(A) 
General prohibitions.
(1) 
No person or user shall introduce or cause to be introduced into the POTW any pollutant or wastewater which causes pass through or interference.
(2) 
The sanitary sewer system shall be used for the discharge and/or disposal of wastewater, unless prohibited by this chapter, or exception is granted by the city or statute.
(3) 
No person or user shall discharge or deposit wastewater, liquid waste or pollutants on public or private property, in or adjacent to, any:
(a) 
Natural outlet into a watercourse, ditch, creek, stream, lake or other body of surface water or groundwater;
(b) 
Storm sewer inlet or conveyance that receives stormwater;
(c) 
Part of the storm drainage system of the city; or
(d) 
Other area within the jurisdiction of the city that could allow the pollutants, carried by stormwater, to deteriorate or diminish the water quality of surface water or groundwater.
(4) 
These general prohibitions apply to all persons or 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.
(5) 
Stormwater and all other unpolluted drainage shall be discharged to sewers that are specifically designated as storm sewers, or to a natural outlet approved by the DCO. No liquid, semi-liquid, ready mixed concrete, mortar, asphalt material, or chemical waste shall be deposited in any area that will drain to the storm sewer or natural outlet.
(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 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 with a pH of less than 5.5 or more than 11.0 standard units, 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, blockage, or damage to the POTW;
(4) 
Pollutants, including oxygen-demanding pollutants (BOD, etc.), released in a discharge at a flow rate 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, nonbiodegradable cutting oil, or products of mineral oil ongm, in amounts that will cause interference and/or pass through and in amounts specified in section 171.07 of this chapter.
(7) 
Pollutants which result in the presence of toxic gases, vapors, or fumes within the POTW in a quantity that may cause acute health and safety problems for POTW workers or the public;
(8) 
Trucked or hauled pollutants or wastewater, except at discharge points designated by the DCO and in accordance with chapter 172 of this code;
(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 sewers 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, thereby violating the applicable NPDES or TPDES permit;
(11) 
Wastewater containing any radioactive wastes or isotopes except in compliance with applicable state or federal regulations;
(12) 
Stormwater, surface water, groundwater, artesian well water, roof runoff, subsurface drainage, and unpolluted wastewater, unless specifically authorized by the DCO;
(13) 
Sludges, screenings, or other residues from the pretreatment of industrial wastes;
(14) 
Medical wastes, except as specifically authorized by the DCO that do not cause or contribute to pass through and/or interference;
(15) 
Wastewater causing, alone or in conjunction with other sources, the 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 or its effluent;
(17) 
Fats, oils, or greases of animal, vegetable or petroleum origin in concentrations greater than 200 mg/L;
(18) 
A discharge of water, normal domestic wastewater, or industrial waste which in quantity of flow exceeds, for a duration of longer than fifteen (15) minutes, more than four times the average 24-hour flow during normal operations of the industry;
(19) 
Pesticides (e.g., insecticides, herbicides, fungicides) in concentrations that are not amenable to treatment;
(20) 
Polychlorinated biphenyls;
(21) 
Garbage that is not properly shredded to such an extent that all particles will be carried freely under the flow conditions normally prevailing in wastewater mains, with no particle having greater than one-half (1/2) inch cross-sectional dimension;
(22) 
Wastewater or industrial waste generated or produced outside the city, unless approval in writing from the DCO has been given to the person discharging the waste; or
(23) 
Without the written approval of the DCO, a substance or pollutant other than industrial waste, normal domestic wastewater, septic tank waste or chemical toilet waste that is of a toxic or hazardous nature, regardless of whether or not it is amenable to treatment, including but not limited to bulk or packaged chemical products.
(C) 
Processing and storage.
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.
(Ordinance 4229 adopted 9/24/2024)
The categorical pretreatment standards found at 40 CFR Chapter I, Subchapter N, Parts 405-471 are hereby incorporated:
(A) 
Where a categorical pretreatment standard is expressed in terms of either the mass or the concentration of a pollutant in wastewater, the DCO may impose equivalent concentration or mass limits in accordance with 40 CFR 403.6(c)(1).
(B) 
When wastewater subject to a categorical pretreatment standard is mixed with wastewater not regulated by the same standard, the DCO shall impose an alternate limit using the combined waste stream formula in 40 CFR 403.6(e).
(C) 
A user may obtain a variance from a categorical pretreatment standard if the user can prove, pursuant to the procedural and substantive provisions in 40 CFR 403.13, that factors relating to its discharge are fundamentally different from the factors considered by the EPA when developing the categorical pretreatment standard.
(D) 
A user may obtain a net gross adjustment to a categorical standard in accordance with 40 CFR403.15.
(Ordinance 4229 adopted 9/24/2024)
(A) 
The following pollutant limits are established to protect against pass through and interference and apply at the point where the wastewater is discharged to the POTW. No person shall discharge, or cause or permit to be discharged, wastewater containing in excess of the following instantaneous maximum allowable discharge limits:
(1) 
0.2 mg/L arsenic.
(2) 
0.1 mg/L cadmium.
(3) 
2.1 mg/L chromium.
(4) 
1.8 mg/L copper.
(5) 
0.4 mg/L cyanide.
(6) 
1.2 mg/L lead.
(7) 
0.06 mg/L mercury.
(8) 
0.5 mg/L molybdenum.
(9) 
3.3 mg/L nickel.
(10) 
0.2 mg/L selenium.
(11) 
0.8 mg/L silver.
(12) 
6.1 mg/L zinc.
(B) 
All concentrations for metallic substances are for "total" metal unless indicated otherwise. The DCO may impose mass limitations in addition to, or in place of, the concentration-based limitations above.
(Ordinance 4229 adopted 9/24/2024)
The city reserves the right to establish, by or in wastewater discharge permits, changes to standards or requirements on discharges to the POTW.
(Ordinance 4229 adopted 9/24/2024)
(A) 
No user shall ever increase the use of process water, or in any way attempt to dilute a discharge, as a partial or complete substitute for adequate treatment to achieve compliance with a discharge limitation unless expressly authorized by an applicable pretreatment standard or requirement.
(B) 
The DCO may impose mass limitations on users who are using dilution to meet applicable pretreatment standards or requirements, or in other cases when the imposition of mass limitations is appropriate.
(Ordinance 4229 adopted 9/24/2024)
(A) 
No user shall discharge wastewater containing a biochemical oxygen demand (BOD) or total suspended solids (TSS) loading that causes the city's pro rata share of the total BOD or TSS loading to the POTW system to exceed the city's pro rata share of the total flow to the POTW system. (Example: if the city contributes 25% of the total wastewater flow to the POTW, the city's cumulative BOD or TSS loading to the POTW, as measured at the city's points of entry to the POTW, shall not exceed 25% of the total BOD or TSS loading to the POTW.)
(B) 
Any user with a wastewater strength that will cause the city's cumulative wastewater loading, at the city's points of entry, to exceed the city's pro rata share of the total wastewater loading based upon flow, shall be required to install pretreatment facilities to reduce its wastewater strength to an acceptable level.
(Ordinance 4229 adopted 9/24/2024)