If the chemical in question is not already on the "Chemicals Approved for Drain Disposal​" list, the NIH will need to determine if it is acceptable for disposal. 

• ​Approved Chemicals: Chemical wastes that are already listed on the "Chemicals Approved for Drain Disposal​" list are approved for disposal down the drain when not mixed with unapproved materials. 
• Unlisted Chemicals: If a chemical waste that is generated in your lab does not appear on the list, you may request standing approval for drain disposal using the Application for Disposal of Specific Chemical Reagents to the Sanitary Sewer​.​
• Special Cases: System wastes, disinfection wastes, or chemicals associated with disapproved mixtures will be approved on a case-by-case basis. 
• ​If approved, the chemical will be added by DEP to the list of "Chemicals Approved for Drain Disposal​". 
• If disapproved, collect the material as chemical waste and request pickup through your waste disposal authority.

​​​​Figure 1: Chemical Waste Disposal Procedure​
Figure 2: Unacceptable​ Chemical Waste for Drain Disposal by Chemical Waste Characteristics and EPA codes