Mayo Wastewater Treatment Plants Upgrades

Wastewater Project

Upgrading the wastewater treatment plants across Mayo as part of a €1 million investment.

Irish Water, working in partnership with Mayo County Council, is investing €1 million to undertake essential upgrade works to wastewater treatment plants in towns and villages across Mayo. These improvement works include upgrades to the inlet works, storm water management and sludge treatment and storage facilities.

As part of the project, upgrade works are proposed to be completed in Ballindine, Ballycastle, Gweesalia, Shrule and Mulranny.

€1 million


  • Upgrade existing infrastructure at the plants and provide new elements where defects identified
  • Improve the performance of the wastewater treatment process
  • Prolong the operational life of the existing plant
  • Reduce the risk of storm water flooding
  • Ensure compliance with Urban Wastewater Treatment Regulations 2001


  • Upgrade the inlet works at the plants, which includes the provision of inlet screens, grit removal and flow control, where applicable
  • Construct storm water holding tanks for the plants, if required
  • Upgrade the sludge storage, thickening and dewatering facilities at the plants, where applicable
  • Works will be carried out within the footprint of the plants therefore minimising disruption to residents and businesses in the surrounding area