44 Ill. Adm. Code 4.7000
Severability
Section 526
Section 4.7000 Severability
If any provision of the Part or
any application of it to any person or circumstance is held invalid, that
invalidity shall not affect other provisions or applications of this Part that
can be given effect without the invalid provision or application and, to this
end, the provisions of this Part are declared to be severable.