Ill. Admin. Code tit. 35, § 380.810
An applicant for reciprocity whose accrued experience entitles admission to a higher level of Illinois certification, but whose previous classification and examination entitles the applicant to a lower level of reciprocal certification, will receive reciprocal certification at the lower level unless the applicant passes the Illinois wastewater operator examination for the higher classification.
(Source: Amended at 43 Ill. Reg. 5203, effective July 1, 2019)