RCRA waste codes Find a federal code by waste, process, chemical or number.
- Free, no account
- Based on 40 CFR Part 261 and EPA guidance
- Nothing is stored
Find a federal hazardous waste code
Pick a waste or type one, and its RCRA codes show here.
What do the code letters mean?
| Codes | What they identify |
|---|---|
| D001–D043 | Ignitability, corrosivity, reactivity or toxicity |
| F codes | Wastes from named processes used across industries |
| K codes | Named wastes from named industries |
| P and U codes | Qualifying unused commercial chemical products |
One waste can have several federal codes.
How do I make a waste determination?
- Identify the waste where it is generated, before mixing or treatment.
- Match any F or K process listing and any P or U unused-product listing.
- Check all four hazardous characteristics.
- Record the evidence for every code assigned.
What should I check before shipping?
Exclusions, containers, generator limits and manifests.
State code guides: California, Texas, Washington, Oregon.
All 562 federal hazardous waste codes
Characteristic codes, then the F, K, P and U lists, as 40 CFR Part 261 sets them out. Each code links to its page.
Characteristic hazardous waste 43 codes
Characteristic hazardous waste: what each code covers
- D001 Ignitable waste
- D002 Corrosive waste
- D003 Reactive waste
- D004 Arsenic
- D005 Barium
- D006 Cadmium
- D007 Chromium
- D008 Lead
- D009 Mercury
- D010 Selenium
- D011 Silver
- D012 Endrin
- D013 Lindane
- D014 Methoxychlor
- D015 Toxaphene
- D016 2,4-D
- D017 2,4,5-TP (Silvex)
- D018 Benzene
- D019 Carbon tetrachloride
- D020 Chlordane
- D021 Chlorobenzene
- D022 Chloroform
- D023 o-Cresol
- D024 m-Cresol
- D025 p-Cresol
- D026 Cresol
- D027 1,4-Dichlorobenzene
- D028 1,2-Dichloroethane
- D029 1,1-Dichloroethylene
- D030 2,4-Dinitrotoluene
- D031 Heptachlor (and its epoxide)
- D032 Hexachlorobenzene
- D033 Hexachlorobutadiene
- D034 Hexachloroethane
- D035 Methyl ethyl ketone
- D036 Nitrobenzene
- D037 Pentachlorophenol
- D038 Pyridine
- D039 Tetrachloroethylene
- D040 Trichloroethylene
- D041 2,4,5-Trichlorophenol
- D042 2,4,6-Trichlorophenol
- D043 Vinyl chloride
F-listed waste 28 codes
F-listed waste: what each code covers
- F001 Spent halogenated solvents used for degreasing
- F002 Spent halogenated solvents
- F003 Spent non-halogenated solvents: acetone, xylene and related solvents
- F004 Spent cresol, cresylic acid and nitrobenzene solvents
- F005 Spent toluene, methyl ethyl ketone (MEK) and related solvents
- F006 Wastewater sludge from electroplating
- F007 Spent cyanide plating-bath solution
- F008 Bottom residue from cyanide plating baths
- F009 Spent cyanide baths used to strip or clean plated metal
- F010 Residue from cyanide oil-quench baths used in metal heat treating
- F011 Spent cyanide solution from cleaning heat-treatment salt pots
- F012 Wastewater sludge from cyanide metal-quench baths
- F019 Wastewater sludge from aluminum conversion coating
- F020 Waste from making or manufacturing use of tri- or tetrachlorophenol
- F021 Waste from making or manufacturing use of pentachlorophenol
- F022 Waste from using chlorobenzenes under alkaline conditions
- F023 Waste from equipment formerly used for chlorophenols
