Certificates of management systems
| Company | Certificate | Status |
|---|---|---|
| Water Supply and Sewerage Ltd | ISO 9001:2015 | valid |
| Water Supply and Sewerage Ltd | ISO 14001:2015 | valid |
| Water Supply and Sewerage Ltd | ISO 45001:2018 | valid |
| Waterbuild Ltd | ISO 14001:2015 | valid |
| Waterbuild Ltd | ISO 45001:2018 | valid |
| Waterbuild Ltd | ISO 9001:2015 | valid |
| Wavin Hungary Kft. | ISO 9001:2015 | valid |
| Wavin Hungary Kft. | ISO 14001:2015 | valid |
| WAY INDUSTRY, a.s. | AQAP 2110:2003 | expired |
| Wazoogles Superfood | FSSC 22000:51 | valid |
| WBB s.r.o. | ISO 9001:2008 | expired |
| WCP ENGINEERING & TRADING PTE. LTD. | ISO 9001:2015 | withdrawn |
| WE Trade s. r. o. | FSSC 22000:4 | expired |
| Wéber Villany Kft. | ISO 14001:2015 | valid |
| Wéber Villany Kft. | ISO 9001:2015 | valid |
| WEBTECH ENGINEERING (P) LTD. (UNIT II) | ISO 9001:2008 | withdrawn |
| WEBTECH ENGINEERING PVT. LTD. | ISO 9001:2008 | withdrawn |
| WEBTECH ENGINEERING PVT. LTD. | ISO 9001:2008 | withdrawn |
| WEBTECH INTERNATIONAL LIMITED | ISO 9001:2000 | withdrawn |
| West Service Ltd | ISO 9001:2015 | valid |