SECTION 8.15  TAXES DUE NOTIFICATION THEREOF.
   City taxes shall be due on July 1st of each year. The treasurer shall not be required to call upon persons named in the city tax roll nor make personal demand for payment of taxes, but shall:
   (1)   Publish between June 15th and July 1st notice of the time when said taxes will be due for collection and of the penalties and fees for the late payment thereof; and
   (2)   Mail a tax bill to each person named in said roll.  In cases of multiple ownership of property only one bill need be mailed.  Failure on the part of the treasurer to publish said notice or mail such bills shall not invalidate such taxes on said tax roll nor release the person or property assessed from the penalties and fees provided in this chapter in case of late or nonpayment of same.