| Case Number | Case Title | Open Date | Closed Date |
| 80-0018-WW-AAM | OHIO AMERICAN WATER COMPANY | 01/07/1980 | 01/30/1980 |
| 80-0033-WW-AIR | LAKE WHITE WATER WORKS | 01/10/1980 | 06/24/1980 |
| 80-0065-WW-ARJ | PENINSULA WATER WORKS INCORPORATED | 01/18/1980 | 02/13/1980 |
| 80-0142-WW-CSS | SPARKS/CHOCTAW UTILS INCORPORATED | 02/07/1980 | 12/17/1980 |
| 80-0176-WW-AIR | COPLEY SQUARE WATER COMPANY | 02/14/1980 | 09/16/1981 |
| 80-0229-WW-CSS | ECK/LAKENGREN UTILS INCORPORATED | 02/22/1980 | 09/24/1980 |
| 80-0258-WW-AEC | OHIO SUBURBAN WATER COMPANY | 02/28/1980 | 04/02/1980 |
| 80-0342-WW-AIR | IMPERIAL WATER COMPANY INCORPORATED | 03/27/1980 | 05/27/1981 |
| 80-0407-WW-AIR | OHIO WATER SERVICE COMPANY | 04/14/1980 | 03/25/1981 |
| 80-0531-WW-AEM | OHIO WATER SERVICE COMPANY | 05/16/1980 | 07/16/1980 |
| 80-0610-WW-COI | INDIANBROOK WATER COMPANY | 06/11/1980 | 05/25/1983 |
| 80-0673-WW-AIR | OHIO WATER SERVICE COMPANY | 06/30/1980 | 06/24/1981 |
| 80-0708-WW-AAM | SUBURBAN WATER COMPANY | 07/09/1980 | 09/03/1980 |
| 80-0721-WW-COI | MRS GERALD C WEARSCH | 07/15/1980 | 04/01/1981 |
| 80-0743-WW-AEM | LAKE WHITE WATER WORKS | 07/23/1980 | 12/10/1980 |
| 80-0744-WW-AIR | LAKE WHITE WATER WORKS | 07/23/1980 | 11/12/1981 |
| 80-0910-WW-AIR | MASURY WATER COMPANY | 09/12/1980 | 05/13/1981 |
| 80-0999-WW-AIR | LAKE BUCKHORN UTILS INCORPORATED | 10/14/1980 | 01/05/1983 |
| 80-1000-WW-AIR | LORELEI UTILITIES INCORPORATED | 10/14/1980 | 01/05/1983 |
| 80-1001-WW-AIR | LAKENGREN UTILITIES INCORPORATED | 10/14/1980 | 01/05/1983 |
| 80-1002-WW-AIR | SHAWNEE HILLS UTILITY COMPANY | 10/14/1980 | 01/05/1983 |
| 80-1085-WW-AIR | OHIO WATER SERVICE COMPANY | 11/07/1980 | 01/20/1982 |
| 80-1140-WW-AIS | MADISON WATERWORKS INCORPORATED | 12/01/1980 | 12/17/1980 |
| 80-1176-WW-AIS | OHIO WATER SERVICE COMPANY | 12/08/1980 | 12/30/1980 |
| 80-1239-WW-AIR | MADISON WATERWORKS INCORPORATED | 12/29/1980 | 02/17/1982 |