- F024 Process residues from making certain chlorinated hydrocarbons
- F025 Filters, drying agents and light residues from chlorinated hydrocarbons
- F026 Waste from equipment formerly used with alkaline chlorobenzenes
- F027 Unused chlorophenol formulations
- F028 Residue from heat-treating soil contaminated with listed dioxin waste
- F032 Waste from wood preserving with chlorophenol products
- F034 Waste from wood preserving with creosote
- F035 Waste from wood preserving with arsenic or chromium
- F037 Primary oil, water and solids separator sludge from a refinery
- F038 Secondary emulsified oil, water and solids sludge from a refinery
- F039 Leachate from more than one restricted listed hazardous waste
K-listed waste 121 codes
K-listed waste: what each code covers
- K001 Bottom sludge from treating wood-preserving wastewater
- K002 Wastewater sludge from making chrome yellow or orange pigment
- K003 Wastewater sludge from making molybdate orange pigment
- K004 Wastewater sludge from making zinc yellow pigment
- K005 Wastewater sludge from making chrome green pigment
- K006 Wastewater sludge from making chrome oxide green pigment
- K007 Wastewater sludge from making iron blue pigment
- K008 Oven residue from making chrome oxide green pigment
- K009 Bottom distillation residue from making acetaldehyde
- K010 Side fractions from distilling acetaldehyde
- K011 Wastewater-stripper bottom liquid from making acrylonitrile
- K013 Acetonitrile-column bottom liquid from making acrylonitrile
- K014 Acetonitrile purification residue from making acrylonitrile
- K015 Bottom distillation residue from benzyl chloride
- K016 Heavy distillation residue from making carbon tetrachloride
- K017 Heavy purification residue from making epichlorohydrin
- K018 Heavy fraction from making ethyl chloride
- K019 Heavy distillation residue from making ethylene dichloride
- K020 Heavy distillation residue from making vinyl chloride
- K021 Spent antimony catalyst liquid from making fluoromethanes
- K022 Distillation tar from making phenol and acetone
- K023 Light distillation fractions from making phthalic anhydride from naphthalene
- K024 Bottom residue from making phthalic anhydride from naphthalene
- K025 Bottom distillation residue from making nitrobenzene
- K026 Bottom stripping-still residue from making methyl ethyl pyridines
- K027 Centrifuge and distillation residue from making toluene diisocyanate
- K028 Spent reactor catalyst from making 1,1,1-trichloroethane
- K029 Steam-stripper waste from making 1,1,1-trichloroethane
- K030 Column residue from making trichloroethylene and perchloroethylene
- K031 By-product salts from making the herbicides MSMA and cacodylic acid
- K032 Wastewater sludge from making the insecticide chlordane
- K033 Chlorination wastewater and scrub water from making chlordane insecticide
- K034 Filter solids from making the insecticide chlordane
- K035 Wastewater sludge from making creosote
- K036 Toluene-recovery residue from making the insecticide disulfoton
- K037 Wastewater sludge from making the insecticide disulfoton
- K038 Wash and stripping water from making the insecticide phorate
- K039 Filter cake from making the insecticide phorate
- K040 Wastewater sludge from making the insecticide phorate
- K041 Wastewater sludge from making the insecticide toxaphene
