35 Ill. Adm. Code 105.202
Parties
Section 105
Section 105.202 Parties
a) Petitioner. The person who files a petition for review of
the Agency's final decision must be named the petitioner.
b) Respondent. The Agency must be named the respondent. If a
petition is filed under Section 105.204(b), (c), or (d) by a person other than
the permit applicant, the permit applicant must be named as a respondent in
addition to the Agency.