Even if a chemical is not a “hazardous waste” by the USEPA definition or listing, the town and city wastewater discharge permits for the North and South Campuses, respectively, do not allow hazardous chemicals down the sink or other drains.
The ONLY aqueous solutions in normal laboratory volumes (<1 gallon) that may be drain disposed must have a pH between 5 and 9 and DO NOT CONTAIN:
UNDILUTED DISINFECTANTS OR STERILANTS MAY NOT BE POURED DOWN THE DRAIN. Containerize for proper disposal
Note: Gels (agar, electrophoresis plates, gelatin) that contain hazardous substances of biological, chemical or radiological nature must be containerized and disposed of as hazardous waste. If they do not contain hazardous substances, they do not need to be containerized, but they should not be disposed of through the drain system. They could clog and stop the drain. In addition they can provide a coating on the pipes that will allow bacterial growth and subsequent colonization of “drain flies” that are very difficult to eradicate.
If you have further questions or are requesting special approval for drain disposal, please contact EH&S at 829-3301.