AUTHORITY: Implementing and authorized by Sections 9, 12, 13, 21, 22, and 27 of the Environmental Protection Act [415 ILCS 5/9, 12, 13, 21, 22, and 27].
SOURCE: Filed and effective January 1, 1978; amended at 2 Ill. Reg. 44, p. 137, effective October 30, 1978; codified at 7 Ill. Reg. 10592; amended in R90-7 at 15 Ill. Reg. 10075, effective July 1, 1991; amended in R12-23 at 38 Ill. Reg. 17661, effective August 11, 2014; amended in R18-25 at 48 Ill. Reg. 3170, effective February 15, 2024.