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06 Sept 2025

Council says shoreline water quality issues caused by ‘organic matter’ 

Donegal County Council said it had received a number of queries about water quality issues at various locations in the past week which  involved scum on the surface of the water and shoreline

Council says shoreline water quality issues caused by ‘organic matter’ 

Inch was one of the locations where there were complaints of water quality issues

Water quality issues at parts of Inishowen’s coast in recent days have been caused by “decaying organic matter," Donegal County Council has said.

The local authority has received a number of queries about water quality issues at various locations around the Donegal coast in the past week. 

Members of the public, including swimmers, reported suspended material which leaves a scum on the surface of the water and shoreline. 

In a statement issued on Friday, the council said its environment section had carried out tests which concluded “that the material is derived from decaying organic matter, such as seaweed and marine plant debris, which has been dislodged and is accumulating in sheltered areas due to the current dry, calm conditions”. 

The water quality issues have been reported at  Malin Head and on Lough Swilly at Ludden, Ned’s Point and  Inch. The council said the issue has cleared up in a short space of time at most locations, usually one or two days.

“The material has also been identified at these locations in previous years and appears to be a seasonal issue,” the council said.

The Council’s routine monitoring of designated bathing waters will start when the official bathing season begins in the first week in June.

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