Public warning issued over Lough Derg algae bloom
This is not the first time such a warning has been issued, as a similar problem was also reported in September 2025
Tipperary County Council has issued a warning to the public, of the dangers presented by the presence of Algal Bloom which has appeared on Lough Derg in recent days.
The Blue-green algae bloom can produce harmful toxins, say the council, and is most easily recognised when it forms a bright pea-green paint-like scum on or close to the shoreline.
“The public are advised to please exercise caution.
“Contact with this bloom should be avoided as it may cause skin irritation.
“Keep all animals, especially dogs, away from the affected area and ensure they have an alternative source of drinking water.
Inspections this week show significant blooms on areas of Lough Derg, reported the local authority, who issued the warning in consultation with the HSE.
The public advisory is effective immediately until Monday, 28th September 2026.
For more information or concerns, please contact the Environment & Climate Action Section at Tipperary County Council at 0818 06 5000.