The E Ballygowan sources is located within ancient carboniferous limestones of south west limerck, Ireland. The water of the source emerges at the surface from a Well that is over 235 metres (770 feet) deep. Scientific studies have shown that this water can take up to 750 years to percolate through the 355 million year old limestones and dolomite fractures and joints before being drawn to the surface. The groundwater dissolves the minerals out of the limestones and dolomites to give Ballygowan its particular hydrochemical attributes.