Blue- green algae prompts bathing alerts at two NI beaches

Blue- green algae prompts bathing alerts at two NI beaches

Bathing alerts have been issued on two north coast beaches due to high levels of blue-green algae, leaving swimmers disappointed. Downhill and Portstewart beaches have been affected, with swimming not permitted until further notice. While increased levels of algae have also been detected at Castlerock beach, a bathing notice has not yet been put in place.

Nicole Morelli, a member of the Menopausal Mermaids open water swimming group, expressed her disappointment at not being able to enter the water. Despite a great day out recently, they understand the importance of safety precautions. The Department of Agriculture, Environment and Rural Affairs confirmed the algae presence after monitoring Magilligan, Downhill, and Portstewart strands on September 22, 2025.

The National Trust, managing Portstewart Strand, issued a warning against swimming due to the algae being at a red alert level. Visitors are advised to avoid any algae scum or mats on the shore and keep pets away from the water. Blue-green algae has been a persistent issue in Lough Neagh throughout the summer, with recent weather conditions causing portions of the algal mats to travel to the North Coast. This marks the second incident of algae-related bathing alerts, with a previous ban at Benone being lifted shortly after being put in place.

The Causeway Coast and Glens council has urged beach users to remain vigilant for blue-green algae presence at Downhill and Castlerock beaches. Precautions include avoiding contact with algae scum or mats, preventing animals from drinking contaminated water, and refraining from swimming, fishing, or engaging in water activities. It is essential for pet owners to keep their animals away from the water, especially at this stage where increased vigilance is required at Castlerock beach

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