Uisce Éireann has confirmed that permanent upgrade works will take place at the Cavan Hill Water Treatment Plant following the success of a pilot study to address water discolouration issues affecting customers in Dundalk and surrounding areas.

The Cavan Hill supply has been subject to seasonal discolouration, mainly caused by elevated levels of naturally occurring manganese in the raw water during summer months. In 2024, Uisce Éireann carried out a pilot study using specialist filters designed to remove manganese, which resulted in a significant reduction in levels and paved the way for a full-scale upgrade.

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Uisce Éireann's Ian Walsh said the company is preparing to move into the construction phase of the project in 2026.

"We are delighted to confirm that the Cavan Hill Water Treatment Plant Upgrade will move forward in 2026.These works will ensure we can deliver long-term improvements to water quality for the communities served by Cavan Hill. The design of the project has been progressing since the pilot proved successful, so once procurement of a contractor is complete, we will be in a good position to start the works and deliver for our customers."

Alongside the upgrade plans, Uisce Éireann has continued to roll out a targeted flushing programme across the network, which has already led to a reduction in discolouration reports.

James O'Hagan, Water Network Operations Manager, said: "The proactive flushing programme has been hugely successful, with a significant reduction in discolouration reports this year. We are committed to maintaining these improvements and will continue to proactively manage the network to ensure the highest water quality for our customers."

The contract for the upgrade works is expected to be awarded early this year, and Uisce Éireann has pledged to keep stakeholders informed as the project progresses.