Denis O'Donovan (Fianna Fail)

What is the position if a landowner has a septic tank, a waste water treatment plant or a percolation area on his land but there is no house on the land? Is the landowner responsible? I have come across an instance where, 30 to 40 years ago, the person who built the house was allowed put the percolation area or the septic tank on a neighbour's land, but the situation has since changed and there is no co-operation. The septic tanks is on Mr. X's land but Mr. Y owns the house. Who is responsible? I presume it is the landowner because he will not allow the man who owns the house to go in and desludge it or fix it. It is a moot point.