When a citizen of the city receives his monthly bill for city utilities, which includes water, sewer and garbage, and the same has not been paid by five o'clock (5:00) P.M. on the twentieth of the month or five o'clock (5:00) P.M. on the following working day if the twentieth falls on a Saturday, Sunday or holiday, the new bill will include a ten dollar ($10.00) late charge; provided, that the amount due exceeds ten dollars ($10.00). Once a late charge has been assessed, said late charge becomes part of the unpaid principal balance and is included in the bill for purposes of determining whether or not the unpaid balance exceeds ten dollars ($10.00) and is, therefore, subject to another late charge the following month. (Ord. 14.20, 11-19-2001; amd. 2006 Code)