70 ILCS 3705/23
Rules and regulations governing the maintenance and operation of the waterworks properties, and sewerage properties of the district shall be established from time to time by ordinance, and rates and charges for use and service for all purposes, except for charges or rates established by contract for a wholesale supply of water as herein authorized shall be established, revised, maintained, be due and payable, and be in force as the board of trustees may determine by ordinance, and rates or charges established by the board of trustees shall not be subject to any statutory regulations covering rates and charges or similar service by privately owned waterworks. The board of trustees of the water district may establish a rate classification schedule for the use and service of the waterworks properties and sewerage properties which differentiates in rates and charges between users currently served by the district after its creation and new users who are served after the effective date of this amendatory Act of 1982 by the acquisition, improvement, construction, or extension of waterworks properties and sewerage properties under Sections 12, 23a or 23e of this Act. Such rate differentiation shall be made only (1) if the cost for servicing the new users is greater than the cost for servicing the current users or (2) if necessary to defray a proportionate share of the payment of the principal of and interest on any revenue bonds issued under Sections 16, 23b or 23e of this Act. Such rates shall be in proportion to the cost of providing service and shall be imposed fairly on all new users.
Any ordinance establishing rules and regulations or rates or charges for the use and service shall be published within 30 days after its adoption in a newspaper published in the district, and if there is no such newspaper, in a newspaper published in the county and having general circulation in the district, and shall become effective 10 days after such publication.
70 ILCS 3705/23