(a) 
No person may introduce into a POTW any pollutant which may pass through or interfere. Also prohibited are any substances that have an adverse effect on the environment, or may endanger life, health or property, or constitute a public nuisance.
(b) 
Substances specifically prohibited from being discharged into the sewage system are as follows:
(1) 
Any liquids, solids or gases, including but not limited to, gasoline, kerosene, naphtha, benzene, toluene, xylene, ethers, alcohols, ketones, aldehydes, peroxides, chlorates, perchlorates, bromates, carbides, hydrides, sulfides or any other substances which are a fire or other hazard to the system, which by reason of their nature or quantity are, or may be, sufficient either alone or by interaction with other substances to cause fires or explosions or be injurious in any other way to the facilities or operation of the sewage system.
(2) 
Any substance which creates a fire or explosion hazard in the sewage system, including, but not limited to, wastestreams with a closed cup flashpoint of less than 140 degrees Fahrenheit or 60 degrees Celsius using the test methods specified in 40 CFR 261.21.
(3) 
Any wastewater having a pH less than 5.0, greater than 10.5, or any wastewater having any other corrosive property capable of causing damage or hazard to the sewage system or any person.
(4) 
Any wastewater containing 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/or safety problems.
(5) 
Any liquid or vapor having a temperature higher than 150 degrees Fahrenheit (65 degrees Celsius) or exhibiting heat in amounts which will inhibit biological activity in the POTW causing an interference or, in any case, exhibiting heat in such quantities that the temperature at the POTW treatment plant exceeds 40 degrees Celsius (104 degrees Fahrenheit).
(6) 
Any pollutant, including oxygen-demanding pollutants (COD, and the like) and total dissolved solids, released in a discharge at a flow rate and/or pollutant concentration which will cause pass-through or interference at the POTW or which will cause the POTW to be in noncompliance with any federal or state sludge use or disposal criteria, guidelines or regulations.
(7) 
Any free or emulsified fats, waxes, greases or oils containing substances which may solidify or become viscous at temperatures between 32 and 150 degrees Fahrenheit (zero and 65 degrees Celsius); or any combination of free or emulsified fats, waxes, greases or oils, if, in the opinion of the control authority, it appears probable that such wastes:
(A) 
Can deposit grease or oil in the sewer system in such a manner as to clog the sewers;
(B) 
Can overload skimming and grease-handling equipment;
(C) 
Are not amenable to bacterial action and will therefore pass to the receiving water without being affected by normal sewage treatment processes;
(D) 
Can have deleterious effects on the treatment process due to excessive quantities.
(8) 
Petroleum oil, nonbiodegradable cutting oil, or products of mineral oil origin in amounts that will cause interference or pass-through.
(9) 
Solid or liquid substances which may cause obstruction to the flow in sewers or other interference with the proper operation of the wastewater treatment facilities such as, but not limited to, ashes, cinders, sand, mud, straw, shavings, metal, glass, rags, feathers, tar, plastics, wood, whole blood, paunch manure, hair and fleshings, entrails, lime slurry, lime residues, slops, chemical residues, paint residues, bulk solids or waste paper.
(10) 
Any noxious or malodorous liquids, gases or solids which either singly or by interaction with other substances are sufficient to prevent entry into the sewer system for maintenance and repair.
(11) 
Wastewater containing COD in concentrations which are not amenable to treatment, or any other substance which is determined by the environmental officer and/or POTW to be not amenable to treatment.
(12) 
Any trucked or hauled pollutants, except at discharge points designated by the city.
(13) 
Pollutant which causes:
(A) 
Excessive discoloration;
(B) 
High hydrogen sulfide content;
(C) 
Unusual taste- or odor-producing substances.
(c) 
In cases where, and in the opinion of the environmental officer and/or POTW, the character of the sewage from any manufacturer or industrial plant building or other premises is such that it will damage the system, or cannot be treated satisfactorily in the system, the environmental officer shall have the right to require such user to dispose of such waste otherwise and prevent it from entering the sewage system.
(d) 
Unusual flow and concentration of any of the above shall be pretreated to a concentration acceptable to the city, if such wastes can:
(1) 
Cause damage to sewer system;
(2) 
Impair processes;
(3) 
Incur treatment cost exceeding those of normal sewage;
(4) 
Render the water unfit for stream disposal or industrial use; or
(5) 
Create a public nuisance.
(1993 Code, sec. 52.020; 2006 Code, sec. 82-241; Ordinance 336, sec. 2, adopted 6/1/92)
(a) 
It shall be unlawful to discharge into the sewer system any metals, chemicals or toxic substances in excess of the following concentration limits:
(1) 
The following heavy metals and toxic materials in the form of compounds or elements in solution or suspension in concentrations exceeding these limits:
Parameter
Monthly Average Limit
(mg/)l
Arsenic (total)
1.00
Cadmium (total)
0.11
Chromium (total)
2.77
Copper (total)
2.07
Cyanide (total)
0.65
Lead (total)
0.69
Mercury (total)
0.011
Nickel (total)
2.38
Zinc (total)
2.61
(2) 
All other priority pollutants found in the POTW influent at a concentration at or above 0.1 mg/l and all numerical aquatic life criteria as defined by the state commission on environmental quality, including, but not limited to the following, shall be excluded from the wastewater system unless a permit specifying the conditions of pretreatment, concentration, volumes, and the like, is obtained from the city:
Aldrin
Aluminum
Carbaryl
Chlordane
Chlorpyrifos
DDT
Demeton
Dieldron
Endosulfan
Guthion
Heptachlor
Hexachlorocyclohexane
Malathion
Methoxychlor
Mirex
PCB (total)
Parathion
Phenanthrene
Pentachlorophenol
Selenium
Silver (free ion)
Toxaphene
Tributyltin
2-4-5 Trichlorophenol
(3) 
Any radioactive wastes or isotopes without prior written permission from the environmental officer.
