Indiana Code Title 8. Utilities and Transportation § 8-1.5-5-24

Sec. 24. (a) Whenever work on a storm water system (that is combined with a sanitary sewer system) necessitates the repair or replacement of all or part of a sanitary sewer system, the entity that owns or maintains the sanitary sewer system shall assume a proportionate share of the cost of repairing or replacing the sanitary sewer system.

(b) The board and the entity that owns or manages the sanitary sewer system shall negotiate the division of the costs described in subsection (a).

(c) If the parties cannot agree to a division of the costs, they shall petition the circuit court, superior court, or probate court of the county where the majority of the systems are located to divide the costs.  The circuit court, superior court, or probate court shall hold a hearing on the division of costs within sixty (60) days after receiving the petition.  The court shall publish notice of the hearing in accordance with IC 5-3-1.  The decision of the court is binding on both parties.