Sec. 19-2-1. General discharge prohibitions.

(a) It is unlawful for any user to discharge, contribute, or cause to be contributed, directly or indirectly, any pollutant, or wastewater at any flow rate or concentration which will cause interference with the operation or performance of the WPCF or which would cause the WPCF to be in violation of its NPDES permit. These general prohibitions apply to all users of the WPCF whether or not the user is subject to pretreatment standards or any other national, state or local pretreatment requirements.
(b) It is unlawful for any user to discharge the following substances to the WPCF:
(1) Chlorine Demand. Any wastewater requiring an excessive quantity of chlorine or other chemical compound used for disinfection purposes.
(2) Corrosive Substances. Any wastewater having a pH lower than 5.0 or having any other corrosive property capable of causing damage or hazard to structures, equipment or personnel of the city.
(3) Dilution Water. Any water added to wastewater for the purpose of diluting wastes which would otherwise exceed applicable maximum concentration limitations.
(4) Discoloration. Any wastewater with objectionable color not removed in the treatment process, such as, but not limited to, dye wastes and vegetable tanning solutions.
(5) Flammable or Explosive Substances. Any liquids, solids or gases which by reason of the nature or quantity are, or may be, sufficient either alone or by interaction with other substances, to cause fire or explosion, or be injurious in any other way to the WPCF or to the operation of the WPCF, or which exceed a flashpoint limit of one hundred forty degrees F or sixty degrees C (using the test methods specified in 40 CFR 261.21). At no time shall two successive readings on an explosion hazard meter, at the point of discharge into the sewage system (or at any point in the sewage system), be more than five percent nor any single reading over ten percent of the lower explosive limit (LEL) of the meter. Prohibited materials include, but are not limited to: gasoline, kerosene, naphtha, benzene, toluene, xylene, ethers, alcohols, ketones, aldehydes, peroxides, chlorates, perchlorates, bromates, carbides, hydrides and sulfides and any other substances in any quantity or concentration that the city, the state or the EPA has notified the user is a fire hazard or a hazard to the WPCF.
(6) Insecticides. Any wastewater containing algaecides, fungicides, antibiotics, insecticides, strong oxidizing agents or strong reducing agents in such quantity or strength as to cause or contribute to violations of the WPCF's NPDES discharge restrictions, interference with or upset of the WPCF, or personnel safety hazards.
(7) Medical Waste. Any wastewater containing medical wastes including, but not limited to, isolation wastes, infectious agents, human blood and blood products, pathological wastes, sharps, body parts, contaminated bedding, surgical wastes, potentially contaminated laboratory wastes, or dialysis wastes except as specifically authorized by the director in a wastewater discharge permit.
(8) Noxious or Malodorous Substances. Any noxious or malodorous liquids, gases, or solids which either singly or by interaction with other wastes are sufficient to create a public nuisance or hazard to life, or are sufficient to prevent entry into the WPCF for maintenance and repair.
(9) Pollutants and BOD. Any wastewater containing pollutants, including oxygen demanding pollutants (BOD, etc.), wastes containing suspended solids, or exerting a chlorine demand released at a flow rate and/or pollutant contamination which will cause interference to the WPCF, or which will cause or contribute significantly to violations of the WPCF NPDES limits.
(10) Slug Discharges. Any slug discharge having a flow rate, or containing concentrations or quantities of pollutants which will (1) cause interference with the operation or performance of the WPCF; or (2) exceed for any time period longer than fifteen minutes, more than five times the average twenty-four-hour concentration, quantity or flow during normal user operations.
(11) Public Nuisance. Any wastewater that causes a hazard to human life or creates a public nuisance.
(12) Radioactive Wastes. Any wastewater containing radioactive wastes or isotopes of such half-life or concentration as may exceed limits established by the director in compliance with any applicable state or federal regulations.
(13) Solids or Viscous Matter. Any solid or viscous substances which may cause obstruction to the flow in a sewer or other interference with the operation of the WPCF such as but not limited to: grease or fat, garbage with particles greater than one-half inch in any dimension, animal guts or tissues, paunch manure, bones, hair, hides or fleshings, entrails, whole blood, feathers, ashes, cinders, sand, spent lime, stone or marble dust, metal, glass, straw, shavings, grass clippings, rags, spent grains, spent hops, wastepaper, wood, plastics, gas, tar, asphalt residues, residues from refining, or processing of fuel or lubricating oil, mud, or glass grinding or polishing wastes.
(14) Storm and Cooling Water. Any rainwater, stormwater, groundwater, street drainage, subsurface drainage, yard drainage, including evaporative type air cooler discharge water and noncontact cooling water.
(15) Sulfides. Any wastewater containing sulfides in sufficient quantity or strength as to cause or contribute to WPCF corrosion, worker or public safety hazard, interference or upset of the WPCF, or violations of the WPCF's NPDES permit.
(16) Temperature. Any liquid, vapor, solid, gas, wastewater or substance having or developing a temperature which will inhibit biological activity in the WPCF resulting in interference; but, in no case, wastewater with a temperature, at introduction into the WPCF, which exceeds one hundred four degrees F (forty degrees C).
(17) Toxic Substances. Any wastewater containing toxic pollutants, gases, vapors, or fumes in sufficient quantity, either singly or by interaction with other pollutants, which may injure or interfere with any wastewater treatment process, cause acute worker health and safety problems, constitute a hazard to humans or animals, create a toxic effect in the receiving waters of the WPCF, result in exceedances of sludge disposal restrictions, or exceed the limitation set forth in a pretreatment standard or pretreatment regulation. A toxic pollutant shall include, but not be limited to, any pollutant identified pursuant to Section 307(a) of the Act.
(18) Trucked/Hauled Wastes. The discharge of hauled or trucked pollutants, except at points which the director shall designate in accordance with Section 19-3-3, or as permitted by the director as part of the elimination or decommissioning of a septic tank within the city.
(19) Unsuitable Wastes. Any substance which my cause the WPCF's effluent, or any other product of the WPCF such as residues, sludges or scums, to be unsuitable for reclamation and reuse or which may interfere with the reclamation process. In no case shall a substance discharged to the WPCF cause the WPCF to be in noncompliance with sludge use or disposal criteria, guidelines or regulations developed under federal law, including, but not limited to, Section 405 of the Act, any criteria, guidelines or regulations affecting sludge use or disposal developed pursuant to the Solid Waste Disposal Act (42 USC Section 6901 et seq.), the Clean Air Act (42 USC Section 7401 et seq.), the Toxic Substances Control Act (15 USC Section 2601 et seq.) or state criteria applicable to the sludge management method being used.
(20) Pass Through Substances. Any substance or discharge which will pass through the WPCF in quantities or concentrations that, alone or with discharges from other sources, may cause a violation of the WPCF's NPDES permit or the receiving water quality standards.
(21) Petroleum. Any petroleum oil, any nonbiodegradable cutting oil, or any amounts of products of mineral oil origin which may cause interference or pass through. (Ord. No. 1271, § 1 (part); Ord. No. 1286, § 1.)