- K042 Residues from making the herbicide 2,4,5-T
- K043 2,6-dichlorophenol waste from making the herbicide 2,4-D
- K044 Wastewater sludge from making or processing explosives
- K045 Spent carbon from treating explosives wastewater
- K046 Wastewater sludge from making or loading lead-based explosive initiators
- K047 Pink or red wastewater from TNT operations
- K048 Float from dissolved-air flotation at a petroleum refinery
- K049 Slop-oil emulsion solids from a petroleum refinery
- K050 Refinery heat-exchanger cleaning sludge
- K051 API oil-water separator sludge from petroleum refining
- K052 Leaded tank-bottom residue from a petroleum refinery
- K060 Lime sludge from a coke-plant ammonia still
- K061 Electric-furnace dust or sludge from primary steelmaking
- K062 Spent acid pickling liquor from iron or steel finishing
- K069 Air-pollution-control dust or sludge from secondary lead smelting
- K071 Brine-purification mud from mercury-cell chlorine production
- K073 Chlorinated hydrocarbon waste from graphite-anode chlorine production
- K083 Bottom distillation residue from making aniline
- K084 Wastewater sludge from making arsenic-based veterinary drugs
- K085 Bottom distillation residue from making chlorobenzenes
- K086 Cleaning waste from making ink with chromium and lead
- K087 Tar sludge from a coke-plant decanter tank
- K088 Spent lining from pots used to make primary aluminum
- K093 Light distillation fractions from making phthalic anhydride from ortho-xylene
- K094 Bottom residue from making phthalic anhydride from ortho-xylene
- K095 Bottom distillation residue from making 1,1,1-trichloroethane
- K096 Heavy distillation residue from making 1,1,1-trichloroethane
- K097 Vacuum-stripper discharge from making the insecticide chlordane
- K098 Untreated wastewater from making the insecticide toxaphene
- K099 Untreated wastewater from making the herbicide 2,4-D
- K100 Acid solution used to leach secondary lead-smelting dust
- K101 Distillation tar from making arsenic-based veterinary drugs
- K102 Spent activated carbon from making arsenic-based veterinary drugs
- K103 Extraction residue from making aniline
- K104 Combined wastewater from making nitrobenzene and aniline
- K105 Separated reactor-wash water from making chlorobenzenes
- K106 Wastewater sludge from mercury-cell chlorine production
- K107 Product-separation residue from making rocket-fuel chemical UDMH
- K108 Condensed vapors from making rocket-fuel chemical UDMH
- K109 Spent purification filters from making rocket-fuel chemical UDMH
- K110 Condensed intermediate-separation vapors from making UDMH
- K111 Product washwater from making dinitrotoluene
- K112 Drying-column water from making toluenediamine
- K113 Condensed light fractions from purifying toluenediamine
- K114 Ortho-isomer residue from purifying toluenediamine
- K115 Heavy residue from purifying toluenediamine
- K116 Solvent-recovery condensate from making toluene diisocyanate
- K117 Reactor-vent scrubber water from making ethylene dibromide
- K118 Spent adsorbent from purifying ethylene dibromide
- K123 Process water from making a dithiocarbamate pesticide ingredient
- K124 Reactor scrubber water from making a dithiocarbamate pesticide ingredient
