1. Pollutants that create a fire or explosive hazard, including, but not limited to, wastestreams with a closed-cup flash point of less than 140 degrees Fahrenheit (60 degrees Celsius) using the test methods specified in 40 CFR 261.21.

2. Wastewater having a pH less than 6.0 or more than 10.0, or otherwise causing corrosive structural damage to the sewage system or equipment.

3. Solid or viscous substances in amounts which will cause obstruction of the flow in or to the sewage system resulting in interference (but in no case solids greater than one-half inch or one and one-quarter centimeters in any dimension).

4. Pollutants, including oxygen-demanding pollutants (BOD, COD, etc.), released in a discharge at a flow rate and/or pollutant concentration that, either singly or by interaction with other pollutants, will cause interference with the sewage system.

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 77 degrees Fahrenheit (25 degrees Celsius) unless the DEQ, upon the request of the City, approves alternate temperature limits not to exceed 125 degrees.

6. Petroleum oil, nonbiodegradable cutting oil, products of mineral oil origin, or synthetic oils in amounts that will cause interference or pass through.

7. Pollutants which result in the presence of toxic gases, vapors, or fumes within the sewage system 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 that imparts color that cannot be removed by the treatment process, such as, but not limited to, dye wastes and vegetable tanning solutions that impart color to the treatment plant’s effluent. 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 10 percent from the seasonably established norm for aquatic life.

11. Wastewater containing any radioactive wastes or isotopes.

12. 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 in writing by the City.

13. Any sludges, screenings, or other residues from the pretreatment of industrial wastes or from industrial processes.

14. Medical wastes, except as specifically authorized by the City.

15. Wastewater causing, alone or in conjunction with other sources, the treatment plant’s effluent to fail a toxicity test.

16. Detergents, surface-active agents, or other substances that may cause excessive foaming in the sewage system.

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 sewage system or to the operation of the sewage system. At no time shall two 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 nor any single reading over 10 percent of the lower explosive limit (LEL) of the meter.

18. Grease, animal renderings 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, gasoline, tar asphalt residues, petroleum products, residues from refining or processing of fuel or lubricating oil, mud, glass grinding or polishing wastes.

19. Any substance which will cause the City to violate its WPCF and/or other disposal or discharge permits or system permits.

20. 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 groundwater or receiving waters; or can otherwise endanger life, limb, public property, or constitute a nuisance.

21. The contents of any tank or other vessel owned or used in the business of collecting or pumping sewage, effluent, septic tank waste, or other wastewater unless the operator has obtained testing and approval by the City and paid all fees assessed for the privilege of the discharge.

22. Any hazardous wastes as defined in State regulations or in 40 CFR Part 261.

23. Persistent pesticides and/or pesticides regulated by the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA).

24. Sewage sludge, except in accordance with the City’s WPCF permit.

Pollutants, substances, or wastewater prohibited by this chapter shall not be processed or stored in such a manner that they could be discharged to the sewage system. [Ord. NS-2182, 2012]