Ill. Admin. Code tit. 35, § 395.202
b) The Agency shall issue a separate notice in the absence of an agreement to issue notice jointly, or when the Agency determines that the joint notice will not sufficiently apprise interested persons of the application for certification. In determining the form of this notice, the Agency will consider the nature and extent of the discharge and the interests of those who may be affected. Such notice shall include at least the following information: