Stamullen Wastewater Upgrade Scheme

Uisce Éireann completed works on a major upgrade of the Stamullen Wastewater Scheme in July 2025, a significant project that will bring long term environmental benefits for the communities of Stamullen and Gormanston and provide capacity to enable social and economic growth.

The project involved converting the existing Stamullen Wastewater Treatment Plant into a modern pumping station, which will now transfer all local wastewater to the Balbriggan Wastewater Treatment Plant for full treatment. Approximately 6 kilometres of twin rising mains were installed, connecting Stamullen to the Balbriggan sewer network at Cardy Rock. The new network has also been designed to accommodate future wastewater flows from the nearby village of Gormanston.

With the wastewater now being transferred for treatment in Balbriggan, the decommissioning of the old treatment plant in Stamullen will mean a significant reduction in environmental impact locally. The improved network provides the capacity required to support planned development, ensuring Stamullen and Gormanston can enjoy sustainable growth.

Construction was carried out by David Walsh Civil Engineering Ltd on behalf of Uisce Éireann.