45 ILCS 145/4

Whenever any three of the States of Indiana, Michigan, Minnesota, New York, Ohio, Pennsylvania and Wisconsin shall have ratified said compact and The Congress shall have given its consent, the Governor of the State of Illinois shall appoint 5 commissioners as representatives of the State of Illinois on The Great Lakes Commission, whose duties and authority on behalf of the State of Illinois shall be as provided in said compact. Of these 5 commissioners, not more than 2 shall be residents of the City of Chicago and not more than one shall be a resident of Cook County outside the city limits of Chicago.