| Case Number | Case Title | Open Date | Closed Date |
| 89-0648-WS-AIS | OHIO SUBURBAN WATER COMPANY | 04/26/1989 | 05/09/1989 |
| 89-1133-WS-UNC | ATHENS ENVIRONMENT SERVICE COMPANY | 07/25/1989 | 08/01/1989 |
| 89-7016-WS-TRF | CORDELL REGIONAL UTILITIES, INC | 09/08/1989 | 03/10/2014 |
| 89-7026-WS-TRF | OHIO SUBURBAN WATER COMPANY | 07/10/1989 | 08/25/1995 |
| 89-7027-WS-TRF | CITIZENS UTILITY COMPANY | 09/13/1989 | 05/30/2000 |
| 89-7045-WS-TRF | WATER AND SEWER, LLC | 12/01/1989 | 10/03/2023 |