(a) General prohibitions. No user shall introduce or cause to be introduced into the POTW any pollutant or wastewater which causes pass through or interference. These general prohibitions apply to all users of the POTW whether or not they are subject to Categorical Pretreatment Standards or any other national, state, or local pretreatment standards or requirements.
(b) National Pretreatment Standard 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 explosive hazard in the POTW, including, but not limited to, waste streams with a closed-cup flashpoint of less than 140° F (60° C) using the test methods specified in 40 CFR 261.21;
(2) Wastewater having a pH less than 6.0 or more than 11.0, or otherwise causing corrosive structural damage to the POTW or equipment;
(3) Any solid or viscous substances, (including but not limited to: garbage that has not been properly shredded, ashes, cinders, sand, mud, straw, shavings, metal, glass, rags, feathers, tar, plastics, wood, paunch manure) capable of causing obstruction of the flow to the POTW or resulting in interference;
(4) Pollutants, including oxygen-demanding pollutants (BOD, etc.), 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 150° F (65° C), or which will inhibit biological activity in the treatment plant resulting in interference, but in no case wastewater which causes the temperature at the introduction into the treatment plant to exceed 104° F (40° C);
(6) Petroleum oil, non-biodegradable 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) Any trucked or hauled pollutants, except as permitted under § 1042.14 of this chapter and at the discharge point designated by the Superintendent;
(c) Local prohibitions. Except as hereinafter provided, no user shall introduce or cause to be introduced into the POTW the following pollutants, substances, or wastewater:
(1) Any substance which will cause the POTW to violate its NPDES permit and/or cause treatment residue, sludges or scums to be unsuitable for reclamation and reuse or to interfere with the reclamation process;
(2) Any gasoline, benzene, naphtha, fuel oil, motor oil, or other flammable or explosive liquid, solid or gas;
(3) Any noxious or malodorous gas or substance capable of creating a public nuisance, or substances causing the release of noxious or poisonous gases after discharge into the public sewer system;
(4) Any wastes or waters containing a toxic or poisonous substance in sufficient quantity to injure or interfere with any sewage treatment process, constitute a hazard to humans or animals, or create any hazard in the receiving waters of the sewage treatment plant, such as cyanides, radioactive substances, isotopes and similar materials;
(5) Any waters or wastes containing suspended solids of such character and quantity that unusual attention or expense is required to handle the materials at the sewage treatment plant, or having a chlorine demand greater than 30 mg/l;
(6) Wastewater which imparts objectionable color which cannot be removed by the POTW treatment process, such as, but not limited to: dye wastes and tanning solutions;
(7) Storm water, surface water, ground water, artesian well water, roof runoff, subsurface drainage, swimming pool drainage, condensate, deionized water, noncontact cooling water, or unpolluted wastewater, unless specifically authorized by the Superintendent;
(8) Sludges, screenings, or other residues from the pretreatment of industrial wastes;
(9) Medical wastes, except as specifically authorized by the Superintendent in an individual wastewater discharge permit;
(10) Any wastewater which contains fats, oils, or greases of animal or vegetable origin in concentrations greater than 50 mg/l;
(11) Any slug load or slug discharge as defined in § 1042.02 of this chapter including oxygen demanding pollutants, released in a single discharge episode of such volume or strength as to cause interference to the POTW;
(12) Any waters or wastes having a five-day BOD greater than 300 mg/l by weight, or containing more than 350 mg/l by weight of suspended solids, or containing any quantity of substances having the characteristics described herein, or having an average daily flow greater than 22% of the average daily sewage flow of the city, without the review and approval of the Superintendent.
(d) 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.
(Ord. 32-84, passed 4-15-1985; Ord. 74-2000, passed 1-2-2001; Ord. 27-2017, passed 12-4-2017)