70 ILCS 3020/15
(b) The initial trustees shall be selected by the members of the General Assembly whose legislative districts encompass any portion of the district. Each of the trustees shall live within the sanitary district. The terms of the initial trustees shall expire on the first Monday in May, 1995.
Within 60 days after appointment, the initial trustees shall divide the sanitary district into 3 wards that are compact, contiguous, and substantially equal in population for the purpose of electing trustees from those wards.
(d) The initial board of trustees elected at the first election of trustees shall determine by lot at their first meeting the lengths of their terms. One trustee and his or her successors shall serve terms of 2 years, 4 years, and 2 years. The other 2 trustees and their successors shall each serve 4-year terms.
The first board of trustees elected after each decennial federal census shall also determine by lot at their first meeting the lengths of their terms. One trustee and his or her successors shall serve terms of 4 years, 4 years, and 2 years; the second trustee and his or her successors shall serve terms of 4 years, 2 years, and 4 years; the third trustee and his or her successors shall serve terms of 2 years, 4 years, and 4 years.
(Source: P.A. 88-390.)