Indiana Code Title 13. Environment § 13-21-5-9

Sec. 9. (a) If the commissioner disapproves a district plan submitted by a board, the commissioner shall promptly:

(b) The district shall do the following:

(c) Before adoption of the revised district plan, the board shall hold a public hearing using the procedures in section 3 of this chapter.

(d) The commissioner shall approve or disapprove a revised district plan within one hundred twenty (120) days after the revised plan is submitted to the commissioner.  If the commissioner fails to act within one hundred twenty (120) days after a revised plan is submitted, the revised plan is considered approved.