The Chicago False Claims Act Ordinance allows whistleblowers who know of violations of the law to bring a civil action in the name of the city.
A successful whistleblower will receive between 15 and 25 percent of the recovery where the city pursues the action; if the city does not intervene a successful whistleblower will receive between 25 and 30 percent of the proceeds. The share may be reduced if the whistleblower planned, initiated or participated in the violation. A person convicted of criminal conduct related to the violation will not receive an award.
Read the full text of the law here.