Rücken & Partner - ENGINEERING
- Association of Water, Waste Management and Cultural Construction (BWK)
- Association of Road and Traffic Engineers in Lower Saxony (VSVI)
- German Association of Water, Waste Water and Waste (DWA)
- Chamber of Engineers in Lower Saxony (personal membershipgs of Dipl.-Ing. Ansgar Winkeler and Dipl.-Ing. Ulrich Bednarzick)
- German Association of Consulting Engineers (VBI) (personal representative: Dipl.-Ing. Wilfried Schwarte)
- Architectural Association in Lower Saxony (personal membership of Dipl.-Ing. Arch. Silke Gebbeken and Dipl.-Geogr. Andrea Büring)
- Business Association Emsland
- Association of German Engineers (VDI) (personal membership of Peter Schleevoigt)
- German Technical and Scientific Association for Gas and Water (DVGW) (personal membership of Peter Schleevoigt)