California Code of Regulations
Title 22 - Social Security
Division 4.5 - Environmental Health Standards for the Management of Hazardous Waste
Chapter 11 - Identification and Listing of Hazardous Waste
Appendix XII - California Hazardous Waste Codes

Universal Citation: 22 CA Code of Regs XII

Current through Register 2024 Notice Reg. No. 38, September 20, 2024

(a) Subdivisions (b) and (c) of this appendix establish the California Hazardous Waste Code Numbers assigned to wastes which have been identified as hazardous wastes pursuant to the characteristics of hazardous waste as set forth in article 3 of this chapter or pursuant to the lists of hazardous wastes in article 4 of this chapter. These Waste Code Numbers shall be used in complying with the notification requirements of Health and Safety Code section 25153.6 and, where applicable, in the recordkeeping and reporting requirements under chapters 12 through 15, 18, and 20 of this division.

(1) In cases where hazardous wastes may have both an EPA Hazardous Waste Number and a California Hazardous Waste Code Number, both numbers shall be used in complying with the notification requirements of Health and Safety Code section 25153.6 and the recordkeeping and reporting requirements under chapters 12 through 15, 18, and 20 of this division.

(2) If both a California Hazardous Waste Code from the "California Restricted Wastes" category and a code from another category of California Hazardous Waste Codes apply to a specific hazardous waste, the code from the "California Restricted Wastes" category shall be used.

(b) List of California Hazardous Waste Codes arranged in numerical order:

Waste Code Number

Waste Description
(1) Inorganics:
121Alkaline solution (pH [LESS THAN EQUAL TO] 12.5) with metals (antimony, arsenic, barium, beryllium, cadmium, chromium, cobalt, copper, lead, mercury, molybdenum, nickel, selenium, silver, thallium, vanadium, and zinc)
122Alkaline solution without metals (pH > 12.5)
123Unspecified alkaline solution
131Aqueous solution (2 < pH < 12.5) containing reactive anions (azide, bromate, chlorate, cyanide, fluoride, hypochlorite, nitrite, perchlorate, and sulfide anions)
132Aqueous solution with metals (restricted levels and see waste code 121 for a list of metals)
133Aqueous solution with 10% or more total organic residues
134Aqueous solution with less than 10% total organic residues
135Unspecified aqueous solution
141Off-specification, aged, or surplus inorganics
151Asbestos-containing waste
161Fluid-cracking catalyst (FCC) waste
162Other spent catalyst
171Metal sludge (see 121)
172Metal dust (see 121) and machining waste
181Other inorganic solid waste
(2) Organics:
211Halogenated solvents (chloroform, methyl chloride, perchloroethylene, etc.)
212Oxygenated solvents (acetone, butanol, ethyl acetate, etc.)
213Hydrocarbon solvents (benzene, hexane, Stoddard, etc.)
214Unspecified solvent mixture
221Waste oil and mixed oil
222Oil/water separation sludge
223Unspecified oil-containing waste
231Pesticide rinse water
232Pesticides and other waste associated with pesticide production
241Tank bottom waste
251Still bottoms with halogenated organics
252Other still bottom waste
261Polychlorinated biphenyls and material containing PCB's
271Organic monomer waste (includes unreacted resins)
272Polymeric resin waste
281Adhesives
291Latex waste
311Pharmaceutical waste
321Sewage sludge
322Biological waste other than sewage sludge
331Off-specification, aged, or surplus organics
341Organic liquids (nonsolvents) with halogens
342Organic liquids with metals (see 121)
343Unspecified organic liquid mixture
351Organic solids with halogens
352Other organic solids
(3) Sludges:
411Alum and gypsum sludge
421Lime sludge
431Phosphate sludge
441Sulfur sludge
451Degreasing sludge
461Paint sludge
471Paper sludge/pulp
481Tetraethyl lead sludge
491Unspecified sludge waste
(4) Miscellaneous:
511Empty pesticide containers 30 gallons or more
512Other empty containers 30 gallons or more
513Empty containers less than 30 gallons
521Drilling mud
531Chemical toilet waste
541Photochemicals/photoprocessing waste
551Laboratory waste chemicals
561Detergent and soap
571Fly ash, bottom ash, and retort ash
581Gas scrubber waste
591Baghouse waste
611Contaminated soil from site clean-ups
612Household waste
613Auto shredder waste
614Treated wood waste
(5) California Restricted Wastes:
711Liquids with cyanides >= 1000 mg/l
721Liquids with arsenic >= 500 mg/l
722Liquids with cadmium >= 100 mg/l
723Liquids with chromium (VI) >= 500 mg/l
724Liquids with lead >= 500 mg/l
725Liquids with mercury >= 20 mg/l
726Liquids with nickel >= 134 mg/l
727Liquids with selenium >= 100 mg/l
728Liquids with thallium >= 130 mg/l
731Liquids with polychlorinated biphenyls >= 50 mg/l
741Liquids with halogenated organic compounds >= 1000 mg/l
751Solids or sludges with halogenated organic compounds >= 1000mg/kg
791Liquids with pH [LESS THAN EQUAL TO] 2
792Liquids with pH [LESS THAN EQUAL TO] 2 with metals
801Waste potentially containing dioxins

