Ind. Code § 13-18-26-1
(a) A permit for the operation of a water treatment plant or a wastewater treatment plant that is:
(2) amended for the purposes of:
(B) the expansion of an existing plant;
under this article after June 30, 2018, is subject to the requirements set forth in sections 2 through 6 of this chapter.
As added by P.L.126-2018, SEC.6.