All bills for water services not paid within 15 days from the due date thereof, as stated in such bills, shall be subject to the collection or deferred payment charge of 10% on the first $3 and 3% on the excess over $3.
(`94 Code, § 54.07) (Ord. 2-1969, passed 9-8-69; Am. Ord. 2-1980, passed 3-17-80; Am. Ord. 7-1980, passed 6-16-80)