55 ILCS 5/5-25008: Jurisdiction of department.

Each county and multiple-county health department has jurisdiction for the purposes of this Division throughout the entire county or multiple counties, except within:

1. Any public health district organized under "An Act to authorize the organization of public health districts and for the establishment and maintenance of a health department for the same," filed June 26, 1917, as amended;

2. Any city, village or incorporated town or combination thereof of less than 500,000 inhabitants which city, village, incorporated town or combination thereof or public health district maintains a local health department and employs a full-time health officer and other professional personnel possessing such qualifications as may be prescribed by the State Department of Public Health;

3. Any city, village or incorporated town of 500,000 or more inhabitants.