(A) No person(s) shall discharge or cause to be discharged any of the following described waters or wastes to any public sewers or treatment works:
(1) Any gasoline, benzine, naptha, fuel oil, or other flammable or explosive liquid, solid, or gas; or
(2) Any waters or wastes having a pH lower than 6.0 or having any other corrosive property capable of or causing damage or hazard to structures, equipment, and personnel of the wastewater works.
(B) Solid or viscous substances in quantities or of a size capable of causing obstruction to the flow in sewers or other interferences with the proper operation of the wastewater facilities, such as but not limited to ashes, bones, cinders, sand, mud, straw, shavings, metal, glass, rags, feathers, tar, plastics, wood, unground garbage, whole blood, paunch manure, hair and fleshings, entrails and paper dishes, cups, milk containers, and the like, either whole or ground by garbage grinders.
(C) The following described substances, materials, waters, or waste 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 Superintendent may set limitations lower than the limitations established in the regulations below if in his or her opinion these more severe limitations are necessary to meet the above objectives. Deliberate dilution with unpolluted water to meet the concentrations established in the regulations below shall not be acceptable. In forming his or her opinion as to the acceptability, the Superintendent will give consideration to such facts as the quantity of subject waste in relation to flows and velocities in the sewers, materials of construction 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 wastewater discharged to the sanitary sewers which shall not be violated without approval of the Superintendent are as follows:
(1) Wastewater having a temperature higher than 150ºF;
(2) Wastewater containing more than 50 milligrams per liter of petroleum oil, nonbiodegradable cutting oils, product of mineral oil origin, or floatable oils, fat, wax, or grease;
(3) 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;
(4) Any waters or wastes containing solids, liquids, or gases in sufficient quantity either singly or by interaction with other wastes to injure or interfere with any wastewater treatment process, constitute a hazard to humans or animals, waters of the wastewater treatment plant, including but not limited to cyanides, hexavalent chromium, copper, zinc, cadmium, nickel, and phenols in the waste as discharged to the public sewer.
(a) The following concentrations shall not be exceeded in industrial wastes discharged to the public sewers: total cyanide (CN), 0.5 milligrams per liter (mg/l); hexavalent chromium, 1.0 mg/l; copper, 1.0 mg/l; zinc, 1.0 mg/l; cadmium, 0.2 mg/l; nickel, 2.0 mg/l; phenols, 0.2 mg/l; lead, 0.5 mg/l; mercury, 0.01 mg/l; silver, 0.2 mg/l.
(b) These maximum concentrations may be changed as necessary by the Superintendent or state regulatory agencies based on new information concerning inhibitory substances or to protect treatment plant processes. Industrial dischargers covered by federal pretreatment requirements shall meet those limitations specified under the effluent guidelines published under 33 U.S.C. §§ 1311(b) and 1317(b) of the Federal Act or the above concentrations, whichever is more stringent.
(5) Any waters or wastes containing odor-producing substances exceeding limits which may be established by the Superintendent or local or state regulatory agencies;
(6) Any radioactive wastes or isotopes of a half-life or concentration that may exceed limits in compliance with applicable state or federal regulations;
(7) Quantities of flow, concentrations, or both which constitute a “slug” as defined in § 51.015;
(8) Waters or wastes containing substances which are not amenable to treatment or reduction by the wastewater treatment processes employed, or are amenable only to such a degree that the wastewater treatment plant effluent cannot meet the requirements of other agencies having jurisdiction over discharge to the receiving waters; or substances that would result in a violation of the NPDES permit;
(9) Any water or wastes which, by interaction with other water 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; and
(10) Any wastes with objectionable color not removable by the treatment process.
(Ord. 15-79, passed 4-2-1979)