(A) 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, wastestreams with a closed-cup flashpoint of less than 140°F (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 11.0 or otherwise causing corrosive structural damage to the POTW or equipment;
(3) Solid or viscous substances in amounts which will cause obstruction of the flow in the POTW resulting in interference, but in no case solids greater than three inches in any dimension;
(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 104°F (40°C) being discharged into the sewage system, unless prior written approval is obtained from the Industrial Pretreatment Coordinator, or which will inhibit biological activity in the POTW treatment plant resulting in interference, but in no case wastewater which causes the temperature at the introduction into the POTW treatment plant to exceed 104°F (40°C);
(6) Petroleum oil, nonbiodegradable cutting oil or products of mineral oil origin, in amounts that will cause interference or pass through, but in no case shall exceed a total oil and grease value of 300 mg/l or a total petroleum value of 100 mg/l;
(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 Industrial Pretreatment Coordinator in accordance with § 53.024;
(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 into the sewage system for maintenance or repair;
(10) Wastewater containing any radioactive wastes or isotopes except in compliance with this chapter and applicable state or federal regulations;
(11)
Wastewater containing true color from any source and of any hue greater than that of a 500 color unit platinum-cobalt stock standard, as determined by a USEPA approved analytical method. Any wastewater with sufficient color which is not removed in the POTW treatment process and causes the plant effluent to have a true color in excess of 100 color units on the platinum-cobalt scale, or its equivalent;
(12) Stormwater, surface water, ground water, artesian well water, roof runoff, subsurface drainage, noncontact cooling water and non-residential swimming pool drainage, unless specifically authorized by the Industrial Pretreatment Coordinator;
(13) Sludges, screenings or other residues from the pretreatment of industrial wastes;
(14) Medical wastes including biological hazards, except as specifically authorized by the Industrial Pretreatment Coordinator;
(15) Wastewater causing, alone or in conjunction with other sources, the POTW treatment plant’s effluent to fail a toxicity test;
(16) Detergents, surface-active agents or other substances which may cause excessive foaming in the POTW; and
(17) Any substance which will cause the POTW to violate its NPDES and/or state solid waste disposal permit, or air quality and/or receiving water quality standards.
(B) When the Industrial Pretreatment Coordinator determines that a user(s) is contributing to the POTW any of the above enumerated substances in such amounts as to cause interference with the operation of the POTW and/or POTW treatment plant, the Industrial Pretreatment Coordinator shall:
(1) Advise the user(s) of the impact of the contribution on the POTW and/or POTW treatment plant;
(2) Develop effluent limitation(s) for such user(s) to correct the interference with the POTW and/or POTW treatment plant; and
(3) Proceed with enforcement pursuant to the provisions of this chapter and Chapter 54 of this code of ordinances.
(C) Pollutants, substances or wastewater prohibited by this section shall not be processed or stored in such a manner that they have a reasonable potential to be discharged to the POTW.
(Res. 1998-10-18-A, passed 10-19-1998; Ord. 180, passed 12-21-1998; Ord. 285-2021, passed 9-7-2021)