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06 Sept 2025

Uisce Éireann comments on presence of algae in Blessington Lakes

Uisce Éireann has commented on the most recent occurrance of algae at Blessington Lakes.

It follows after photographs emerged showing blue-green coloured algae at the reservoir earlier this week.

When asked for a statement by the Leinster Leader, Uisce Éireann said: "The raw water supply to Ballymore Eustace Water Treatment Plant is taken from Poulaphouca Reservoir (Blessington Lakes), and is monitored continuously via 24/7 instrumentation, a laboratory sampling program and visual inspections of the reservoir.

"Further quality analysis and checks take place through each step of the treatment process and in the distribution network to ensure the water supplied to customers is safe to drink."

The organisation added: "Algae blooms do periodically occur for a variety of reasons, but do not typically impact the treatment process at Ballymore Eustace Water Treatment Plant."

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