Chemical Waste Registry Searchable Database

This registry contains the most common chemicals collected by the Department of Environmental Health and Safety (approximately 99% of all chemicals used by the University). It provides the chemical information you need to safely handle your hazardous chemical waste and complete the waste packing form.

See the Chemical Waste Registry chemical information below for an explanation of what the table fields mean.

Drum Designator Code (DDC)

The DDC is an internal system developed by the Regulated Waste Program for classifying hazardous substances through the use of a two-part designation code. The first two digits of the DDC relate to the Department of Transportation (DOT) code and designate the chemical's primary hazard. The second part of the DDC consists of two letters which further describe the chemical/physical characteristics of the substance or defines the type of disposal or treatment methodology required.

Hazard Class Codes (First Two Digits of DDC)


Hazard Class

01 Corrosive bases
02 Corrosive acids
05 ORM-E (Other Regulated Materials-E)
06 Combustible materials
07 Flammable gases
08 Flammable liquids
09 Flammable solids
11 Non-flammable gases
12 Organic peroxides
14 Explosives
16 Oxidizers
18 Poisons

Disposal Type Codes (Second Two Digits of DDC)


Chemical Type


Chemical Type

AS Arsenic OX Oxidizer
BS Bulk solvent PF Peroxide former
CC Flammable caustic PH Inhalation hazard
CG Compressed gas PL  Pyrophoric liquid
CN Cyanide PO Pourable oil
DX Dioxin containing PS Pyrophoric solid
EX Explosive PW Pyrophoric Water Reactive
FA Flammable acid PX PCB contaminated
FL Flammable  RA Radioactive
FS Flammable solid SC Spontaneously Combustible
HG Mercury SI  Solid inorganic
HF Hydrofluoric acid  SO Solid organic
HM Heavy Metal SR Self-reactive solid
LI Liquid inorganic STOS Asbestos
LO Liquid organic TC Temperature controlled
NA Nitric acid WF Water-reactive flammable liquid
NH Nonhazardous WS Water reactive

Chemical Abstract Service (CAS) Number 

The CAS number is a systematic number assigned to the chemical compound. Include this number on the waste packing form.

Environmental Protection Agency (EPA) Number

The EPA number designated the primary hazard of a chemical according to the following guidelines:

EPA Number

Hazard of Chemical

D001 Ignitables — flammable liquids and oxidants
D002 Corrosives — acids and bases
D003 Reactives — water and shock sensitive compounds
D004–D043 Toxic material — heavy metals, pesticides, organic solvents
Pxxx Acutely hazardous wastes
Uxxx Toxic hazardous wastes
MN01 Toxic materials not specified by the above (MN lethality waste code)