(a) 
General prohibitions.
No user shall introduce or cause to be introduced into the wastewater treatment plant any pollutant or wastewater which causes pass-through or interference. These general prohibitions apply to all users of the wastewater treatment plant whether or not they are permit holders or SIUs.
(b) 
Specific prohibitions.
No user shall introduce or cause to be introduced into the wastewater treatment plant the following pollutants, substances, or wastewater:
(1) 
Pollutants which create a fire or explosive hazard in the wastewater treatment plant, 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 5.5 or more than 10.0, or otherwise causing corrosive structural damage to the wastewater treatment plant or equipment;
(3) 
Solid or viscous substances in amounts which will cause obstruction of the flow in the wastewater treatment plant resulting in interference;
(4) 
Wastewater having a temperature greater than 150° F (49° C), or which will inhibit biological activity in the treatment plant resulting in interference;
(5) 
Petroleum oil, nonbiodegradable cutting oil, or products of mineral oil origin, in amounts that will cause interference or pass-through;
(6) 
Pollutants which result in the presence of toxic gases, vapors, or fumes within the wastewater treatment plant in a quantity that may cause acute worker health and safety problems;
(7) 
Trucked or hauled pollutants, except at discharge points designated by the city manager in accordance with this article;
(8) 
Noxious or odorous liquids, gases, solids, or other wastewater which, either singly or by interacting with other wastewater, is sufficient to create a public nuisance or a hazard to life, including pesticides, herbicides and fungicides;
(9) 
Wastewater which imparts color which cannot be removed by the treatment process, such as, but not limited to, dye waste and vegetable tanning solutions, which consequently imparts color to the treatment plant effluent;
(10) 
Wastewater containing any radioactive wastewater or isotopes, except in compliance with applicable state or federal regulations;
(11) 
Stormwater, surface water, groundwater, artesian well water, roof runoff, subsurface drainage, swimming pool drainage, condensate, deionized water, noncontact cooling water, and unpolluted wastewater, unless specifically authorized by the city manager;
(12) 
Sludges, screening, or other residues from the pretreatment of industrial wastes;
(13) 
Medical wastes, except as specifically authorized by the city manager in a wastewater discharge permit;
(14) 
Wastewater causing, alone or in conjunction with other sources, the treatment plant’s effluent to fail a toxicity test;
(15) 
Detergents, surface-active agents, or other substances which may cause excessive foaming in the treatment plant.
(c) 
Handling of prohibited substances.
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 wastewater plant.
(Ordinance 395, sec. 1, adopted 7/21/15)
All users of the wastewater collection system which meet the definitions of categorical industries in the national categorical pretreatment standards shall pretreat their industrial wastewater if the standards require them to do so. The categorical pretreatment standards found at 40 CFR chapter I, subchapter N, parts 405–471, are hereby incorporated. These federal regulations apply to specific industries to limit the amount of pollutants discharged to the public wastewater collection and treatment system.
(Ordinance 395, sec. 1, adopted 7/21/15)
(a) 
The following pollutant limits are established to protect against pass-through and interference. No person shall discharge wastewater containing in excess of the following:
 
Instantaneous Maximum Allowable Discharge Limit
(mg/l)
Maximum for 24-hour Composite Sample
(mg/l)
Arsenic
0.05
0.01
Barium
5.0
1.0
BOD
2,000
1,000
Cadmium
0.7
0.1
Chromium
5.0
1.0
Copper
4.5
1.0
Cyanide
2.0
0.5
Lead
0.1
0.02
Mercury
0.005
0.002
Nickel
1.0
0.2
O&G
400
200
Selenium
0.4
0.1
Silver
1.0
0.2
TSS
2,000
1,000
Zinc
5.0
1.0
(b) 
The above limits apply at the point where the wastewater is discharged to the public collection system. All concentrations for metallic substances are for “total” metal unless indicated otherwise. The city manager may impose mass limitations in addition to, or in place of, the concentration-based limitation above.
(c) 
The city reserves the right to establish, by ordinance or in wastewater discharge permits, more stringent standards or requirements on discharges to the treatment plant.
(Ordinance 395, sec. 1, adopted 7/21/15)
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. The city manager may impose mass limitations on users which are using dilution to meet applicable pretreatment standards or requirements, or in other cases when the imposition of mass limitations is appropriate.
(Ordinance 395, sec. 1, adopted 7/21/15)