No person shall discharge or cause to be discharged into a stormwater system any waste materials, liquids, vapor, fat, gasoline, benzene, naphtha, oil or petroleum product, mud, straw, lawn clippings, tree limbs or branches, metal or plastic objects, rags, garbage or any other substance which is capable of causing an obstruction to the flow of the storm system or interfere with the proper operation of the system or which will pollute the natural creeks or waterways.