70 ILCS 2905/3-1
The district shall be governed by a Board of Commissioners, consisting of 5 commissioners . Two of the commissioners shall be residents of that portion of the district in the county having the greater equalized assessed valuation of the district, and 2 shall be residents of that portion of the district in the other county. The appointment of commissioners from each county shall be made by the chairman of the county board of that county with the advice and consent of the county board, except that in the case of a home rule county as defined by Article VII, Section 6, of the Constitution of 1970 the appointment shall be made by the chief executive officer of the county with the advice and consent of the county board. Beginning on the effective date of this amendatory Act of the 101st General Assembly, the mayor, or his or her designee, of the largest municipality in the county having the greater equalized assessed valuation of the district shall be an ex officio commissioner with a right to vote. If there is not a vacant commissioner position from the county having the greater equalized assessed valuation on the effective date of this amendatory Act of the 101st General Assembly, then the term of the last appointed commissioner from that county is terminated on the effective date of this amendatory Act of the 101st General Assembly.
The appointed commissioners from each county may not be from the same political party.
The County Board Chairman of either county may remove any of the appointed commissioners from his or her county with the advice and consent of the county board.
In the first appointments to the Board of Commissioners, the appointing authority appointing 3 directors shall designate one appointee to serve for a term of one year, one for a term of 3 years and one for a term of 5 years, and the appointing authority appointing 2 directors shall designate one to serve for a term of 2 years and one for a term of 4 years. Thereafter one commissioner shall be appointed by the appropriate appointing authority each year for a term of 5 years to succeed the director whose term expires in that year. Any vacancy on the Board of Commissioners shall be filled by appointment by the appropriate appointing authority for the remainder of the unexpired term.
For the purpose of determining the ex officio commissioner, the county having the greater equalized assessed valuation of the district shall be established on January 1 of each year, and the ex officio commissioner shall serve until January 1 of the following year.
70 ILCS 2905/3-1