(A) General prohibitions. No user shall introduce, or cause to be introduced into the POTW, any pollutant or wastewater which causes pass through, interference, the city to violate its NPDES permit or its biosolids management program. These general prohibitions apply to all users of the POTW whether or not they are subject to categorical pretreatment standards or any other federal, state, or local pretreatment standards or requirements.
(B) Specific prohibitions. No user shall introduce or cause to be introduced into the POTW the following pollutants, substances, or wastewater:
(1) Pollutants which create a fire or explosion hazard in the POTW, including but not limited to, wastestreams with a closed cup flash point of less than 140°F or 60°C using the test methods specified in 40 C.F.R. § 261.21;
(2) Wastewater having a pH less than 6.0, or more than 10.5 or otherwise causing corrosive structural damage to the POTW or equipment. The city may enforce a maximum pH of 9.0 for individual users if the Director determines that a discharge with a higher pH may be detrimental to the POTW;
(3) Solid or viscous substances in amounts or of such size which will cause obstruction of the flow in POTW or resulting in interference including any substance detrimental to or determined by the Director to be detrimental to the POTW;
(4) Pollutants, including oxygen-demanding pollutants (BOD and the like), released in a discharge at a flow rate and/or pollutant concentration which, either singly or by interaction with other pollutants, will cause interference with the POTW;
(5) Wastewater having a temperature greater than 120°F, or which will inhibit biological activity in the treatment plant resulting in interference, but in no case wastewater which causes the temperature at the head of a treatment plant to exceed 104°F or 40°C;
(6) Petroleum oil, nonbiodegradable cutting oil, or products of mineral oil origin in amounts that will cause interference or pass through;
(7) Pollutants which result in the presence of toxic gases, vapors, or fumes within the POTW in a quantity that may cause acute worker health and safety problems;
(8) Trucked or hauled pollutants, except at discharge points designated by the Director in accordance with § 51.038;
(9) Noxious or malodorous liquids, gases, solids, or other wastewater which, either singly or by interaction with other wastes, are sufficient to create a public nuisance or a hazard to life, or to prevent entry to the POTW for maintenance or repair;
(10) Wastewater which imparts color which cannot be removed by the treatment process, such as, but not limited to, dye wastes and vegetable tanning solutions, which consequently imparts color to the treatment plant’s effluent;
(11) Wastewater containing any radioactive wastes or isotopes except in compliance with applicable state or federal regulations;
(12) Sludges, screenings, or other residues from the pretreatment of industrial wastes;
(13) Medical wastes, except as specifically authorized by the Director in a wastewater discharge permit;
(14) Wastewater causing, alone or in conjunction with other sources, the treatment plant’s effluent to fail a toxicity test;
(15) Detergents, surface-active agents, or other substances which may cause excessive foaming in the POTW;
(16) Fats, oils, or greases of animal or vegetable origin in concentrations greater than 100 mg/l;
(17) Collectible floating fats, oils, or greases;
(18) Garbage that has not been properly shredded;
(19) Pollutants which cause a high concentration of inert suspended solids, such as, but not limited to, lime slurries, diatomaceous earth, and lime residues;
(20) Pollutants which cause high concentration of dissolved solids such as, but not limited to, sodium chloride;
(21) Pollutants which exert a COD that would increase operational expense or cause treatment problems;
(22) Pollutants which exert a high chlorine demand such as, but not limited to, nitrite, cyanide, thiocyanate, sulfite, and thiosulfate;
(23) Pollutants which result in water or waste materials containing toxic or poisonous substances that may damage or interfere with any sewage treatment process or that may constitute a hazard to any person, animal, fish or aquatic life, or that may be a hazard in the receiving waters of the state; and
(24) Any substance which may cause the POTW effluent or any other product of the POTW such as biosolids, residue, sludge, or scum to be unsuitable for reclamation and reuse or to interfere with the biosolids management, reuse, or reclamation process where the POTW is pursuing a biosolids, reuse, or reclamation program. In no case shall a substance be discharged to the POTW and cause the POTW to be in noncompliance with biosolids use or disposal criteria guidelines or regulations under applicable federal, state, or local law.
(C) Pollutants, substances, or wastewater prohibited by this section shall not be processed or stored in such a manner that they could be discharged to the POTW.
(Prior Code, § 51.23) (Ord. D-1635, passed 9-9-1991, effective 9-9-1991; Ord. D-1927, passed 7-15-2002, effective 8-1-2002)