| Case Number | Case Title | Open Date | Closed Date |
| 07-0292-WS-ORD | IN THE MATTER OF THE COMMISSIONS REVIEW OF CHAPTER 4901:1-15 OHIO ADMINISTRATIVE CODE STANDARDS FOR WATERWORKS COMPANIES AND SEWAGE DISPOSAL SYSTEM | 03/28/2007 | 08/18/2009 |
| 13-0234-WS-ORD | AMENDMENT OF RULE 4901:1-15-35 OHIO ADMINISTRATIVE CODE TO IMPLEMENT REVISIONS TO SECTION 4909.172 REVISED CODE | 01/16/2013 | 01/31/2014 |
| 16-1568-WS-ORD | IN THE MATTER OF THE REVIEW OF THE STANDARDS FOR WATERWORKS COMPANIES AND SEWAGE DISPOSAL SYSTEMS COMPANIES IN OHIO ADM.CODE CHAPTER 4901:1-15 | 07/13/2016 | 02/13/2018 |
| 22-0771-WS-ORD | IN THE MATTER OF THE REVIEW OF THE STANDARDS FOR WATERWORKS COMPANIES AND SEWAGE DISPOSAL SYSTEM COMPANIES IN OHIO ADM.CODE CHAPTER 4901:1-15. | 08/08/2022 | 10/03/2023 |