During the month of June of each calendar year, municipalities must investigate and ascertain the prevailing rate of wages to be paid for work on public works and post or keep available its determination of such prevailing wages as well as ﬁle a certiﬁed copy thereof in the office of the Illinois Department of Labor no later than July 15. (820 ILCS 130/9.) A municipality may request the Department of Labor to ascertain the prevailing rate of wages. (820 ILCS 130/4, and 820 ILCS 130/9.)
The public body except for the Department of Transportation with respect to highway contracts shall within 30 days after filing with the Department of Labor, or the Department of Labor shall within 30 days after filing with such public body, publish in a newspaper of general circulation within the area that the determination is effective, a notice of its determination and shall promptly mail a copy of its determination to any employer, and to any association of employers and to any person or association of employees who have filed their names and addresses, requesting copies of any determination stating the particular rates and the particular class of workers whose wages will be affected by such rates. If the Department of Labor ascertains the prevailing rate of wages for a public body, the public body may satisfy the newspaper publication requirement in this paragraph by posting on the public body's website a notice of its determination with a hyperlink to the prevailing wage schedule for that locality that is published on the official website of the Department of Labor.