Nenagh Wastewater Treatment Plant Upgrade

Uisce Éireann has commenced an upgrade of Nenagh Wastewater Treatment Plant.

Uisce Éireann has commenced a €49m upgrade to the wastewater treatment plant in Nenagh, Co. Tipperary. The project is designed to meet the wastewater treatment needs of the north Tipperary town for the next 30 years.

The upgrade will support future sustainable growth and development in the area, while also ensuring compliance with wastewater discharge regulations and improving the quality of treated wastewater being discharged into the Nenagh River.  

The upgraded wastewater treatment plant will bring benefits to the area including:  

• Increase the capacity of the plant to serve a population equivalent (pe) of 19,800, up from the current 12,000 pe, accommodating future population growth of the surrounding areas.
• Improving water quality in the Nenagh River.  
• Enhancing local amenities and a platform for social and economic development.
• Ensuring compliance with the Urban Wastewater Treatment Directive and EPA Wastewater Discharge Licence. 
   

The upgrade works carried out as part of this project will involve:

• Construction of a new inlet pumping station  
• Modernisation of treatment processes (preliminary, secondary, and tertiary).   
• Installation of new stormwater holding tanks with a total volume of 3,000m³.  
• New Ferric dosing plant, sludge import system with centrifuges.  
• Refurbishment of the control building, installation of a new ESB substation and permanent site generator, and site-wide flood protection and attenuation.  
   

This project forms part of Uisce Éireann’s ongoing investment programme across County Tipperary, focused on upgrading wastewater infrastructure to protect rivers, support housing delivery and enable balanced regional growth. EPS is carrying out the works on Uisce Éireann’s behalf.