Ill. Admin. Code tit. 23, § 3030.200
a) Libraries may apply for full membership in a library system at any time. The library system may not charge an application fee to the applying library or an annual membership fee. As part of the application process, a site visit by a system staff member to the applicant library is required. Membership criteria specified in this Section must be met by applicants.
1) Upon recommendation of the library system board of directors, the State Librarian shall review the recommendation of the library system board in approving an application of a library for full membership in a library system when the library is located within the geographic boundaries of the library system and meets the following criteria for membership:
2) Once membership status is approved, the following requirements apply to all full members except when otherwise specific in this subsection (a):
b) Phasing Out of Developmental Library Membership Status