Arklow Wastewater Treatment Plant

Arklow has been identified by the Environmental Protection Agency (EPA), as an area where wastewater is discharged into the Avoca River without any treatment. This practice of discharging untreated wastewater to the river is no longer acceptable and Uisce Éireann intends to fix this problem in partnership with Wicklow County Council.

The provision of a new wastewater treatment plant in Arklow will bring benefits to the town and surrounding areas in terms of health, environmental protection and improved water quality for all.

Project Objectives

Arklow Wastewater Treatment Plant must be delivered in a way that not only meets the required legislative standards but that also ensures that all works are undertaken in a safe and environmentally responsible manner, in cooperation with the local community.

The objectives of the Arklow Wastewater Treatment Plant project are as follows:

• To stop the current practice of discharging untreated wastewater to the Avoca River
• To provide a wastewater treatment facility that will comply with all relevant legislative requirements and will service the population of Arklow into the future
• To improve water quality in the Avoca River

What is involved?

The Arklow Wastewater Treatment Plant project includes:

• A new, state of the art, wastewater treatment plant that has been designed to provide an ultimate treatment capacity for a PE (population equivalent) of up to 36,000 at the Old Wallboard Factory, North Quay, Ferrybank
• Sewer pipelines (along the North and South Quays) to bring the untreated wastewater to the WwTP
• A marine outfall pipe to safely discharge the treated wastewater to the Irish Sea

Stakeholder Engagement

Who can I contact if I want to find out more about this project?

Members of the public are welcome to contact the Project Team if they have any questions on the Arklow Wastewater Treatment Plant Project and can do so in the following ways:

Email: Arklowtp@water.ie  

Web: www.water.ie/arklow

A dedicated Community Liaison Officer has been appointed for the duration of this project. If you require further information regarding the works, please contact the project team or Ward and Burke Water Ltd on 086 1036300.

Progress Update:

Underground tunnelling

Works to the sewer network (along the North and South Quays) are approximately 80% complete, with around 1.8km of new sewer installed.

In March 2022, tunnelling works commenced using a specialised Tunnel Boring Machine (TBM) to make way for the new sewer pipelines along the North and South Quays, and under the River Avoca. These tunnelling works are now complete. Some pipelaying and piling will continue until Q1 2024, at which point the new sewer network will be complete and works will be confined to the new Wastewater Treatment Plant Site.

Check out some images of the Tunnel Boring Machine as it was launched into the newly constructed shaft at the Ferrybank Roundabout:

Long Sea Outfall:

The long sea outfall pipe will safely discharge the treated wastewater to the Irish Sea when the new wastewater treatment plant is operational. This new pipe was brought by boat from Norway in recent weeks and was installed along the seabed over Summer 2022 using specialised equipment and marine vessels.

The long sea outfall pipe comprises of a HDPE pipe with an internal diameter of approximately 630 mm. Six vertical diffusers will emit the effluent approximately 900 metres out to sea at a depth of approximately 10 metres below sea level. Flow through the long sea outfall pipe will be via gravity.

Check out some images of the arrival of the outfall pipe from Norway along with the specialise dredger which will help install the outfall pipe at sea: