35 Ill. Adm. Code 404.102
Exemption from State Permit: NPDES Holder
Section 404
Section 404.102 Exemption
from State Permit: NPDES Holder
a) A permittee who holds an NPDES permit for a facility need not
have a State permit for that facility.
b) This exemption is inapplicable if the Agency ceases to
administer the NPDES permit program. If this occurs, the Agency must notify
permittees that State permits are required and must determine deadlines, of at
least 45 days after notification, by which the Agency must receive State permit
applications.