35 Ill. Adm. Code 203.1820
Compliance by Existing Sources
Section 203.1820Â Compliance
by Existing Sources
The owner or operator shall demonstrate that all major
stationary sources which he or she owns or operates (or which are owned or
operated by any entity controlling or controlled by, or under common control,
with the owner or operator) in Illinois are in compliance, or on a schedule for
compliance, with all applicable state and federal air pollution control
requirements. For purposes of this Section, a schedule for compliance shall be
federally enforceable or contained in an order of the Board or a court decree.