| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Arcrite Ltd | 03511397 | 01/04/2005 | Dissolved |
| Arcrite Membrane Systems Ltd | 03262932 | 01/04/2005 | Dissolved |
| Arcrite Process Systems (U K) Ltd | 03257842 | 01/04/2005 | Dissolved |
| Arcrite Water Services Ltd | 03220650 | 01/04/2005 | Dissolved |
| DLJ WATER LIMITED | NI669884 | 01/06/2020 | One Red Flag |
| JACOPA LIMITED | 09352099 | 12/01/2015 | Bronze |
| JACOPA-DEANE GROUP LTD | NI669889 | 01/06/2020 | One Red Flag |
| Minworth Systems Ltd | 02319641 | 01/04/2005 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| AZTEC ENVIRONMENTAL CONTROL LIMITED | 01361365 | 01/04/2005 | 31/03/2007 | Dissolved |
| BRITISH WATER | 03953229 | 14/06/2006 | 31/07/2007 | Gold |
| DE NORA WATER TECHNOLOGIES LIMITED | 08089317 | 30/05/2012 | 28/03/2013 | One Red Flag |
| DE NORA WATER TECHNOLOGIES UK SERVICES LIMITED | 01254271 | 01/04/2005 | 31/03/2007 | Bronze |
| GEDA AND JACOPA LIMITED | NI071456 | 17/01/2014 | 14/06/2022 | Dissolved |
| OVIVO UK LIMITED | 00104655 | 15/04/2013 | 27/02/2015 | Amber |
| PROCIS SOFTWARE LIMITED | 02186524 | 12/09/2006 | 31/03/2007 | Dissolved |
| SEVERN TRENT SYSTEMS LIMITED | 02394552 | 12/09/2006 | 31/03/2007 | Dissolved |
| TETRA EUROPE LIMITED | 02648443 | 01/04/2005 | 31/03/2007 | Dissolved |
| WATER PLUS SELECT LIMITED | 03511659 | 15/05/2007 | 20/03/2008 | Amber |