Effective Mar 23, 202347 Ill. Reg. 4437AUTHORITY: Implementing Section 13 and authorized by Sections 11(b) and 27 of the Environmental Protection Act [415 ILCS 5/13, 11(b), and 27].POLLUTION CONTROL BOARD
pH must be within the range of 6.5 to 9.0 except due to natural causes.
(Source: Amended at 47 Ill. Reg. 4437, effective March 23, 2023)