(A) No person shall discharge or cause to be discharged any of the following described waters or wastes to any public sewer:
(1) Any gasoline, benzene, naphtha, fuel oil or other flammable or explosive liquid, solid or gas;
(2) Any waters or wastes containing toxic or poisonous solids, liquids or gases in sufficient quantity, either singly or by interaction with other wastes, to injure or interfere with any sewage treatment process, constitute a hazard to humans or animals, create a public nuisance or create any hazard in the receiving waters of the wastewater treatment plant;
(3) Any waters or wastes having a pH lower than 5.5, or having any other corrosive property capable of causing damage or hazard to structures, equipment and personnel of the wastewater works; and
(4) Solid or viscous substances in quantities or of such size capable of causing obstruction to the flow in sewers, other interference with the proper operation of the sewage works such as, but not limited to, ashes, cinders, sand, mud, straw, shavings, metal, glass, rags, feathers, tar, plastics, wood, unground garbage, whole blood, paunch manure, hair and fleshings, entrails, offal, paper dishes, cups, milk containers and the like either whole or ground by garbage grinders.
(B) The following described substances, materials, waters or wastes shall be limited in discharges to municipal systems to concentrations or quantities which will not harm either the sewers, wastewater treatment process or equipment, will not have an adverse effect on the receiving stream or will not otherwise endanger lives, limb, public property or constitute a nuisance. The Engineer may set limitations lower than the limitations established in the regulations below if in his or her opinion more severe limitations are necessary to meet the above objectives. In forming his or her opinion as to the acceptability, the Engineer will give consideration to the factors as the quantity of subject waste in relation to flows and velocities in the sewers, materials of construction of the sewers, the wastewater treatment process employed, capacity of the wastewater treatment plant, degree of treatability of the waste in the wastewater treatment plant and other pertinent factors. The limitations or restrictions on materials or characteristics of waste or wastewaters discharged to the sanitary sewer which shall not be violated without approval of the Engineer are as follows:
(1) Wastewater having a temperature higher than 150°F (65°C);
(2) Wastewater containing more than 25 milligrams per liter of petroleum oil, nonbiodegradable cutting oils or product of mineral oil origin;
(3) Wastewater from industrial plants containing floatable oils, fat or grease;
(4) Any garbage that has not been properly shredded. Garbage grinders may be connected to sanitary sewers from homes, hotels, institutions, restaurants, hospitals, catering establishments or similar places where garbage originates from the preparation of food in kitchens for the purpose of consumption on the premises or when served by caterers;
(5) Any waters or wastes containing iron, chromium, copper, zinc and similar objectionable or toxic substances to such degree that any material received in the composite wastewater at the wastewater treatment works exceeds the limits established by the Engineer for the materials;
(6) Any waters or wastes containing odor-producing substances exceeding limits which may be established by the Engineer;
(7) Any radioactive wastes or isotopes of the half-life or concentration as may exceed limits established by the Engineer in compliance with applicable state or federal regulations;
(8) Quantities of flow, concentrations or both which constitute a “slug” as defined in § 50.01 of this code;
(9) Waters or wastes containing substances which are not amenable to treatment or reduction by the wastewater treatment processes, or are amenable to treatment only to such degree that the wastewater treatment plant effluent cannot meet requirements of other agencies having jurisdiction over discharge to the receiving waters; and
(10) Any waters or wastes which, by interaction with other waters or wastes in the public sewer system, release obnoxious gases, form suspended solids which interfere with the collection system or create a condition deleterious to structures and treatment processes.
(Prior Code, § 50.21) Penalty, see § 51.99