A. General Prohibitions: No user may introduce or cause to be introduced into the POTW any pollutant or wastewater which causes pass-through or interference. These general prohibitions apply to all 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.
B. Specific Prohibitions: No user may 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 one hundred forty degrees Fahrenheit (140°F) (60°C) using the test methods specified in 40 CFR 261.21; or
2. Wastewater having a pH less than 6 or more than 12, or otherwise causing corrosive structural damage to the POTW or equipment; or
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 one-half inch (1/2"); or
4. Pollutants, including oxygen demanding pollutants (BOD, etc.), 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; or
5. Wastewater having a temperature 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 one hundred four degrees Fahrenheit (104°F) (40°C) unless the approval authority, upon the request of the POTW, approves alternate temperature limits; or
6. Petroleum oil, non-biodegradable cutting oil, or products of mineral oil origin, in amounts that will cause interference or pass-through; or
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; or
8. Recreational Vehicles (RV). Trucked or hauled pollutants, except at discharge points designated by the City in accordance with section 13.20.2.12 of this chapter; or
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; or
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 City's IPDES permit. Color (in combination with turbidity) shall not cause the treatment plant effluent to reduce the depth of the compensation point for photosynthetic activity by more than ten percent (10%) from the seasonably established norm for aquatic life; or
11. Wastewater containing any radioactive wastes or isotopes except as specifically approved by the Superintendent in compliance with applicable State or Federal regulations; or
12. Stormwater, surface water, groundwater, artesian well water, roof runoff, subsurface drainage, condensate greater than twenty (20) gallons per day, deionized water, noncontact cooling water greater than twenty (20) gallons per day, and unpolluted wastewater, unless specifically authorized by the Superintendent; or
13. Sludges, screenings, or other residues from the pretreatment of industrial wastes; or
14. Medical wastes, except as specifically authorized by the Superintendent; or
15. Wastewater causing, alone or in conjunction with other sources, the treatment plant's effluent to fail a toxicity test; or
16. Detergents, surface active agents, or other substances which may cause excessive foaming in the POTW; or
17. Any liquid, 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 to the operation of the POTW. At no time shall two (2) successive readings on an explosion meter, at the point of discharge into the system (or at any point in the system), be more than five percent (5%) nor any single reading over ten percent (10%) of the lower explosive limit (LEL) of the meter; or
18. Grease, animal guts or tissues, paunch manure, bones, hair, hides or fleshings, entrails, whole blood, feathers, ashes, cinders, sand, spent lime, stone or marble dusts, metal, 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; or
19. Any substance which will cause the POTW to violate its IPDES and/or other disposal system permits; or
20. Any wastewater, which in the opinion of the Superintendent can cause harm either to the sewers, sewage treatment process, or equipment; have an adverse effect on the receiving stream; or can otherwise endanger life, limb, public property, or constitute a nuisance, unless allowed under special agreement by the Superintendent (except that no special waiver shall be given from categorical pretreatment standards); or
21. Wastewater containing substances not amenable to treatment or reduction by the sewage treatment processes employed, or are amenable to treatment only to such a degree that the sewage treatment plant effluent cannot meet the requirements of other agencies having jurisdiction over discharges to the receiving waters; or
22. The contents of any tank or other vessel owned or used by any person in the business of collecting or pumping sewage, effluent, septage, or other wastewater unless said person has first obtained testing and approval as may be generally required by the City and paid all fees assessed for the privilege of said discharge; or
23. Persistent pesticides and/or pesticides regulated by the Federal Insecticide Fungicide Rodenticide Act (FIFRA); or
24. Any hazardous wastes as defined in rules published by the State of Idaho or in 40 CFR part 261; or
25. Discharge of polychlorinated biphenyls (PCBs) in excess of 0.003 mg/l or any concentration of PCBs or 2,3,7,8-TCDD that causes pass through or interference; or
26. Wastewater containing fats, oils or grease (FOG) that causes or contributes to pass through, interference or otherwise causes the City to clean the collection system more frequently; or
27. Wastewater which contains grease or oil or any other substances that will solidify or become discernibly viscous at temperatures between thirty two degrees Fahrenheit (32°F) (0° Celsius) and one hundred fifty degrees Fahrenheit (150°F) (65.5° Celsius); or
28. Wastewater containing free or floating oil and grease, or any discharge containing animal fat or grease by-product in excess of one hundred fifty milligrams per liter (150 mg/l). This limit will not apply if the industrial user has installed and is properly operating and maintaining a gravity grease interceptor and implementing all required BMPs; or
29. Wastewater generated as a result of wastes pumped from gravity grease interceptors, hydromechanical grease interceptors or grease traps, sand-oil separators or other storage tanks or treatment units back into the POTW, either directly or indirectly, without approval of the City.
Pollutants, substances, or wastewater prohibited by this section may not be processed or stored in a manner that they could be discharged to the POTW. (Ord. 3655 §25, 2020: Ord. 3558, 2017: Ord. 3374 §2, 2010)