- K125 Production solids from a dithiocarbamate pesticide ingredient
- K126 Dust and floor sweepings from making or formulating dithiocarbamate pesticides
- K131 Reactor water and spent acid from making methyl bromide fumigant
- K132 Spent absorbent and separator solids from making methyl bromide fumigant
- K136 Bottom purification residue from making ethylene dibromide
- K141 Process residue from recovering coal tar
- K142 Tar-tank residue from making coke or recovering coke by-products
- K143 Light-oil recovery residue from coke by-products
- K144 Sump residue from refining light oil from coke by-products
- K145 Naphthalene recovery residue from coke by-products
- K147 Tar-tank residue from refining coal tar
- K148 Distillation residue from coal tar
- K149 Bottom distillation residue from chlorinated toluenes or benzoyl chlorides
- K150 Recovery residue from chlorinated toluene or benzoyl chloride production
- K151 Wastewater sludge from chlorinated toluene or benzoyl chloride production
- K156 Organic waste from making carbamates or carbamoyl oximes
- K157 Wastewater from making carbamates or carbamoyl oximes
- K158 Dust and solids from making carbamates or carbamoyl oximes
- K159 Organic residue from treating thiocarbamate waste
- K161 Solids, dust and sweepings from making dithiocarbamate acids or salts
- K169 Crude-oil storage-tank sediment from a petroleum refinery
- K170 Slurry-oil tank sediment and filter solids from a petroleum refinery
- K171 Spent hydrotreating catalyst from a petroleum refinery
- K172 Spent hydrorefining catalyst from a petroleum refinery
- K174 Wastewater sludge from making ethylene dichloride or vinyl chloride
- K175 Wastewater sludge from acetylene-based vinyl chloride production
- K176 Baghouse filters from making antimony oxide
- K177 Discarded or speculatively accumulated slag from making antimony oxide
- K178 Ferric chloride manufacturing or storage residue from titanium dioxide production
- K181 Non-wastewater dye or pigment waste meeting annual mass-loading limits
P-listed waste 124 codes
P-listed waste: what each code covers
- P001 Warfarin and salts — an anticoagulant medicine and rodenticide
- P002 1-Acetyl-2-thiourea
- P003 Acrolein
- P004 Aldrin — an insecticide
- P005 Allyl alcohol
- P006 Aluminum phosphide
- P007 5-(Aminomethyl)-3-isoxazolol
- P008 4-Aminopyridine
- P009 Ammonium picrate — an explosive compound
- P010 Arsenic acid H3 AsO4
- P011 Arsenic pentoxide
- P012 Arsenic trioxide
- P013 Barium cyanide
- P014 Thiophenol
- P015 Beryllium powder
- P016 Dichloromethyl ether
- P017 Bromoacetone
- P018 Brucine
- P020 Dinoseb — a herbicide
- P021 Calcium cyanide
- P022 Carbon disulfide
- P023 Chloroacetaldehyde
- P024 p-Chloroaniline
- P026 1-(o-Chlorophenyl)thiourea
- P027 3-Chloropropionitrile
- P028 Benzyl chloride
- P029 Copper cyanide
- P030 Cyanides (soluble cyanide salts), not otherwise specified
- P031 Cyanogen
- P033 Cyanogen chloride
- P034 2-Cyclohexyl-4,6-dinitrophenol
- P036 Dichlorophenylarsine
- P037 Dieldrin — an insecticide
- P038 Diethylarsine
- P039 Disulfoton — an organophosphate insecticide
- P040 O,O-Diethyl O-pyrazinyl phosphorothioate
- P041 Diethyl-p-nitrophenyl phosphate
- P042 Epinephrine — adrenaline used as a medicine
- P043 Diisopropylfluorophosphate (DFP)
