastewater treatment facility and associated drainage infrastructure will become operational from 2026 - serving the equivalent of half a million people living and working in this area into the future.

Contact the GDD project team