(1) Any liquids, solids or gases that by reason of their 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 POTW or to the operation of the POTW. Wastewater discharges with a closed cup flashpoint of less than 140 degrees Fahrenheit or 60 degrees Celsius using the test methods specified in 40 C.F.R. § 261.21 are prohibited;

(2) Any solid or viscous substances that may cause obstruction to the flow in a sewer or other interferences with the operation of the wastewater treatment system facilities, such as, but not limited to, grease, 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 dusts, metal, glass, straw, shavings, grass clippings, rags, spent grains, spent hops, waste paper, wood, plastics, gas, tar asphalt residues, residues from refining or processing of fuel or lubricating oil, mud, or glass grinding or polishing wastes;

(3) Any wastewater having a pH less than six or greater than 10, except under conditions of continuous pH monitoring as specified in the City’s enforcement response plan. In no case shall a user be permitted to discharge wastewater having a pH of less than five, or wastewater having any corrosive property capable of causing damage or hazard to structures, equipment and/or personnel of the City;

(4) Any wastewater containing toxic pollutants in sufficient quantity, either singly or by interaction, to injure or interfere with any wastewater treatment system process, create a toxic effect on the receiving waters of the POTW, constitute a hazard to humans or animals, or to exceed the limitation set forth in categorical pretreatment standards;

(5) Pollutants that result in the presence of toxic gases, vapors or fumes within the POTW in a quantity that may cause acute worker health or safety problems;

(6) Any substance that may cause the POTW’s effluent or treatment residues, sludges or scums to be unsuitable for reclamation and reuse or to interfere with the reclamation process. (In no case shall a substance discharged to the POTW cause the POTW to be in noncompliance with sludge use or disposal criteria, guidelines or regulations developed under § 405 of the Act, any criteria, guidelines or regulations affecting sludge use or disposal developed pursuant to the Solid Waste Disposal Act, the Clean Air Act, the Toxic Substance Control Act or State standards applicable to the sludge management method being used.);

(7) Any substance that will cause the POTW to violate its NPDES and/or other disposal system permits;

(8) Any substance with objectionable color not removed in the treatment process, such as, but not limited to, dye wastes and vegetable tanning solutions;

(9) Any wastewater having a temperature that will inhibit biological activity in the POTW treatment plant resulting in interference but, in no case, wastewater that causes the temperature at the introduction into the treatment plant to exceed 104 degrees Fahrenheit (40 degrees Celsius). If, in the opinion of the City, lower temperatures of such wastes could harm either the sewers, wastewater treatment processes, or equipment; have an adverse effect on the receiving streams; or otherwise endanger life, health or property; or constitute a nuisance, the City may prohibit such discharges;

(10) Any unpolluted water including, but not limited to, storm water, surface water, groundwater, roof runoff, parking lot and subsurface drainage, noncontact cooling water and unpolluted wastewater, unless specifically authorized by the Public Works Director;

(11) Any wastewater containing any radioactive wastes or isotopes of such half-life or concentration as exceed limits established by the Director in compliance with applicable State or Federal regulations;

(12) Any wastewater containing pollutants, including oxygen-demanding pollutants, in sufficient quantity (flow or concentration), either singly or by interaction with other pollutants, to pass through or interfere with the POTW, any wastewater treatment or sludge process, or constitute a hazard to humans or animals;

(13) Wastewater containing substances not amenable to treatment or reduction by the wastewater treatment system processes employed, or are amenable to treatment only to such degree that the wastewater treatment plant effluent cannot meet the requirements of other agencies having jurisdiction over discharge to the receiving waters;

(14) Fats, wax, grease or oils, whether emulsified or not, containing substances that may solidify or become viscous at temperatures between 32 degrees Fahrenheit and 150 degrees Fahrenheit (zero degrees Celsius and 65 degrees Celsius);

(15) Any sludges, screenings or other residues from the pretreatment of industrial waste;

(16) Any hauled waste or septage, except at discharge points designated by the City and authorized in writing by the Director;

(17) Any wastewater causing the treatment plant effluent to demonstrate toxicity to test species during a biomonitoring evaluation;

(18) Any wastewater, residual solvents or solvent-contaminated waste from dry cleaning machines, as well as solvent-contaminated wastewater from any auxiliary operation at dry cleaning facilities; or

(19) Petroleum oil, nonbiodegradable cutting oil or products of mineral oil origin, in amounts that will cause interference or pass through. (Ord. 106 § 4(1), passed 10-9-2012; Code 2014 § 52.04(A))