Blanchardstown Regional Drainage Scheme

Why is the project needed?

Irish Water is progressing the delivery of the Blanchardstown Regional Drainage Scheme (BRDS). The project represents an investment of approximately €88 million by Irish Water and will involve the upgrade of the existing sewer network currently serving Blanchardstown, Mulhuddart and Castleknock as well as a number of towns in Meath including Dunboyne, Clonee, Ashbourne and Ratoath.

The proposed is needed to:

  • Expand the capacity of the wastewater network and will facilitate existing and future residential and commercial development
  • Enable the long term social and economic development of the greater Blanchardstown region and surrounding areas including Meath
  • ​Reduce the frequency and volume of untreated wastewater overflows from the wastewater network to the River Tolka, protecting habitats and ecosystems in the River Tolka and Dublin Bay
What is involved?

What is involved?

  • The construction of approximately 3.2km of pipeline installed using trenchless tunnelling techniques alongside the existing wastewater network.
  • The construction of an underground storm water management facility, with a capacity of approximately 30,000m³.
  • The provision of a below ground pumping station with above ground control room (Tolka Valley Park Pumping Station).
  • A control building to house all electrical switchgear, control equipment, an odour control unit, a generator room and ESB sub-station.
  • Local water, wastewater and utility infrastructure diversions to facilitate construction of the stormwater management facility and Tolka Valley Park Pumping Station.
  • The reinstatement of construction areas to match the original condition and associated site works.

Where will the project take place?

The scheme will be located alongside the Tolka River Valley in Blanchardstown between Parslickstown and Mill Road. The route will be adjacent to the existing 9C wastewater network. The pumping station will be located at Waterville Park close to Mill Road.

Will public access to the Tolka Valley Park be affected?

During the proposed works access to the park will be maintained and every effort will be made to minimise any disruption in the Tolka Valley and the surrounding areas as follows:

  • The new pipeline will be installed by tunnelling, which will limit the area required to construct the new pipeline in comparison to construction by open-cut technique.
  • Traffic Management Plans and temporary pedestrian routes will be in place to maintain access to Tolka Valley Park throughout the duration on the works, except for the construction areas, which will be segregated from the general public for health and safety reasons.

Next steps

The project will take approximately 36 months to complete. Access to the park will be maintained throughout the duration of the project, however access to working areas will be restricted and hoarding will be erected around the working areas to ensure the safety of staff and park users.

Signage will also be provided at Waterville Park entrances to advise park users of the pedestrian access routes which will be closed temporarily. The working areas have been developed to minimise the footprint of any construction work in the park and in order to maintain access to the park. View the map of the individual working areas. 

The Project Team will notify the local community in advance of works commencing and will provide contact details should they have any questions regarding the works.

More information

Frequently asked Questions

View our list of Frequently Asked Questions for the Blanchardstown Regional Drainage Scheme. 

Contact us

If you have further queries or comments about this project, you can contact our Project Team by emailing

More information
Back to the top