Co Donegal has one of the worst standards of drinking water quality in Ireland

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.