The discharge of non-acceptable industrial wastes, as herein defined, into the municipal system, whether directly or indirectly, is prohibited.  Where investigation reveals the presence in the municipal system of non-acceptable industrial wastes emanating from any lot, land, building, or premises, the occupant thereof shall be required to treat, neutralize, or in other ways prepare the noxious substance therein to the satisfaction of the City Manager, in order to convert the same into acceptable industrial wastes. 
(1974 Code, § 52.05)  (Ord. 23-73, passed 5-7-1973; Am. Ord. 25-87, passed 7-6-1987)