The taxes thus levied on July 1 or, if later, as soon as they are levied, shall become an obligation to the City from the persons against whom they are levied. The amounts levied, together with all legal charges, shall be a lien upon the property taxed until they are paid. The Clerk-Treasurer shall have the authority and duty to collect the City taxes as required by State law and granted to township treasurers in collecting state, school, and county taxes.