70 ILCS 2305/7.4

The board of trustees of any sanitary district organized under this Act may require that before any person or municipal corporation connects to the sewage system of the district the district be permitted to inspect the drainage lines of a person or municipal corporation to determine whether they are adequate and suitable for connection to its sewage system. In addition to the other charges provided for in this Act, the sanitary district may collect a reasonable charge for this inspection service. Funds collected as inspection charges shall be used by the sanitary district for its general corporate purposes after payment of the costs of making the inspection.