If your municipality has provided for this in its drainage statutes, properties that are served by sewers of a public drainage facility must generally also be connected to and use this facility. This obligation is referred to as the so-called connection and use obligation.
The possibility of imposing such an obligation on property owners for reasons of public welfare is regulated by law in the Municipal Code (GO). Article 24, Paragraph 1, No. 2 of the GO allows municipalities (which are obligated to dispose of wastewater under the Bavarian Water Act) to fulfill this obligation by using this route. This provision forms the basis for corresponding local regulations in the municipal drainage statutes to order the compulsory connection and use.
Under certain conditions, however, property owners can also be exempted in whole or in part from the obligation to connect or use the water. The conditions for this are usually regulated in more detail in the local drainage statutes.
You can find out more about this topic from your local authority.