35 Ill. Adm. Code 204.820
Source Obligation
Section 204.820 Source Obligation
Any owner or operator who constructs or operates a source or
modification not in accordance with the application submitted under this Part
or with the terms of any approval to construct, or any owner or operator of a
source or modification subject to this Part who begins actual construction
after September 4, 2020 without applying for and receiving approval under this
Part, shall be subject to appropriate enforcement action.