North City Arterial Main (NCAM)

Uisce Éireann is progressing works to install a strategic trunkmain servicing the northern area of Dublin City.

Uisce Éireann is installing 5.5km of strategic trunkmain in the Clontarf area of Dublin City and neighbouring Fingal area as part of the North City Arterial Main (NCAM) project.

Once complete, the NCAM will be a critical piece of infrastructure for cross city water transfers between reservoirs in Ballymore Eustace and Leixlip.

This project will involve the construction of two separate trunkmains at the following locations:

• James Larkin Road/Dublin Road between Causeway Road and Bayside Boulevard South Junction, including Greendale Road and Thornville Road
• Clontarf Promenade between Hollybrook Road and The Woodenbridge

These new trunkmains will be connected with existing mains between Fairview Park and Hollybrook Road and the Woodenbridge and Causeway Road to complete the NCAM scheme.

This project is critical to ensuring a secure and reliable drinking water supply to homes and businesses in North Dublin. It is a key project to help realise Government’s proposed target of 300,000 homes by 2030.
When complete, this project will support social and economic growth in North Dublin city.

• Enable the delivery of 12,000 new homes in the North Dublin area.
• Reduce interruption to supply to 160,000 properties.
• Improve pressure and resilience to 29,000 existing homes between Clontarf and Howth Head.
• Protect old/brittle mains in Clontarf/Donnycarney. 

Completion of the North City Arterial Main Scheme will link supplies at Leixlip and Ballymore Eustace Water Treatment Plants for customers in North Dublin, providing greater resilience and security of supply.

The first phase of the project will enter construction in mid-February 2026. Works will be focused in the area of the Causeway Road to Bayside Boulevard South, including Greendale Road and Thornville Road. GMC Utilities Group is delivering this project on Uisce Éireann’s behalf.

Works will include:

• 2.5km of watermain along James Larkin Road/Howth Road/Dublin Road.
• 1.1km of watermain along Greendale Road and Thornville Road to Kilbarrack Parade.

Traffic management is be required as part of the project.

GMC will commence works along the James Larkin Road with the following traffic management arrangements in place:

• The Southbound Lane on James Larkin Road will be closed to safely facilitate works in the area.
• The lane closure period extends from Monday, 16 February 2025 for a period of 18 weeks. The lane closure will be in place 24hours/day, 7 days a week for the duration of works. Standard working hours are 8am to 6pm Monday to Friday with weekend works as required.
• Diversions will be in place via Howth Road and Watermill Road.
• Access for residents and property holders and emergency access will be facilitated throughout the closure period.

Once this section of the works is completed, construction activities on the remaining sections will continue under a traffic management stop/go system.

Uisce Éireann is actively engaging with key stakeholders and the local community and will continue to do so throughout the project. GMC Utilities Group has a dedicated Community Liaison Officer (CLO) who can be contacted on 085 8541594.

We would like to thank the local community, for their patience and ongoing support while we continue to deliver water services for Ireland for the benefit of current and future generations.

Works on the Clontarf Promenade between Hollybrook Road and The Woodenbridge are expected to commence in 2027.

Details of any planned supply interruptions associated with this project will be updated on the Water Supply Updates section of the Uisce Éireann website and stakeholders affected will get advance notice.