Plan Do Check Act Plan Do Check Act

About us


ISO certificate

DHZ AG received the initial certification of the management systems quality (ISO 9001), environment (14001) and occupational safety (OHSAS 18001) in May 2014.

In the summer of 2020, DHZ AG was recertified and, at the same time, Zürcher Kies und Transport AG was successfully recertified for the first time under the stefan eberhard ag (sehag) group. The certification audit was carried out by the Swiss Safety Center AG.

DHZ AG has the following ISO certifications within the sehag group:

  • Quality Management System (QMS): ISO 9001
  • Environmental Management System (EMS): ISO 14001
  • Health and Safety Management System (SGA): ISO 45001

ISO certificate