AUTHORITY: Implementing and authorized by Sections 5, 14.4, 21, 22, and 27 of the Environmental Protection Act [415 ILCS 5/5, 14.4, 21, 22, and 27].
SOURCE: Adopted in R89-5 at 16 Ill. Reg. 1538, effective January 10, 1992; amended in R92-20 at 17 Ill. Reg. 1871, effective January 28, 1993; amended in R96-18 at 21 Ill. Reg. 6503, effective May 8, 1997; amended in R18-26 at 47 Ill. Reg. 7581, effective May 16, 2023.