A 'Do Not Swim' notice has been put in place until Wednesday

Noxious blooms covered large parts of Lough Neagh last summer, and also affected other waterways and beaches in the region.

The Court of Justice of the EU ruled the concentration of trihalomethanes in a large number of public drinking water supplies in the Republic have persistently exceeded recommended safety limits

The action is fully contested by the State and opposed by the Irish Farmers’ Association and the Irish Creamery Milk Suppliers Association