The plant was originally constructed in the late 1970’s with a design P.E. of 107,650. The plant is located on the outskirts of Kilkenny City in an area of mixed residential, rural and industrial uses, and treats wastewater arising from Kilkenny and its environs. In more recent years, there have been difficulties in dealing with shock loads on the plant, highlighting a need for an upgrade to the system to increase the capacity and efficiency of the plant. The plant consisted of two aeration ditches which have both aerobic and anoxic areas to allow for both nitrification and denitrification to occur. Each aeration ditch has a capacity of 7,608m3.