| Case Number | Case Title | Open Date | Closed Date |
| 77-0083-WW-AAC | ARROWHEAD HILLS UTILS CORPORATION | 01/14/1977 | 10/03/2023 |
| 77-0123-WW-ACE | APPLEGROVE WATER COMPANY | 01/18/1977 | 12/07/1977 |
| 77-0133-WW-AIR | OHIO WATER SERVICE COMPANY | 01/20/1977 | 10/12/1977 |
| 77-0160-WW-CSS | RYLES/OHIO SUBURBAN WATER COMPANY | 01/21/1977 | 06/01/1977 |
| 77-0194-WW-AIR | MASURY WATER COMPANY | 01/26/1977 | 06/07/1978 |
| 77-0199-WW-AIS | VALLEY WATER WORKS INCORPORATED | 01/26/1977 | 04/05/1977 |
| 77-0521-WW-AAC | CAMPLANDS WATER COMPANY | 03/22/1977 | 10/03/2023 |
| 77-0559-WW-ARJ | MONTROSE WATERWORKS INCORPORATED | 04/04/1977 | 08/24/1977 |
| 77-0640-WW-ATA | OHIO SUBURBAN WATER COMPANY | 04/22/1977 | 05/25/1977 |
| 77-0686-WW-AIR | OHIO WATER SERVICE COMPANY | 05/03/1977 | 03/28/1979 |
| 77-0752-WW-UNC | ASHTABULA WATER WORKS COMPANY | 05/19/1977 | 08/17/1977 |
| 77-0789-WW-ATA | OHIO CITIES WATER COMPANY | 05/26/1977 | 07/06/1977 |
| 77-0790-WW-ATA | MARION WATER COMPANY | 05/26/1977 | 07/06/1977 |
| 77-0791-WW-ATA | LAWRENCE COUNTY WATER COMPANY | 05/26/1977 | 07/06/1977 |
| 77-0792-WW-ATA | ASHTABULA WATER WORKS COMPANY | 05/26/1977 | 07/06/1977 |
| 77-0815-WW-CMR | OHIO WATER SERVICE /MENTOR | 06/01/1977 | 08/16/1978 |
| 77-0816-WW-ATA | MIDLAND CITY-WESTBORO WATER COMPANY | 06/01/1977 | 08/24/1977 |
| 77-0860-WW-ATA | SENECA UTILITIES INCORPORATED | 06/16/1977 | 10/25/1978 |
| 77-0994-WW-CSS | CONRAD/LAKE WHITE WATER TRUST | 07/18/1977 | 06/29/1978 |
| 77-1012-WW-ABN | BURR OAK SERVICE COMPANY | 07/26/1977 | 02/08/1978 |
| 77-1055-WW-AIS | OHIO WATER SERVICE COMPANY | 08/08/1977 | 09/14/1977 |
| 77-1068-WW-AIR | WALNUT CREEK WATER COMPANY | 08/15/1977 | 01/30/1979 |
| 77-1157-WW-ATA | TOMAHAWK UTILITIES INCORPORATED | 09/12/1977 | 03/15/1978 |
| 77-1158-WW-ATA | SENECA UTILITIES INCORPORATED | 09/12/1977 | 03/15/1978 |
| 77-1160-WW-ATA | BRIMFIELD WATER COMPANY | 09/12/1977 | 02/15/1978 |
| 77-1161-WW-ATA | VALLEY UTILITY COMPANY | 09/12/1977 | 02/15/1978 |
| 77-1162-WW-ATA | OHIO WATER SERVICE COMPANY | 09/12/1977 | 06/14/1978 |
| 77-1163-WW-ATA | OHIO SUBURBAN WATER COMPANY | 09/12/1977 | 09/29/1977 |
| 77-1164-WW-ATA | ARROWHEAD HILLS UTILS CORPORATION | 09/12/1977 | 10/03/2023 |
| 77-1233-WW-ACE | IMPERIAL WATER COMPANY INCORPORATED | 09/27/1977 | 02/07/1979 |
| 77-1263-WW-ABN | LAKE WAYNOKA UTILITIES INCORPORATED | 10/04/1977 | 11/22/1977 |
| 77-1329-WW-AIS | OHIO AMERICAN WATER COMPANY | 10/25/1977 | 11/22/1977 |
| 77-1470-WW-AIS | OHIO WATER SERVICE COMPANY | 12/12/1977 | 12/29/1977 |
| 77-1523-WW-AIR | LAKE WHITE WATER WORKS | 12/29/1977 | 08/08/1979 |
| 78-0005-WW-ABN | LAND OHIO TRUST | 12/27/1977 | 09/13/1978 |