I am a property owner in NSW, and have a shared sewer line and boundary trap with a neighbour. There is a section of this sewer line which only my sewage flows, before connecting to the shared line. The sewer line under discussion is entirely on their property.
The neighbour has elected to take a quote for replacing the boundary trap and sewer pipe, accepted the quote, and begun work.
After work had begun, they contacted me and another neighbour to request that we share 3 ways in the costs.
My questions are as follows:
1) I have received advice that anything on the owner's land is their own legal property, and their responsibility. This includes that section of the sewer line coming from my property which is unshared.
Can anyone offer insight whether this statement is accurate?
2) Does the neighbour have the legal right to cut off my access to the sydney water mains sewer by capping my sewer pipe at their end, if we cannot reach an agreement which they are satisfied with?
3) Considering they have taken a quote and begun work without consulting any other parties, do they have any legal recourse to recoup these costs if a cost sharing arrangement cannot be reached?
Essentially, I wish to know my rights, and my legal responsibilities.
I have the intention to make a financial contribution, but need to know my rights and responsibilities in order to have an informed conversation about finances.
Edit: situation clarified through speaking to a trusted friend of the family who is a plumber, details in reply to altomic below.
Input from others with similar experience, plumbing or legal backgrounds is of course still very welcome, and received with thanks.
My bet is when the crap start blocking up the pipes then you'll start to pay.