Ind. Code § 8-1-2.2-25
The municipal utilities or joint agencies possessing ownership interests in a project shall, following the closing of each fiscal year, submit a consolidated or combined annual report of their activities (including the activities of any joint agency) with respect to such project for the preceding year to the respective governing bodies of such municipalities and to the commission. Each report shall set forth in a form prescribed by the commission a complete operating and financial statement covering the operations of the project during the year. The municipalities or joint agencies possessing ownership interests in a project shall cause an audit of the books of record and accounts relating to such project (including any joint agency) to be made at least once in each year by a certified public accountant or accountants and the cost of the audit may be treated as a cost of construction of the project, or otherwise as part of the expenses of the administration of the project covered by such audit.
IC 8-1-2.2-25