Den Ouden heeft verschillende certificaten en goedkeuringen om aan de normen te voldoen.
ISO 9001 Quality Management System (QMS); EN
ISO 9001 Quality Management System (QMS); NL
ISO 14001 Environmental Managenment (EMS); EN
ISO 14001 Environmental Managenment (EMS); NL
Control Union Certifications EN; CE
Control Union Certifications EN; NOP (USA)
Soil Association Approved: Certificate of Registration
Soil Association Approved: Trading Schedule
Easy-Cert Services; Bio-Austria; Confirmation
Easy-Cert Services; Bio-Austria;
Easy-Cert Services & Die Umwelt Beartung; „biologisch gärtnern
Den Ouden Organic Sterksel - volwaardig KA Vlaco