70 ILCS 3105/12
Actions of the board of a legislative character shall be in the form of ordinances. All ordinances imposing any penalty or making any appropriations shall be published at least once a week for 2 weeks in at least one newspaper published in the district, or if no newspaper of general circulation is published therein, by posting copies of the same in at least 15 conspicuous public places in the district. No such ordinance shall take effect until 10 days after it is so published or posted. All other ordinances and resolutions shall take effect from and after their passage unless otherwise provided therein.
All ordinances, orders and resolutions and the date of publication thereof may be proven by the certificate of the secretary under the seal of the district and when printed in book or pamphlet form and purporting to be published by the district, such book or pamphlet shall be received as evidence of the passage and legal publication of such ordinances, orders and resolutions as of the dates mentioned in such books or pamphlet, in all courts without further proof.
70 ILCS 3105/12