West Knox Utility District


Customer Discharge Standards to the Sewer System

No industrial 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 industrial 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. Furthermore, no industrial user may contribute the following substances to the POTW:

  1. Pollutants which create a fire or explosive hazard to the municipal wastewater collection and POTW, including but not limited to, wastestreams with a closed- cup flashpoint of less than 140 degrees F (60 degrees C) using the test methods specified in 40 CFR 261.21.
  2. Any wastewater having a pH less than 5.0 or more than 9.0, or otherwise causing corrosive structural damage to the POTW or equipment, or endangering District personnel.
  3. Solids 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 (1/2") inch.
  4. Any wastewater containing pollutants, including oxygen-demanding pollutants (BOD, etc.), released in a discharge at a flow rate and/or pollutant concentration which, either singularly or by interaction with other pollutants, will cause interference with either the POTW or any wastewater treatment or sludge process, or which will constitute a hazard to humans or animals.
  5. Any wastewater having a temperature greater than 110 degrees F, or 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 104 degrees F (40 degrees C).
  6. Petroleum oil, non biodegradable cutting oil, or products of mineral oil origin, in amounts that will cause interference or pass through.
  7. Any 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. Any trucked or hauled pollutants, except at discharge points designated by the District.
  9. Any noxious or malodorous liquids, gases, solids, or other wastewater which, either singularly or by interaction with other wastes, are sufficient to create a public nuisance, a hazard to life or to prevent entry into the sewers for maintenance and repair.
  10. Any 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 District's NPDES 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 10 percent from the seasonably established norm for aquatic life.
  11. Any wastewater containing any radioactive wastes or isotopes except as specifically approved by the General Manager in compliance with applicable State or Federal regulations.
  12. Storm water, surface water, ground water, artesian well water, roof run off, subsurface drainage, swimming pool drainage, condensate, deionizes water, noncontact cooling water, and unpolluted industrial wastewater, unless specifically authorized by the General Manager.
  13. Any sludges, screenings, or other residues from the pretreatment of industrial wastes.
  14. Any medical wastes, except as specifically authorized by the General Manager in a wastewater discharge permit.
  15. Any wastewater causing the treatment plant's effluent to fail a toxicity test.
  16. Any wastes containing detergents, surface active agents, or other substances which may cause excessive foaming in the POTW.
  17. Any discharge of fats, oils, or greases of animal or vegetable origin is limited to 100 mg/l.

Wastes prohibited by this section shall not be processed or stored in such a manner that they could be discharged to the POTW. All floor drains located in the process or materials storage areas must discharge to the industrial user's pretreatment facility before connecting with the POTW.