Castlemagner Wastewater Treatment Plant

Uisce Éireann is commencing works to construct a new wastewater treament plant in Castlemagner, Co. Cork with an investment of €13.4 million.

This project is being delivered as part of Uisce Éireann’s Small Towns and Villages Growth Programme. Projects in this programme are designed to support Growth and development in towns and villages throughout the country, while protecting the environment and ensuring a continued supply of safe drinking water.

The existing wastewater infrastructure dating back to the 1950’s consists of a septic tank that is designed for a capacity of 50 population equivalent (PE). A new treatment plant will be constructed increasing capacity to 500 PE, ensuring environmental compliance and providing capacity for future growth and development.  

This project is due to commence in Feburary 2026 and will be delivered by Glanua Ireland Ltd. on behalf of Uisce Éireann with completion expected in early 2028. Upon completion it will improve the capacity and performance of the existing wastewater infrastructure in the area. 

• Construction of New Wastewater Treatment Plant
• Increasing the treatment capacity from 50 to 500 PE
• Construction of a new stormwater storage system and associated incoming sewer network and pipework to limit impact of future flooding events
• New outfall to discharge treated effluent to the Lisduggan North Stream
• Sustainable sludge drying reed beds, reducing energy requirements and transport movements in the locality
• Solar ground mounted panels to provide on-site energy generation
   

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

• Improve water quality in the Lisduggan North Stream.
• Facilitate social and economic growth, including planned residential development.
• Ensure the required capacity of the wastewater infrastructure to support future development in the area.
• Improve the stormwater capacity, reducing the risk of sewer flooding in the area.
• To enhance sustainability, the wastewater treatment plant will feature innovative green solutions. Sustainable sludge drying reed beds will cut energy use and reduce transport emissions, while solar panels will generate clean, renewable energy on-site. These measures will lower reliance on fossil fuels, improve resource efficiency, support biodiversity, and create a more resilient treatment plant.
   

Construction works will be confined to a new greenfield site with minimal disruption to the community other than increased construction vehicles in the locality to facilitate the construction of the treatment plant.