Co Donegal has one of the lowest standards in quality of drinking water in Ireland.
The European Commission has issued a warning to the Irish Government to improve the safety of drinking water here.
It follows recent data showing that water in certain counties has excessive amounts of a substance called Trihalomethane. The chemical is a by-product of chlorine when used to disinfect water.
Counties Donegal, Kerry and Wicklow are the worst affected.
