News & Updates

The Cork Lower Harbour Main Drainage Project, is now treating all wastewater from the agglomerations of Ringaskiddy-Crosshaven-Carrigaline; Ringaskiddy village; Passage West-Monkstown and Cobh town.

This means 20,000 homes and businesses are now connected to the scheme and that raw sewage from these areas will no longer be discharged into the harbour, positively impacting the local economy and greatly improving the amenity value of the Cork Lower Harbour for the surrounding communities.

Passage West, Glenbrook, Monkstown

Wastewater from Passage West, Glenbrook and Monkstown now no longer discharges untreated to Cork Harbour. The sewer network has been extended as part of the Cork Lower Harbour Main Drainage Project to connect these area to the Shanbally Wastewater Treatment Plant.

For queries on the completed works at Passage West, Glenbrook and Monkstown, please email the project team at

Cobh Networks Contract

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Raw sewage from Cobh Town is now treated before its safe discharge to sea.

Irish Water, working in partnership with Cork County Council, have since 2019 worked to deliver the Cobh Networks Contract – the last step in the Cork Lower Harbour Main Drainage Project. Farrans Sorensen Joint Venture (FSJV) is working on behalf of Irish Water to deliver this project.

The Cobh Networks Contract, has expanded the sewage network in Cobh Town by building 7km of sewer pipes and 5 pumping stations so that water is now pumped to Cork Dockyard Pumping Station.

The opening of the Cork Dockyard Pumping Station marks the end of the raw sewage discharge in Cobh Town.  

From Cork Dockyard Pumping Station raw sewage is pumped under the Lee Estuary to Monkstown and on to Shanbally Wastewater Treatment plant for treatment before its safe return to sea.

This important milestone means that the overall project is now treating 40,000 wheelie bins of raw sewage daily before its safe discharge into the sea and 20,000 homes are now connected to the new scheme.   

Final works including finishing, reinstatement and decommissioning works will continue in the coming months.

Cork Lower Harbour Main Drainage Project – The Journey – video here.

Cobh to Monkstown - Estuary Crossing Contract

In December 2020, Irish Water completed the Cobh to Monkstown Estuary Crossing Contract.  This Contract was part of the Cork Lower Harbour Main Drainage Project, where Irish Water is working, in partnership with Cork County Council, towards ending the decades-long practice of discharging raw sewage directly into Cork Lower Harbour.  

This landmark engineering feat involved two of the longest horizontal directional drills ever carried out in Ireland under the Lee Estuary. These drilled bores allowed the installation of sewer pipelines 60m under the Lee Estuary – creating a vital connection between Cobh and Monkstown. This connection will allow the raw sewage from Cobh town to be transferred for treatment, once work on the Cobh Town Networks contract is complete in 2021.

In addition, O’Connor Utilities Limited, working on Irish Water’s behalf, has won the inaugural Ervia Major Projects Contractor Safety Award for the safe delivery of this contract.

Irish Water would like to particularly thank the local community for their support. Their patience and cooperation with our contractor, O’Connor Utilities, in partnership with Long O’Donnell, Nicholas O’Dwyer and our own Irish Water project team, has greatly contributed to the safe and successful completion of these works.

Monkstown Park, the HDD drill reception site during construction, has been reinstated with a new surface and multi-use games area to the basketball court, additional drainage to the levelled and reseeded football pitch, and a new wildflower area and bug hotel.

The bug hotel has been constructed using sections of the pipe type that has been installed under the Estuary, to represent how these pipes are working underground where we cannot see them – bringing raw sewage for treatment, leading to better water quality in the sea at Monkstown and all the Cork Lower Harbour area - improving the environment we all live in.

Contact us

You can email the project team with any queries at  

Irish Water is committed to delivering these works with the minimum disruption to residents and businesses and to working with the local community to minimise the impact where possible.

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