Ill. Admin. Code tit. 77, § 797.1500
c) If the Department suspects that a communicable disease is or may be transmitted by an operator/apprentice, by use of unapproved or malfunctioning equipment, or by unsanitary or unsafe conditions and practices or other imminent health hazard that may adversely affect the health of the public, upon written notice to the owner or operator, the Department shall do any or all of the following: