(A) General Prohibitions: No user shall 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 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 flash point of less than 140ºF (60ºC) using the test methods specified in 40 CFR 261.21;
2. Wastewater having a pH less than 5.0 or greater than 9.5, 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 [but in no case solids greater than ½ inch (½") or 0.7 centimeter(s) (0.7cm) in any dimension];
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;
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 104ºF (40ºC) unless the approval authority, upon the request of the POTW, approves alternate temperature limits;
6. Petroleum oil, non-biodegradable cutting oil, or products of mineral oil origin, in amounts that will cause interference or pass through;
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;
8. Trucked or hauled pollutants, except at discharge points designated by the City.
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 health, or to prevent entry into the sewers for maintenance or repair;
10. Wastewater containing any radioactive wastes or isotopes except as specifically approved by the City in compliance with applicable State or Federal regulations;
11. Storm water, surface water, ground water, artesian well water, roof runoff, subsurface drainage, swimming pool drainage, condensate, de-ionized water, non-contact cooling water, and unpolluted wastewater, unless specifically authorized;
12. Any sludges, screenings, or other residues from the pretreatment of industrial wastes or from industrial processes;
13. Medical wastes, except as specifically authorized by the City;
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 POTW;
16. 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.
17. 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, waste paper, wood, plastics, gas, tar asphalt residues, residues from refining or processing of fuel or lubricating oil, mud, or glass grinding or polishing wastes.
18. Any substance which will cause the POTW to violate its IPDES permit and/or other disposal system permits.
19. Any wastewater, which in the opinion of the City 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 waived by the City (except that no waiver shall be given from categorical pretreatment standards).
20. The contents of any tank or other vessel owned or used by any person in the business of collecting or pumping sewage, effluent, septic tank waste, or other wastewater unless said person has first obtained testing and approval as may be generally required by the City of Twin Falls and has paid all fees assessed for the privilege of said discharge.
21. Persistent pesticides and/or pesticides regulated by the Federal Insecticide Fungicide Rodenticide Act (FIFRA)
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.
(Ord. 2020-018, 10-19-2020)