(b) 
Except where expressly authorized to do so by an applicable pretreatment standard or requirement, no industrial user shall ever increase the use of process water or in any other way attempt to dilute a discharge as a partial or complete substitute for adequate requirement. The control authority may impose mass limitations on industrial users which are using dilution to meet applicable pretreatment standards or requirements, or in other cases where the imposition of mass limitations is appropriate.
(c) 
Upon the promulgation of federal categorical pretreatment standards for a particular industrial subcategory, the federal pretreatment standard, if more stringent than specific limitations imposed under this article for industrial users subject to the federal standard, shall supersede the limitations imposed under this article.
(d) 
Where industrial users combine wastestreams prior to treatment, compliance with an applicable categorical standard will be determined either prior to combining the wastestreams or following treatment of the combined wastestream (by applying the combined wastestream formula found in 40 CFR 403.6(e)).
(e) 
If any person discharges a substance into the city’s sewer system in violation of this section, the environmental officer may terminate the service of sewer and/or water to the premises from which the substance was discharged.
(1993 Code, sec. 52.021; 2006 Code, sec. 82-242; Ordinance 336, sec. 3, adopted 6/1/92)
(a) 
No person shall discharge garbage into the sewer system unless it is shredded to a degree that all particles can be carried freely under the flow conditions normally prevailing in the sewer system. Particles greater than one-half inch in any dimension are prohibited.
(b) 
The city is entitled to review and approve the installation and operation of any garbage grinder equipped with a motor of three-fourths horsepower (0.76 hp metric) or greater.
(1993 Code, sec. 52.022; 2006 Code, sec. 82-243; Ordinance 336, sec. 4, adopted 6/1/92)
(a) 
Discharges requiring a trap include any nonresidential establishment discharging:
(1) 
Grease or water containing grease;
(2) 
Oil;
(3) 
Sand;
(4) 
Flammable wastes; or
(5) 
Other harmful substances.
(b) 
Any person responsible for discharges requiring a trap shall at their own expense and as required by the environmental officer:
(1) 
Provide equipment and facilities of a type and capacity approved by the city.
(2) 
Locate the trap in a manner that provides ready and easy accessibility for cleaning and inspection.
(3) 
Maintain the trap in effective and operating condition.
(1993 Code, sec. 52.023; 2006 Code, sec. 82-244; Ordinance 336, sec. 5, adopted 6/1/92)
(a) 
Each industrial user shall provide protection from slug discharges. The control authority may require the industrial user to develop and implement a slug control plan. The plan shall contain, at a minimum, the following elements:
(1) 
Description of discharge practices, including nonroutine batch discharges;
(2) 
Description of stored chemicals;
(3) 
Procedures for immediately notifying the POTW of slug discharges, including any discharge that would violate a prohibition under 40 CFR 403.5, with procedures for follow-up written notification within five days.
(b) 
If necessary, procedures to prevent adverse impact from accidental spills, including inspection and maintenance of storage areas, handling and transfer of materials, loading and unloading operations, control of plant site runoff, worker training, building of containment structures or equipment, measures for containing toxic organic pollutants (including solvents), and/or measures and equipment for emergency response.
(1993 Code, sec. 52.024; 2006 Code, sec. 82-245; Ordinance 336, sec. 29, adopted 6/1/92)
All categorical and noncategorical industrial users shall notify the POTW and the city immediately of all discharges that could cause problems to the POTW, including any slug loadings, by the industrial user.
(1993 Code, sec. 52.025; 2006 Code, sec. 82-246; Ordinance 336, sec. 30, adopted 6/1/92)
The control authority, after informal notice to the discharger, can immediately and effectively halt or prevent any discharge of pollutants which reasonably appears to present an imminent endangerment to the health or welfare of persons. The control authority, after notice to the affected industrial users and an opportunity to respond, can halt or prevent any discharge to the POTW which presents or may present an endangerment to the environment or which threatens to interfere with the operation of the POTW.
(1993 Code, sec. 52.026; 2006 Code, sec. 82-247; Ordinance 336, sec. 35, adopted 6/1/92)
(a) 
A surcharge may be applied in addition to the monthly sewer service charge for the discharge of above normal strength wastewater to cover the additional costs of treating such wastewater. Such a charge is collected by the city.
(b) 
The surcharge shall be calculated as follows:
C = [B (Bu - 250) + S (Su - 250)] x F x V
Where:
C = Surcharge to the user in dollars.
B = Unit cost factor for treating one unit of BOD (per 1,000 gallons).
Bu = The tested BOD of the discharge.
S = Unit cost factor for treating one unit of total suspended solids (per 1,000 gallons). Su = The tested total suspended solids of the discharge.
F = A factor of 8.34 to convert mg/l to pounds/gallon.
V = Monthly billing volume (discharge) in thousand gallons.
250 = Average domestic BOD and total suspended solids (250 mg/l).
(1993 Code, sec. 52.027; 2006 Code, sec. 82-248; Ordinance 336, sec. 22, adopted 6/1/92)