Monday, 10th June 2013:            Greater Dublin Drainage has published the report ‘Alternative Sites Assessment and Routes Selection Report Phase 4: Preferred Sites and Routes Report’ which identifies that the best solution for the future development of wastewater treatment capacity in the wider Dublin region comprises a 26km orbital sewer, a wastewater treatment plant at Clonshagh and an outfall pipe located 6km out to sea from Baldoyle.

Presenting the report to the Elected Members of Fingal County Council today the Project Team said that this preferred site option will be subject to further technical examination and more detailed studies over the coming months.  The full Report is available to view and download for free at It will also be on view in Fingal County Council offices in Swords and Blanchardstown, in Fingal public libraries and at Dublin City Council’s North Central Head Office in Coolock.  The Report (without appendices) can be purchased for €150.

“The Greater Dublin Drainage project is vital in order to facilitate employment, social progress and economic growth in the wider Dublin Region, hand-in-hand with the improvement and protection of our environment,” said Peter O’Reilly, Project Engineer, Fingal County Council. “Wastewater treatment capacity is one of the key elements of infrastructure needed to facilitate jobs and other developments like schools, hospitals and housing in the wider Dublin region and our current capacity will run out in 2020.”

“Over 13 different experts across different disciplines studied the three shortlisted sites, Clonshagh, Annsbrook and Newtowncorduff, and we reached the conclusion that Clonshagh is the most environmentally beneficial and technically advantageous solution and it is the best value for money too,” said Peter O’Reilly.

The Clonshagh option is better ecologically and environmentally.  Tunnelling of the preferred outfall is technically easier and the outfall location has a greater depth of water to facilitate greater initial dilution of treated wastewater discharges in the sea than the northern outfall; it has the shortest pipeline and therefore a shorter construction time; and it is closest to the existing areas where wastewater is drawn from and so will be more flexible in serving schools, hospitals, houses and industry immediately as well as enabling additional capacity. In addition to the many technical and environmental benefits, the estimated overall cost during the lifetime of the project for this preferred site option is over €80 million less than other options studied.

Fingal County Council is delivering Greater Dublin Drainage on behalf of the wider Dublin Region.  It intends to submit an application for planning approval to An Bord Pleanala in early 2014 and at that stage the Board will undertake statutory public consultation.

In advance of that, the Project Team is preparing an Environmental Impact Statement (EIS) and is holding public consultation over the next eight weeks to seek feedback on what should be considered in the EIS.  Open days are being held in Fingal County Council, County Hall, Swords on 26th and 29th June and on 3rd July.

For more information people can contact the project team at or by Lo-call telephone 1890 44 55 67.


Fingal County Council commenced Greater Dublin Drainage in 2011.  Following initial studies it identified nine land parcels which, following extensive technical studies and public consultation, were narrowed down to three possible site options.  Until planning approval is obtained for this preferred site option, Annsbrook and Newtowncorduff will continue to be possible options for the project should Clonshagh be deemed unsuitable at any future stage.