- P044 Dimethoate — an organophosphate insecticide
- P045 Thiofanox
- P046 alpha,alpha-Dimethylphenethylamine
- P047 4,6-Dinitro-o-cresol and salts
- P048 2,4-Dinitrophenol
- P049 Dithiobiuret
- P050 Endosulfan — an insecticide
- P051 Endrin — an insecticide
- P054 Aziridine
- P056 Fluorine
- P057 Fluoroacetamide
- P058 Fluoroacetic acid, sodium salt
- P059 Heptachlor — an insecticide
- P060 Isodrin — an insecticide
- P062 Hexaethyl tetraphosphate
- P063 Hydrogen cyanide
- P064 Methyl isocyanate
- P065 Mercury fulminate — an explosive compound
- P066 Methomyl — a carbamate insecticide
- P067 1,2-Propylenimine
- P068 Methyl hydrazine
- P069 2-Methyllactonitrile
- P070 Aldicarb — a carbamate insecticide and nematicide
- P071 Methyl parathion — an organophosphate insecticide
- P072 alpha-Naphthylthiourea
- P073 Nickel carbonyl
- P074 Nickel cyanide
- P075 Nicotine and salts
- P076 Nitric oxide
- P077 p-Nitroaniline
- P078 Nitrogen dioxide
- P081 Nitroglycerine — an explosive and heart medicine
- P082 N-Nitrosodimethylamine
- P084 N-Nitrosomethylvinylamine
- P085 Octamethylpyrophosphoramide
- P087 Osmium tetroxide
- P088 Endothall — an aquatic herbicide
- P089 Parathion — an organophosphate insecticide
- P092 Phenylmercury acetate
- P093 Phenylthiourea
- P094 Phorate — an insecticide and nematicide
- P095 Phosgene
- P096 Phosphine
- P097 Famphur — an organophosphate insecticide
- P098 Potassium cyanide
- P099 Potassium silver cyanide
- P101 Ethyl cyanide
- P102 Propargyl alcohol
- P103 Selenourea
- P104 Silver cyanide
- P105 Sodium azide
- P106 Sodium cyanide
- P108 Strychnine and salts — a poison used as a rodenticide
- P109 Tetraethyldithiopyrophosphate
- P110 Tetraethyl lead — an anti-knock gasoline additive
- P111 Tetraethyl pyrophosphate
- P112 Tetranitromethane
- P113 Thallic oxide
- P114 Thallium(I) selenite
- P115 Thallium(I) sulfate
- P116 Thiosemicarbazide
- P118 Trichloromethanethiol
- P119 Ammonium vanadate
- P120 Vanadium pentoxide
- P121 Zinc cyanide
- P122 Zinc phosphide Zn3 P2
- P123 Toxaphene — an insecticide
- P127 Carbofuran — a carbamate insecticide
- P128 Mexacarbate — a carbamate pesticide
- P185 Tirpate — a carbamate pesticide
- P188 Physostigmine salicylate
- P189 Carbosulfan — a carbamate pesticide
- P190 Metolcarb — a carbamate pesticide
- P191 Dimetilan — a carbamate pesticide
- P192 Isolan — a carbamate insecticide
- P194 Oxamyl — a carbamate insecticide and nematicide
- P196 Manganese dimethyldithiocarbamate
- P197 Formparanate — a carbamate pesticide
- P198 Formetanate hydrochloride — a carbamate insecticide
- P199 Methiocarb — a carbamate insecticide
- P201 Promecarb — a carbamate insecticide
- P202 m-Cumenyl methylcarbamate — a carbamate pesticide
- P203 Aldicarb sulfone
- P204 Physostigmine
- P205 Ziram — a dithiocarbamate fungicide
U-listed waste 246 codes
U-listed waste: what each code covers
- U001 Acetaldehyde
- U002 Acetone
- U003 Acetonitrile
- U004 Acetophenone
- U005 2-Acetylaminofluorene
- U006 Acetyl chloride
- U007 Acrylamide
- U008 Acrylic acid
- U009 Acrylonitrile
- U010 Mitomycin C — a chemotherapy drug
- U011 Amitrole — a herbicide
- U012 Aniline
- U014 Auramine
- U015 Azaserine
- U016 Benz[c]acridine
- U017 Benzal chloride
- U018 Benz[a]anthracene
- U019 Benzene
