No person, firm or corporation shall deposit in, allow to escape into, or cause or permit to escape into, the sanitary sewer system of the city any material or substance that would in any manner, damage or injuriously affect the operation of the system. The above includes, but is not limited to, petroleum products, grease, chemicals, refuse, or any other substance that will affect, injure, or retard the biological, basement drains, wash racks drains, or any drain conveying surface or storm water shall be connected directly or indirectly with any sanitary sewerage system. (Prior code § 4-1-43)