Hazardous Waste Determination

Hazardous Waste Classification

Waste is considered regulated hazardous waste if it meets any of the following:

Characteristic Waste

Waste is regulated as hazardous if it meets any of the following characteristics.

Hazardous: Ignitable

  • A liquid with a flash point less than 60 degrees Centigrade
  • A solid capable under normal conditions of causing fire through friction, absorption of moisture or spontaneous chemical changes
  • A flammable compressed gas
  • An oxidizer

Hazardous: Corrosive

  • An aqueous with pH less than or equal to 2, or greater than or equal to 12.5
  • A liquid that corrodes steel at a rate greater than 0.250 inches per year at 55 degrees Centigrade

Hazardous: Reactive

  • Is unstable and readily undergoes violent change without detonating
  • Reacts violently with water
  • Forms potentially explosive mixtures with water
  • Upon mixture with water generates toxic gases, vapors or fumes
  • Generates toxic gases, vapors or fumes at pH conditions between 2 and 12.5
  • Capable of detonation or explosive decomposition
  • Classified as a Department of Transportation explosive

Hazardous: Toxicity Characteristic

  • The waste contains certain metals, pesticides or selected organics above specified levels.  See List of Toxic Characteristic Wastes.
  • if it is otherwise capable of causing environmental or health damage if improperly disposed (this judgment is based on knowledge of the material).


Footnote:  K-list waste codes are industry specific and don't apply to university waste operations


Chris Niles
Sr. Laboratory Safety Specialist

Stanley Howell
Sr. Program Manager
Chemical Safety 

Joan Hutzly
Laboratory Safety Specialist