| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Biwater-O T V Ltd | 02313421 | 17/05/1992 | Dissolved |
| Buy-In Investments Limited | 02507167 | 08/10/1991 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| AMES CROSTA INVESTMENTS LIMITED | 00213177 | 31/12/1994 | 29/11/2010 | Strike Off |
| AMES CROSTA LIMITED | 02218148 | 31/12/1994 | 29/11/2010 | Strike Off |
| BIWATER ADVISORY SERVICES LIMITED | 00960480 | 31/12/1994 | 29/11/2010 | Dissolved |
| BIWATER HOLDINGS LIMITED | 00929686 | 01/02/1997 | 14/12/2010 | Three Red Flags (Highest) |
| BIWATER INTERNATIONAL LIMITED | 00976157 | 10/06/2005 | 21/03/2007 | Three Red Flags (Highest) |
| BIWATER INVESTMENTS LIMITED | 06429017 | 06/10/2009 | 29/11/2010 | Not Trading |
| BIWATER OVERSEAS LIMITED | 02617474 | 08/03/2004 | 29/11/2010 | Amber |
| BIWATER PROCESS PLANT LIMITED | 00760074 | 01/03/1994 | 29/11/2010 | Strike Off |
| BRITISH WATER | 03953229 | 11/05/2006 | 23/11/2012 | Gold |
| BYPRODUCT RECOVERY LIMITED | 06257744 | 24/05/2007 | 23/12/2010 | Silver |
| MWH FARRER LIMITED | 05728436 | 02/03/2006 | 23/12/2010 | Amber |
| MWH TREATMENT LIMITED | 01535477 | 18/08/1991 | 23/12/2010 | Silver |
| STANTEC TREATMENT HOLDING LIMITED | 05728439 | 02/03/2006 | 23/12/2010 | Dissolved |
| UNITED FILTERS & ASSOCIATES LIMITED | 00887789 | 31/12/1994 | 29/11/2010 | Dissolved |
| UNITED FILTERS AND ENGINEERING LIMITED | 00209020 | 31/12/1994 | 29/11/2010 | Strike Off |