The effective date for the operation of the latest edition of the Uniform Plumbing Code within the city shall be six months following its adoption by the California Building Standards Commission, unless by ordinance enacted within said period the city council provides otherwise. (Ord. 96-25 § 1(35), 1996; Ord. 86-15 § 1, 1986; Ord. 81-2 § 2(n), 1981)