65 ILCS 5/11-123-11

Every city or village may levy and collect in each of 4 consecutive years a tax of .0125% of the value, as equalized or assessed by the Department of Revenue, of all taxable property therein, for the current year. This tax shall be in addition to all taxes authorized by law to be levied and collected in that municipality. The proceeds of this additional tax shall be used for harbor construction purposes only and shall be credited to the harbor fund for that particular harbor development.

The foregoing limitation upon tax rate in cities and villages of less than 1,000,000 population may be increased or decreased according to the referendum provisions of the General Revenue Law of Illinois.