The GDD project will safeguard public health, protect the environment and facilitate social and economic growth to 2050 and beyond

Irish Water is undertaking an information campaign on the Greater Dublin Drainage Project (GDD) to give people an update on this vital project that will safeguard public health, protect and improve the environment and allow for social and economic growth for future generations to 2050 and beyond. Once operational the GDD will have the capacity to provide wastewater treatment for half a million people in Dublin and parts of Kildare and Meath.

Census 2016 recorded population growth rates in the Greater Dublin Area well in excess of the national average. As the 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.

To meet this demand, the GDD project will include the development of a new regional wastewater treatment facility at Clonshagh (Clonshaugh) and associated infrastructure including new sewer pipes, a pumping station, an outfall pipe and a regional biosolids storage facility which will serve the population of Dublin and parts of the surrounding counties of Kildare and Meath.  The GDD project will ensure that the wastewater generated each day in our homes, schools and workplaces will continue to be treated effectively and safely up to 2050 and beyond.

Additional wastewater treatment capacity will be needed in greater Dublin once the country’s largest wastewater facility at Ringsend is upgraded to its maximum capacity by the mid- 2020s.

The GDD project includes:

  • a new regional wastewater treatment facility on a 30 hectare site at Clonshagh (Clonshaugh);
  • an underground orbital sewer from Blanchardstown to Clonshagh (Clonshaugh) including a new pumping station at Abbotstown;
  • a sewer to divert part of the North Fringe Sewer to the new treatment facility;
  • an outfall pipe from the wastewater treatment facility discharging the treated water to the Irish Sea; and
  • a regional biosolids storage facility located at Newtown/Kilshane, Dublin 11.

According to Jane Chambers, Irish Water GDD Project Manager, “Dublin has been largely reliant on the Ringsend facility since 1906 for the treatment of wastewater. The GDD project represents the next major step in the development of the wastewater infrastructure network for Dublin and the surrounding counties. This is a once in a generation project which has the capacity to safeguard public health, protect and improve our environment and allow for the growth and development of new homes and businesses. Anyone interested in the GDD project is welcome to come along to our forthcoming information events to learn more about this vital piece of wastewater infrastructure.”

Irish Water is holding three public information events for the GDD project as follows:

Tuesday 21 November:             Portmarnock Hotel and Golf Links,  2pm – 8pm

Monday 27 November:              National Sports Campus Conference Centre, Abbotstown, 2pm – 8pm

Wednesday 29 November:       Hilton Hotel, Northern Cross, 2pm – 8pm

Irish Water is sending information on the GDD project to residents and businesses in proximity to the proposed infrastructure and a project newsletter can also be downloaded from

Irish Water intends to make a planning application for the GDD project to the independent planning authority, An Bord Pleanála, in 2018. Following submission of a planning application for GDD in 2018, a period of statutory public consultation will be carried out by An Bord Pleanála.

Subject to planning permission, construction of the GDD wastewater treatment plant and the associated orbital sewer, pumping station and marine outfall will take at least three years and will begin in 2021. It is intended that the new regional wastewater treatment facility and associated infrastructure serving the population of greater Dublin will become operational from the mid-2020s.

Irish Water will liaise closely with local communities throughout construction and all works will be undertaken in a safe and environmentally responsible manner. The GDD project will be designed, built and operated to the highest standards so that our wastewater can be collected, treated and safely returned to the environment into the future.


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