(c) List of California Hazardous Waste Codes arranged alphabetically within each numbered category in this subdivision:

Waste Code NumberWaste Description
(1) Inorganics:
121Alkaline solution (pH >= 12.5) with metals (antimony, arsenic, barium, beryllium, cadmium, chromium, cobalt, copper, lead, mercury, molybdenum, nickel, selenium, silver, thallium, vanadium, and zinc)
122Alkaline solution without metals (pH >= 12.5)
131Aqueous solution (2 < pH < 12.5) containing reactive anions (azide, bromate, chlorate, cyanide, fluoride, hypochlorite, nitrite, perchlorate, and sulfide anions)
133Aqueous solution with 10% or more total organic residues
134Aqueous solution with less than 10% total organic residues
132Aqueous solution with metals (restricted levels and see waste code 121 for a list of metals)
151Asbestos-containing waste
161Fluid-cracking catalyst (FCC) waste
172Metal dust (see 121) and machining waste
171Metal sludge (see 121)
141Off-specification, aged, or surplus inorganics
181Other inorganic solid waste
162Other spent catalyst
123Unspecified alkaline solution
135Unspecified aqueous solution
(2) Organics:
281Adhesives
322Biological waste other than sewage sludge
211Halogenated solvents (chloroform, methyl chloride, perchloroethylene, etc.)
213Hydrocarbon solvents (benzene, hexane, Stoddard, etc.)
291Latex waste
331Off-specification, aged, or surplus organics
222Oil/water separation sludge
341Organic liquids (nonsolvents) with halogens
342Organic liquids with metals (see 121)
271Organic monomer waste (includes unreacted resins)
351Organic solids with halogens
352Other organic solids
252Other still bottom waste
212Oxygenated solvents (acetone, butanol, ethyl acetate, etc.)
231Pesticide rinse water
232Pesticides and other waste associated with pesticide production
311Pharmaceutical waste
261Polychlorianted biphenyls and material containing PCBs
272Polymeric resin waste
321Sewage sludge
251Still bottoms with halogenated organics
241Tank bottom waste
223Unspecified oil-containing waste
343Unspecified organic liquid mixture
214Unspecified solvent mixture
221Waste oil and mixed oil
(3) Sludges:
411Alum and gypsum sludge
451Degreasing sludge
421Lime sludge
461Paint sludge
471Paper sludge/pulp
431Phosphate sludge
441Sulfur sludge
481Tetraethyl lead sludge
491Unspecified sludge waste
(4) Miscellaneous:
613Auto shredder waste
591Baghouse waste
531Chemical toilet waste
611Contaminated soil from site clean-ups
561Detergent and soap
521Drilling mud
513Empty containers less than 30 gallons
511Empty pesticide containers 30 gallons or more
571Fly ash, bottom ash, ad retort ash
581Gas scrubber waste
612Household waste
551Laboratory waste chemicals
512Other empty containers 30 gallons or more
541Photochemical/photoprocessing waste
614Treated wood waste
(5) California Restricted Wastes:
721Liquids with arsenic >= 500 mg/l
722Liquids with cadmium >= 100 mg/l
723Liquids with chromium (VI) >= 500 mg/l)
711Liquids with cyanides >= 1000 mg/l
741Liquids with halogenated organic compounds >= 1000 mg/l
724Liquids with lead >= 500 mg/l
725Liquids with mercury >= 20 mg/l
726Liquids with nickel >= 134 mg/l
791Liquids with pH [LESS THAN EQUAL TO] 2
792Liquids with pH [LESS THAN EQUAL TO] 2 with metals
731Liquids with polychlorinated biphenyls >= 50 mg/l
727Liquids with selenium >= 100 mg/l
728Liquids with thallium >= 130 mg/l
751Solids or sludges with halogenated organic compounds >= 1000 mg/l
801Waste potentially containing dioxins

1. New section filed 5-24-91; effective 7-1-91 (Register 91, No. 22).
2. Amendment of subsections (b)(4) and (c)(4) and NOTE filed 6-18-2007; operative 7-1-2007 pursuant to Government Code section 11343.4 (Register 2007, No. 25).

Note: Authority cited: Sections 25150 and 58012, Health and Safety Code. Reference: Sections 25117.9, 25122.7, and 25150, Health and Safety Code.

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