No person shall discharge, directly or indirectly, into the municipal
sewer system, abnormal sewage or industrial wastewater containing
any of the following substances: antimony, arsenic, barium, beryllium,
bromine, cadmium, chlorides, chromium (hexavalent), chromium (total),
cobalt, copper, cyanide (complex), cyanide (free), fluorides, gold,
iodine, iron, lead, manganese, mercury, molybdenum, nickel, phenols,
total selenium, silver, sulfates, sulfides, tin, titanium, vanadium,
or zinc.