70 ILCS 2605/4.7
All applicants for offices or places in said classified civil service, except for the positions of deputy director of engineering, deputy director of monitoring and research, deputy director of maintenance and operations, assistant director of engineering, assistant director of maintenance and operations, deputy general counsel, head assistant attorneys, assistant director of monitoring and research, assistant director of information technology, assistant director of human resources, comptroller, assistant treasurer, assistant director of procurement and materials management, and laborers, shall be subjected to examination, which shall be public and competitive with limitations specified in the rules of the Director as to residence, age, sex, health, habits, moral character and qualifications to perform the duties of the office or place to be filled, which qualifications shall be prescribed in advance of such examination. Such examinations shall be practical in their character, and shall relate to those matters which will fairly test the relative capacity of the persons examined to discharge the duties of the position to which they seek to be appointed, and may include tests of physical qualifications and health and when appropriate, of manual skill. No question in any examination shall relate to political or religious opinions or affiliations. The Director shall control all examinations, and may, whenever an examination is to take place, designate a suitable number of persons to be special examiners and it shall be the duty of such special examiners to conduct such examinations as the Director may direct, and to make return and report thereof to him; and he may at any time substitute any other person in the place of any one so selected; and he may himself, at any time, act as such special examiner, and without appointing other special examiners. The Director shall, by rule, provide for and shall hold sufficient number of examinations to provide a sufficient number of eligibles on the register for each grade of position in the classified civil service, and if any place in the classified civil service shall become vacant, to which there is no person eligible for appointment, he shall hold an examination for such position and repeat the same, if necessary, until a vacancy is filled in accordance with the provisions of this Act.
Eligible registers shall remain in force for 3 years, except the eligible register for laborers which shall remain in force for 4 years and except the eligible registers for student programs and entry level engineering positions which, in the Director's discretion, may remain in force for one year.
Examinations for an eligible list for each position in the classified service above mentioned shall be held at least once in 3 years and at least annually for student programs and entry level engineering positions if the Director has limited the duration of the registers for those positions to one year, unless the Director determines that such examinations are not necessary because no vacancy exists.
To help defray expenses of examinations, the sanitary district may, but need not, charge a fee to each applicant who desires to take a civil service examination provided for by this Act. The amount of such fees shall be set by the corporate authority of the sanitary district. Such fees shall be deposited in the corporate fund of the district.
70 ILCS 2605/4.7