225 ILCS 37/22

(a) Any person who meets the educational qualifications specified in Section 20, but does not meet the experience requirement specified in that Section, may make application to the Department on a form prescribed by the Department for licensure as an environmental health practitioner in training. The Department shall license that person as an environmental health practitioner in training upon payment of the fee required by this Act. (b) An environmental health practitioner in training shall apply for licensure as an environmental health practitioner within 3 years of his or her licensure as an environmental health practitioner in training. The license may be renewed or extended as defined by rule of the Department. The Board may extend the licensure of any environmental health practitioner in training who furnishes, in writing, sufficient cause for not applying for examination as an environmental health practitioner within the 3-year period. (c) An environmental health practitioner in training may engage in the practice of environmental health for a period not to exceed 6 years provided that he or she is supervised by a licensed professional engineer or a licensed environmental health practitioner as prescribed in this Act.