Ill. Admin. Code tit. 35, § 690.203
a) Except as provided otherwise in subsection (b), payment of the fee must be by check or money order payable to "Treasurer, State of Illinois" and shall be submitted along with the permit application or as-built plans to:
Illinois Environmental Protection Agency
Division of Public Water Supplies
2520 W. Iles Ave.
P.O. Box 19276
Springfield, Illinois 62794-9276
(Source: Amended at 49 Ill. Reg. 16224, effective December 4, 2025)