- U020 Benzenesulfonyl chloride
- U021 Benzidine
- U022 Benzo[a]pyrene
- U023 Benzotrichloride
- U024 Dichloromethoxy ethane
- U025 Dichloroethyl ether
- U026 Chlornaphazin
- U027 Dichloroisopropyl ether
- U028 Diethylhexyl phthalate
- U029 Methyl bromide
- U030 4-Bromophenyl phenyl ether
- U031 n-Butyl alcohol
- U032 Calcium chromate
- U033 Carbonic difluoride
- U034 Chloral
- U035 Chlorambucil — a chemotherapy drug
- U036 Chlordane, alpha & gamma isomers — an insecticide
- U037 Chlorobenzene
- U038 Chlorobenzilate — an insecticide used against mites
- U039 p-Chloro-m-cresol
- U041 Epichlorohydrin
- U042 2-Chloroethyl vinyl ether
- U043 Vinyl chloride
- U044 Chloroform
- U045 Methyl chloride
- U046 Chloromethyl methyl ether
- U047 beta-Chloronaphthalene
- U048 o-Chlorophenol
- U049 4-Chloro-o-toluidine, hydrochloride
- U050 Chrysene
- U051 Creosote
- U052 Cresol (cresylic acid)
- U053 Crotonaldehyde
- U055 Cumene
- U056 Cyclohexane
- U057 Cyclohexanone
- U058 Cyclophosphamide — a chemotherapy drug
- U059 Daunomycin — a chemotherapy drug also called daunorubicin
- U060 DDD — an insecticide related to DDT
- U061 DDT — an insecticide
- U062 Diallate — a thiocarbamate herbicide
- U063 Dibenz[a,h]anthracene
- U064 Dibenzo[a,i]pyrene
- U066 1,2-Dibromo-3-chloropropane — a soil fumigant and nematicide
- U067 Ethylene dibromide — a soil and grain fumigant
- U068 Methylene bromide
- U069 Dibutyl phthalate
- U070 o-Dichlorobenzene
- U071 m-Dichlorobenzene
- U072 p-Dichlorobenzene
- U073 3,3′-Dichlorobenzidine
- U074 1,4-Dichloro-2-butene
- U075 Dichlorodifluoromethane
- U076 Ethylidene dichloride
- U077 Ethylene dichloride
- U078 1,1-Dichloroethylene
- U079 1,2-Dichloroethylene
- U080 Methylene chloride
- U081 2,4-Dichlorophenol
- U082 2,6-Dichlorophenol
- U083 Propylene dichloride
- U084 1,3-Dichloropropene
- U085 2,2′-Bioxirane
- U086 N,N′-Diethylhydrazine
- U087 O,O-Diethyl S-methyl dithiophosphate
- U088 Diethyl phthalate
- U089 Diethylstilbesterol
- U090 Dihydrosafrole
- U091 3,3′-Dimethoxybenzidine
- U092 Dimethylamine
- U093 p-Dimethylaminoazobenzene
- U094 7,12-Dimethylbenz[a]anthracene
- U095 3,3′-Dimethylbenzidine
- U096 Hydroperoxide, 1-methyl-1-phenylethyl-
- U097 Dimethylcarbamoyl chloride
- U098 1,1-Dimethylhydrazine — a rocket propellant also called UDMH
- U099 1,2-Dimethylhydrazine
- U101 2,4-Dimethylphenol
- U102 Dimethyl phthalate
- U103 Dimethyl sulfate
- U105 2,4-Dinitrotoluene
- U106 2,6-Dinitrotoluene
- U107 Di-n-octyl phthalate
- U108 1,4-Dioxane
- U109 1,2-Diphenylhydrazine
- U110 Dipropylamine
- U111 Di-n-propylnitrosamine
- U112 Ethyl acetate
- U113 Ethyl acrylate
- U114 Ethylenebisdithiocarbamic acid, salts and esters — pesticide ingredients
- U115 Ethylene oxide
- U116 Ethylenethiourea
- U117 Ethyl ether
- U118 Ethyl methacrylate
- U119 Ethyl methanesulfonate
- U120 Fluoranthene
- U121 Trichloromonofluoromethane
- U122 Formaldehyde
- U123 Formic acid
- U124 Furan
- U125 Furfural
- U126 Glycidylaldehyde
- U127 Hexachlorobenzene
- U128 Hexachlorobutadiene
- U129 Lindane — an insecticide
- U130 Hexachlorocyclopentadiene
- U131 Hexachloroethane
- U132 Hexachlorophene
- U133 Hydrazine
- U134 Hydrofluoric acid
- U135 Hydrogen sulfide
- U136 Cacodylic acid — an arsenical herbicide and defoliant
- U137 Indeno[1,2,3-cd]pyrene
