Ill. Admin. Code tit. 83, § 462.40
f) An applicant shall have in force, and provide proof that it has in force, general liability insurance that shall remain in effect for a period of not less than one year.
3) The commercial general liability insurance must be maintained with an insurance company whose Best's rating is A- or better and whose Best's financial size category is VII or larger:
Applications for certification under this Part shall contain the following information: