Irish Water will carry out site investigation work in the Tolka Valley beginning Monday, 27 June for a proposed project with an investment of over €30m which will help prevent uncontrolled overflows to the River Tolka and flooding in Mulhuddart.

The investigation work will commence along the proposed route of the 9 C Sewer Duplication Project (Blanchardstown Regional Drainage Scheme), from Monday, 27 June. The site investigation work will inform the design, construction methods and contribute to the environmental reports for the project. Local access along the route of the site investigation works will remain open at all times.

Irish Water will invest over €30 million in the project to construct, 3.2km of pipeline, construction of underground storage tanks to increase capacity in the network and a new pumping station and a control building. The site investigation works will be carried out by Causeway Geotech Limited, and are expected to take approximately six weeks to complete. The works will involve trial hole excavations, borehole drilling and geophysical mapping. A resident ecologist will be present on site during the work.

This investment is required as the current wastewater infrastructure is currently under capacity for the area which can cause extensive flooding at Mulhuddart and the project will support current and future development in Blanchardstown and the surrounding areas.

Irish Water intends to submit a planning application for the proposed project by the end of the year. Once submitted, the planning application may be inspected at the offices of the Planning Authority (Fingal County Council) and accessed online at


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