- U138 Methyl iodide
- U140 Isobutyl alcohol
- U141 Isosafrole
- U142 Kepone — an insecticide also called chlordecone
- U143 Lasiocarpine
- U144 Lead acetate
- U145 Lead phosphate
- U146 Lead subacetate
- U147 Maleic anhydride
- U148 Maleic hydrazide — a plant growth regulator and herbicide
- U149 Malononitrile
- U150 Melphalan — a chemotherapy drug
- U151 Mercury
- U152 Methacrylonitrile
- U153 Methanethiol
- U154 Methanol
- U155 Methapyrilene
- U156 Methyl chlorocarbonate
- U157 3-Methylcholanthrene
- U158 4,4′-Methylenebis(2-chloroaniline)
- U159 Methyl ethyl ketone (MEK)
- U160 Methyl ethyl ketone peroxide
- U161 Methyl isobutyl ketone
- U162 Methyl methacrylate
- U163 MNNG
- U164 Methylthiouracil
- U165 Naphthalene
- U166 1,4-Naphthoquinone
- U167 alpha-Naphthylamine
- U168 beta-Naphthylamine
- U169 Nitrobenzene
- U170 p-Nitrophenol
- U171 2-Nitropropane
- U172 N-Nitrosodi-n-butylamine
- U173 N-Nitrosodiethanolamine
- U174 N-Nitrosodiethylamine
- U176 N-Nitroso-N-ethylurea
- U177 N-Nitroso-N-methylurea
- U178 N-Nitroso-N-methylurethane
- U179 N-Nitrosopiperidine
- U180 N-Nitrosopyrrolidine
- U181 5-Nitro-o-toluidine
- U182 Paraldehyde
- U183 Pentachlorobenzene
- U184 Pentachloroethane
- U185 Pentachloronitrobenzene (PCNB)
- U186 1,3-Pentadiene
- U187 Phenacetin
- U188 Phenol
- U189 Sulfur phosphide
- U190 Phthalic anhydride
- U191 2-Picoline
- U192 Pronamide — a herbicide
- U193 1,3-Propane sultone
- U194 n-Propylamine
- U196 Pyridine
- U197 p-Benzoquinone
- U200 Reserpine
- U201 Resorcinol
- U203 Safrole
- U204 Selenious acid
- U205 Selenium sulfide
- U206 Streptozotocin — a cancer medicine
- U207 1,2,4,5-Tetrachlorobenzene
- U208 1,1,1,2-Tetrachloroethane
- U209 1,1,2,2-Tetrachloroethane
- U210 Tetrachloroethylene
- U211 Carbon tetrachloride
- U213 Tetrahydrofuran
- U214 Thallium(I) acetate
- U215 Thallium(I) carbonate
- U216 Thallium(I) chloride
- U217 Thallium(I) nitrate
- U218 Thioacetamide
- U219 Thiourea
- U220 Toluene
- U221 Toluenediamine
- U222 o-Toluidine hydrochloride
- U223 Toluene diisocyanate
- U225 Bromoform
- U226 Methyl chloroform (1,1,1-trichloroethane)
- U227 1,1,2-Trichloroethane
- U228 Trichloroethylene
- U234 1,3,5-Trinitrobenzene
- U235 Tris(2,3-dibromopropyl) phosphate
- U236 Trypan blue
- U237 Uracil mustard — a cancer-treatment compound
- U238 Ethyl carbamate (urethane)
- U239 Xylene
- U240 2,4-D, salts and esters — a herbicide
- U243 Hexachloropropene
- U244 Thiram — a dithiocarbamate fungicide
- U246 Cyanogen bromide (CN)Br
- U247 Methoxychlor — an insecticide
- U248 Warfarin and salts — an anticoagulant medicine and rodenticide
- U249 Zinc phosphide Zn3 P2
- U271 Benomyl — a fungicide
- U278 Bendiocarb — a carbamate insecticide
- U279 Carbaryl — a carbamate insecticide
- U280 Barban — a carbamate herbicide
- U328 o-Toluidine
- U353 p-Toluidine
- U359 2-Ethoxyethanol
- U364 Bendiocarb phenol
- U367 Carbofuran phenol
- U372 Carbendazim — a fungicide
- U373 Propham — a carbamate herbicide
- U387 Prosulfocarb — a thiocarbamate herbicide
- U389 Triallate — a thiocarbamate herbicide
- U394 A2213
- U395 Diethylene glycol, dicarbamate
- U404 Triethylamine
- U409 Thiophanate-methyl — a fungicide
- U410 Thiodicarb — a carbamate insecticide
- U411 Propoxur — a carbamate insecticide