70 ILCS 2905/1-3

Appointments to the first board of commissioners of the new district shall be made in accordance with Section 3-1 of this Act at least 30 days before the first Monday in December of the year of the expiration of the terms of office of the incumbent trustees of the old district, and the commissioners so appointed shall take office on such first Monday in December. On that day, the old district is legally dissolved, and the new district under this Act shall succeed to all the property, functions, causes of action, rights and obligations of the former district.