[Code 1993, § 13.21(1)]
(a) 
No user shall, directly or indirectly, contribute, or cause to be contributed, any pollutant or wastewater which will interfere with the operation or performance of the POTW. Such general prohibitions apply to all users of a POTW, whether or not the users are subject to National Categorical Pretreatment Standards or any other national, state or local pretreatment standards or requirements. A user may not contribute the following substances to any POTW:
(1) 
Any liquids, solids or gases which, 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 the operation of the POTW. At no time shall two successive readings on an explosion hazard meter, at the point of discharge into the system or at any point in the system, be more than 15%, nor any single reading over 30% of the lower explosive limit (LEL) of the meter for the specific chemical. Prohibited materials include, but are not limited to, gasoline, kerosene, naphtha, benzene, toluene, xylene, ether, alcohol, ketone, aldehyde, peroxide, chlorate, perchlorate, bromate, carbide, hydride, sulfide and any other substance which the utility, the state or EPA has notified the user is a fire hazard or a hazard to the system.
(2) 
Solid or viscous substances which may cause obstruction to the flow in a sewer or other interference with the operation of the wastewater treatment facilities, such as, but not limited to, grease, particles with sufficient dimensions or quantity, either alone or in combination with other particles, to obstruct the wastewater flow, animal guts or tissues, paunch manure, bones, hair, hides or fleshings, entrails, whole blood, feathers, ashes, cinders, sand, spent lime, stone or marble dust, metals, glass, straw, shavings, grass clippings, rags, spent grains, spent hops, wastepaper, 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 entering the municipal sanitary sewer system having a pH less than 5.0, or wastewater having any other corrosive property capable of causing damage or hazard to structures, equipment and/or personnel of the POTW.
(4) 
Any wastewater entering the municipal sanitary sewer system having a pH in excess of 10.0.
(5) 
Any wastewater containing toxic pollutants in sufficient quantity, either singly or by interaction with other pollutants, to injure or interfere with any wastewater treatment process, constitute a hazard to humans or animals, create a toxic effect in the receiving waters of the POTW, or exceed the limitation set forth in categorical pretreatment standards. A toxic pollutant shall include, but not be limited to, any pollutant identified pursuant to 307(a) of the act.
(6) 
Any noxious or malodorous liquid, gas or solid which, either singly or by interaction with other wastes, is sufficient to create a public nuisance or hazard to life, or is sufficient to prevent entry into the sewers for maintenance and repair.
(7) 
Any substance which may cause the POTW's effluent or any other product to the POTW, such as 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 Substances Control Act or state or local criteria applicable to the sludge management method being used.
(8) 
Any substance which will cause the POTW to violate its WPDES permit or the receiving water quality standards.
(9) 
Any wastewater with objectionable color not removed in the treatment process, such as, but not limited to, dye wastes and vegetable tanning solutions.
(10) 
Any wastewater having a temperature which will inhibit biological activity in the POTW treatment plant, resulting in interference, but, in no case, wastewater with a temperature which is lower than 32° F. (0° C.) or exceeds 150° F. (65.6° C.) at the discharge point from the source to the sanitary sewer system. The temperature shall not exceed 104° F. (40° C.) at the POTW wastewater treatment plant.
(11) 
Any pollutants, including oxygen demand pollutants (BOD, etc.), released at a flow rate and/or pollutant concentration which will cause interference to the POTW and/or which would constitute a slug.
(12) 
Any unpolluted water, including, but not limited to, cooling water, stormwater or groundwater.
(13) 
Wastewater containing inert suspended solids, such as, but not limited to, Fuller's earth, lime slurries and lime residues, or dissolved solids, such as, but not limited to, sodium chloride and sodium sulfate, in such quantities that would cause interference with the wastewater disposal system.
(14) 
Any wastewater containing any radioactive wastes or isotopes of such half-life or concentration as may exceed limits established in compliance with applicable state or federal regulations.
(15) 
Any wastewater which causes a hazard to human life or creates a public nuisance.
(b) 
When the general manager determines that a user is contributing to the POTW any of the substances enumerated in Subsection (a) of this section in such amounts as to interfere with the operation of the POTW, the general manager shall:
(1) 
Notify the user and board of standards.
(2) 
Develop effluent limits for such user to correct the interference with the POTW.
(3) 
Take immediate action, if necessary, to eliminate interference.
[Code 1993, § 13.21(2)]
Upon the promulgation of the categorical pretreatment standards for a particular industrial subcategory, the categorical pretreatment standards, if more stringent than limitations imposed under this article for sources in the subcategory, shall immediately supersede the limitations imposed under this article. The general manager shall notify all affected users of the applicable reporting requirements under 40 CFR 403.12.
[Code 1993, § 13.21(3)]
Where the utility's wastewater treatment system achieves consistent removal of pollutants limited by categorical pretreatment standards, the utility may apply to the approval authority for modification of specific limits in the categorical pretreatment standards. If consistent removal of pollutants can be achieved at the POTW, the utility may then modify pollutant discharge limits in the categorical pretreatment standards, if the requirements contained in 40 CFR 403.7 are fulfilled and prior approval from the approval authority is obtained.
[Code 1993, § 13.21(4)]
(a) 
No user shall discharge wastewater containing pollutants in excess of the following amounts:
(1) 
Limits. Limits for flow proportional sampling procedures and batch discharges or grab samples, when necessary:
Total cadmium
(no user shall discharge more than 0.1 pounds per day)
0.07 mg/l
Total chromium
14.00 mg/l
Total copper
4.50 mg/l
Total lead
1.38 mg/l
Total mercury
0.10 mg/l
Total nickel
4.10 mg/l
Total zinc
8.40 mg/l
(2) 
Grab samples.
a. 
Any wastewater containing fats, wax, grease or oils, whether emulsified or not, in excess of 200 mg/l, as measured by EPA method 413.1, or containing substances which may solidify or become viscous at temperatures between 32° — 150° F. (0-65.6° C.).
b. 
Total cyanide of 1.9 mg/l.
(b) 
The general manager shall be able to modify the limitations set forth in Subsection (a) of this section as long as such limitations do not violate state or federal laws.
(c) 
Any variance request for fat, wax, grease or oil limitations as set forth in Subsection (a)(2) of this section shall be submitted to the general manager. The variance request shall be based upon the criteria enumerated in 40 CFR 403.13. If a variance is granted, the general manager will have sole discretion on whether to accept alternative testing procedures for the variance.
[Code 1993, § 13.21(5)]
State requirements and discharge limitations shall apply in any case where such requirements and limitations are more stringent than federal requirements and limitations or those set forth in this article.
[Code 1993, § 13.21(6)]
The utility reserves the right to establish, by ordinance, more stringent limitations or requirements on discharges to the POTW, if deemed necessary to comply with the objectives presented in § 82-161.
[Code 1993, § 13.21(7)]
No user shall increase the use of process water or attempt to dilute a discharge as a partial or complete substitute for adequate treatment to achieve compliance with the limitations contained in the categorical pretreatment standards or this article.
[Code 1993, § 13.21(8)]
Each industrial user shall provide protection from accidental discharge of prohibited materials or other substances regulated by this article. Facilities to prevent accidental discharge of prohibited materials shall be provided and maintained at the user's own expense.
[Code 1993, § 13.21(9)]
A notice advising employees whom to call if a dangerous discharge occurs shall be permanently posted on the industrial user's bulletin board or other prominent place. Employers shall ensure that all employees who may cause such a dangerous discharge to occur, or who may suffer from such a discharge, are advised of the emergency notification procedure.