Prerequisites
You have discovered a malfunction in the public sewage system.
Documents required
Please note
You can use the transfer shaft or cleaning opening on your property to check whether the wastewater is still draining properly and whether the problem is actually in the public sewage system. A transfer shaft is usually located on the property line. If there is development along the property line, the cleaning opening is located inside the building (for example, in the basement or utility room).
If the affected drainage system is located on your property, you are responsible for rectifying the problem yourself.
Deadlines
To avoid damage, report any malfunction as soon as possible.