Every year, a financial audit of MSD is conducted for the State of Ohio. This audit is conducted by a third-party firm or the State Auditor's office.
The audits are available below for download:

The State of Ohio initiated a special audit of MSD led by the Auditor's Office.
The State of Ohio initiated a performance audit of MSD led by the Auditor's Office.
The City of Cincinnati initiated an independent audit of MSD led by Bill Moeller and Jim Goetz.