Mullinahone Wastewater Treatment Plant Upgrade

Wastewater Project

Modernising and upgrading the treatment plant in Mullinahone Co. Tipperary to improve performance and ensure environmental compliance.

Irish Water, working in partnership with Tipperary County Council, is investing over €1.9 million to complete essential upgrades of the wastewater treatment plant in Mullinahone, Co. Tipperary.

Veolia Water Ireland Limited is delivering this project on behalf of Irish Water’s Capital Programmes.

This project will upgrade and modernise several elements of the wastewater treatment process at the plant, resolving plant overloading issues and ensuring compliance with Urban Wastewater Treatment Regulations. This includes the construction of new inlet works, settlement tanks and storm water tank at the plant.

€1.9 million


  • Improve the performance of the wastewater treatment process at the plant
  • Ensure compliance with Urban Wastewater Treatment Regulations 2001 and EPA wastewater discharge licence
  • Resolve odour issues at the plant
  • Improve the water quality at the stream discharge point at the Mullinahone Stream which flows into the River Suir
  • Accommodate future growth and development in Mullinahone and surrounding areas


  1. Construct a new inlet works and settlement tanks
  2. Construct a new storm water tank, to increase the plant's resilience during storm events
  3. Upgraded the flow measurement, sampling, automation and control facilities
  4. The majority of the works have been completed within the footprint of the site therefore minimising the impact to the local community