Who's responsible for the leak in the upstairs toilet that flows to our house?

First of all, when you go to his house, it should be called discussion or theory, not complaining.

Complaints are generally made to the relevant administrative departments.

You should do the following:

1, take photos from multiple angles immediately, and take pictures of the water leakage point, the situation during the water leakage and the damage after the water leakage.

2. Find the property management company in your community to coordinate the members of the owners' committee or relevant personnel of the neighborhood committee.

3. If their toilets are not decorated and the surface is not obviously damaged or damaged, then the property and development company is responsible for the maintenance.

4. If their toilets have been renovated, the property maintenance personnel should help find the leaking point. If it is a renovated sewer, their home is responsible for maintenance. If it is a pipeline in a public area, or a property and development company is responsible for maintenance.

5. If they don't agree to the maintenance or even the inspection, you can only sue him in court if the mediation between the property, the owners' committee and the neighborhood committee fails. At this time, the photos you took, the minutes of the coordinated meeting, and the text messages are all material evidence. The coordinator is a witness.