Indiana Code Title 13. Environment § 13-26-2-2

Sec. 2.  (a) The petition may be filed by any representative of one (1) or more eligible entities involved after being authorized by the fiscal body of the petitioning eligible entity or entities included in the plan of the proposed district.

(b) If the proposed district includes:

the petition may be joined or filed by any representative of that department after having been authorized by the natural resources commission, with the approval of the executive of the county containing the territory of the district.