5 ILCS 100/10-50: Decisions and orders.

(a) A final decision or order adverse to a party (other than the agency) in a contested case shall be in writing or stated in the record. A final decision shall include findings of fact and conclusions of law, separately stated. Findings of fact, if set forth in statutory language, shall be accompanied by a concise and explicit statement of the underlying facts supporting the findings. If, in accordance with agency rules, a party submitted proposed findings of fact, the decision shall include a ruling upon each proposed finding. Parties, their attorneys, or their other agents appointed to receive service of process as reflected in the administrative record shall be notified and provided a copy of the decision or order either personally, by registered or certified mail, by email as provided by Section 10-75, or as otherwise provided by law. In addition, a copy of the decision or order shall be mailed by first-class regular United States mail forthwith to each party and to the party's attorney of record. This mailing requirement does not apply to a party's attorney or a party's other agent, or a self-represented litigant who has elected to use an agency's electronic filing system or has accepted service by email, when the decision or order is made available for electronic retrieval through an electronic filing system or has been served by email as otherwise provided by law.

(b) All agency orders shall specify whether they are final and subject to the Administrative Review Law. Every final order shall contain a list of all parties of record to the case including the name and address of the agency or officer entering the order and the addresses of each party as known to the agency where the parties may be served with pleadings, notices, or service of process for any review or further proceedings. Every final order shall also state whether the rules of the agency require any motion or request for reconsideration and cite the rule for the requirement. The changes made by this amendatory Act of the 100th General Assembly apply to all actions filed under the Administrative Review Law on or after the effective date of this amendatory Act of the 100th General Assembly.

(c) A decision by any agency in a contested case under this Act shall be void unless the proceedings are conducted in compliance with the provisions of this Act relating to contested cases, except to the extent those provisions are waived under Section 10-70 and except to the extent the agency has adopted its own rules for contested cases as authorized in Section 1-5.