Membership group 1

Business and public institutions that establish and/or maintain drains and sewers and perform these activities as their own service. Public institutions and engineering firms that tender for the assembly and/or maintenance of drains and sewers and/or monitor their construction and perform these activities as their own service.

Membership group 2

Contracting authorities, institutions and persons who represent the corresponding business and commercial groups if the Association recognises that they have a legitimate interest in quality assurance.

Membership group 3

Sponsoring companies, institutions and persons who cannot be included in either group 1 or group 2 and do not have the right to vote in the Members' Meeting.