There shall be no discharge of any toxic substance,
gasoline, benzene, naphtha, fuel, oil, or other flammable or explosive
liquid, solid or gas, any liquid having a temperature higher than
150° F. or any matter containing any ashes, cinders, sand, mud,
straw shavings, metal, glass, rags, feathers, tar, plastics, wood,
paunch manure, or any solid or viscous substance capable of causing
obstructions or other interference with the proper operation of a
sewage treatment plant, or any liquid having a pH power lower than
5.0 or higher than 9.0 or having any other corrosive property capable
of causing damage or hazard to structures, equipment or personnel,
or material which would be harmful to the treatment of sewage.