Hello we bought a house about 2 years ago with a septic tank. The septic tank is shared with our neighbours. It is on the land that belongs to the family of the previous owners but we own the tank. The tank is leaking on to a footpath and environmental health have been in touch. We need to sort it out urgently. We can't connect to the mains. We can't repair or replace the septic tank as it's too close to a river and from 2020 you must replace it with a water treatment plant as per environment agency. The field the tank is in backs on to a footpath this is where the tank is leaking on to. We have access on the footpath but do not own it. We need to put a pipe for new water treatment plant under footpath to river. What do we do if we canot get permission from the footpath landowner to do this. Due to the lie of the land we cannot have a soak away. Feeling very worried. All advice welcome.