The word "Commission," used in this Part, shall be construed to mean the Illinois Commerce Commission.
The word "customer," used in this Part, shall be construed to mean any person, firm, or corporation, municipality or other political subdivision of the state taking water service from any such utility.
The word "utility," used in this Part, shall be construed to mean public utility.
Ill. Admin. Code tit. 83, § 600.50