Wastewater

Liquid wastes entering indoor drains at the University of Oregon flow through an underground pipe system to the City of Eugene wastewater treatment plant, where wastewater is cleaned before being discharged to the Willamette River. Wastewater from labs and research facilities has the potential to contain hazardous wastes, toxic chemicals, and volatile organic compounds. To prevent disruptions to treatment plant operations, as well as pollution to the Willamette River, the university is required to implement best management practices related to wastewater discharges. Failure to follow these requirements may result in a citation from the City of Eugene. 

Can be Poured Down Interior Drains

  • Most simple sugar and salts solutions may be drain disposed if in pH range of 6-9.
  • Biological and microbial liquid cultures only after being inactivated via bleach, autoclave, or other EHS approved methods.
  • Water with temperatures ≤150°F only.

Individual labs must have prior authorization from EHS for pH neutralization (target pH range 6-9) prior to drain disposal. Small quantities of acids or bases, where pH is the only hazard characteristic can be neutralized and drain disposed. 

Labs must also maintain pH neutralization records. Records must include:

  • Date the sample analysis was performed
  • Individual performing the analysis
  • Analytical methods used (how pH was determined)
  • Results of analysis
  • Volume of treated waste discharged to the wastewater collection system

Cannot be Poured Down Interior Drains

  • Corrosive Liquids - Strong acids or bases
  • Hazardous Materials and Wastes including:
    • Explosive, flammable, reactive, toxic or carcinogenic substances
    • Radioactive waste
    • Untreated bio-hazardous waste
  • Solutions With Heavy Metals Concentrations Above Local Discharge Limits. EHS can assist with waste determinations and arranging for testing of metal concentrations.
  • Solid or Viscous Substances including:
    • Spent grains
    • Clay
    • Grinding/polishing wastes
    • Metal
    • Animal tissues
    • Paper
    • Wood
    • Plastics
    • Oil
    • Grease
  • Very Hot Water - >150°F
  • Solutions that are otherwise prohibited by City of Eugene Code including:
    • Foul Odors
    • Dyes
    • Medical Wastes
    • Unused Pharmaceuticals

If there is an unintentional discharge of the above materials, contact EHS at 541-346-3192 as soon as possible. Provide the name of the material, an estimate of the amount, and the time of the discharge. 

Contact the EHS Hazardous Materials Group if you have questions or for assistance in determining what materials in your lab may be disposed down the drain.