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Chemical Prioritizations

EPA is creating risk-based prioritizations and hazard-based prioritizations for chemicals to determine the need for follow-up data collection or management actions based on their potential risks or hazards. This page provides two ways to search for both risk-based and hazard-based prioritization documents. Read more detailed information about chemical prioritizations. View quick summary tables showing the RBP (PDF), (9 pp., 56 KB, About PDF) and HBP (PDF), (4 pp., 32 KB, About PDF) decisions made by EPA to date.

Use the search box to locate a chemical or chemical category; you may enter partial or complete CAS numbers or chemical/category names:

The following list is an alphabetical index of chemical and category or cluster names for which a Risk-Based Prioritizations or a Hazard-Based Prioritization is available. For chemical categories, click on the "+" symbol to view the CAS numbers and chemical names included in that category. Click here to view chemical Prioritization with CAS Number

CASE Name	Posted Date	Document type
1,2-Ethanediamine, N-ethyl-N-(3-methylphenyl)-	MARCH 2009	RBP
1,3,5-Trioxane	SEPTEMBER 2008	RBP
1,3-Dioxolan-2-one, 4-methyl-	MARCH 2009	RBP
1H-1,2,4-Triazole	MARCH 2009	RBP
2-Amino-2,3-dimethylbutanenitrile	SEPTEMBER 2008	RBP
2-Butenedioic acid (2Z)-, dibutyl ester	SEPTEMBER 2008	RBP
2-Pentanol, 4-methyl-	JULY 2008	RBP
2-Propen-1-ol	AUGUST 2008	RBP
2H-3,1-Benzoxazine-2,4(1H)-dione	MARCH 2009	RBP
3,6,9,12-Tetraazatetradecane-1,14-diamine	SEPTEMBER 2008	RBP
5-Decyne-4,7-diol, 2,4,7,9-tetramethyl-	SEPTEMBER 2008	RBP
7-Benzofuranol, 2,3-dihydro-2,2-dimethyl-	SEPTEMBER 2008	RBP
Acetamide, N-[5-[bis[2-(acetyloxy)ethyl]amino]-2-[(2-bromo-4,6-dinitrophenyl)azo]-4-methoxyphenyl]-	JULY 2008	RBP
Acetic acid, chloro-, ethyl ester	MARCH 2009	RBP
Acetic acid, sulfo-, 1-dodecyl ester, sodium salt	MARCH 2009	RBP
Acetonitrile, [ethyl(3-methylphenyl)amino]-	SEPTEMBER 2008	RBP
Acetyl chloride, dichloro-	MARCH 2008	RBP
Alkyl Acetate C6 - C13 Category     Acetic acid, C7-9-branched alkyl esters, C8-rich Acetic acid, C8-10-branched alkyl esters, C9-rich Acetic acid, C9-11-branched alkyl esters, C10-rich Acetic acid, C11-14-branched alkyl esters, C13-rich Hexanol, acetate, branched and linear Acetic acid, C6-8-branched alkyl esters	MARCH 2008	RBP
Alkyl Nitriles Category     Propanenitrile Butanenitrile Propanenitrile, 2-methyl-	MARCH 2009	RBP
Aluminum Alkyls Cat.     Aluminum, tridocosyl- Aluminum, tri-C2-20-alkyl complexes Aluminum, di-.mu.-chlorochlorotriethyldi- Aluminum, trioctacosyl- Aluminum, tridodecyl- Aluminum, chlorobis(2-methylpropyl)- Aluminum, tributyl- Aluminum, trihexyl- Aluminum, trieicosyl- Aluminum, trioctyl- Aluminum, trioctadecyl- Aluminum, triethyl- Aluminum, chlorodiethyl- Aluminum, tris(2-methylpropyl)- Aluminum, tritetracosyl- Aluminum, tritetradecyl- Aluminum, trihexadecyl- Aluminum, tris(decyl)- Aluminum, trihexacosyl- Aluminum, dichloroethyl-	JULY 2008	RBP
Amines, C12-14-tert-alkyl	AUGUST 2008	RBP
Anethole trans-Anethole     Benzene, 1-methoxy-4-(1E)-1-propenyl- Benzene, 1-methoxy-4-(1-propenyl)-	MARCH 2009	RBP
Benzenamine, 4,4'-oxybis-	MARCH 2009	RBP
Benzene, 1,1'-[1,2-ethanediylbis(oxy)]bis[2,4,6-tribromo-	MARCH 2009	RBP
Benzene, 1,3-bis(1-methylethenyl)-	SEPTEMBER 2008	RBP
Benzene, 1-methoxy-4-(2-propenyl)-	MARCH 2009	RBP
Benzenepropanoic acid, 3,5-bis(1,1-dimethylethyl)-4-hydroxy-, 2-[3-[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]-1-oxopropyl]hydrazide	MARCH 2009	RBP
Benzenepropanol	SEPTEMBER 2008	RBP
Benzenesulfonic acid, hydroxy-	MARCH 2009	RBP
Benzonitrile, 3-methyl-	SEPTEMBER 2008	RBP
Butanoic acid, 3-oxo-, methyl ester	AUGUST 2008	RBP
C7-C9 Aliphatic Aldehydes and Carboxylic Acids Category     Decanal Nonanoic acid Octanoic acid Heptanal Nonanal Heptanoic acid Octanal Hexanal 5-Heptenal, 2,6-dimethyl-	MARCH 2009	RBP
Carboxylic Food Acids and Salts Category     Acetic acid 1,2,3-Propanetricarboxylic acid, 2-hydroxy-, trisodium salt 1,2,3-Propanetricarboxylic acid, 2-hydroxy- 2-Butenedioic acid (2E)- Acetic acid, potassium salt Acetic acid, calcium salt Acetic acid, manganese(2+) salt 1,2,3-Propanetricarboxylic acid, 2-hydroxy-, sodium salt 1,2,3-Propanetricarboxylic acid, 2-hydroxy-, tripotassium salt Acetic acid, magnesium salt Butanedioic acid, hydroxy- Acetic acid, sodium salt Acetic acid, ammonium salt	AUGUST 2008	RBP
Chlorobenzenes Category     Benzene, 1,2,3-trichloro- Benzene, 1,2,4-trichloro- Benzene, 1,2-dichloro- Benzene, 1,3-dichloro- Benzene, 1,4-dichloro- Benzene, chloro-	MARCH 2009	RBP
Cinnamyl Derivatives Category     2-Propenal, 3-phenyl- Heptanal, 2-(phenylmethylene)- Octanal, 2-(phenylmethylene)- Benzenepropanal, 4-(1,1-dimethylethyl)-.alpha.-methyl-	MARCH 2009	RBP
Cyclododecane, 1,2,5,6,9,10-hexabromo-	MARCH 2008	RBP
Cyclohexanone, oxime	SEPTEMBER 2008	RBP
Cyclopropanecarboxylic acid, 3-(2,2-dichloroethenyl)-2,2-dimethyl-, methyl ester	SEPTEMBER 2008	RBP
Dibasic Esters Category     dibasic ester Hexanedioic acid, dimethyl ester Butanedioic acid, dimethyl ester Pentanedioic acid, dimethyl ester	MARCH 2008	RBP
Dicarboxylic acid Category     Butanedioic acid Pentanedioic acid Hexanedioic acid	MARCH 2008	RBP
Diesters Category     Hexanedioic acid, bis(1-methylethyl) ester 2-Butenedioic acid (2Z)-, bis(1,3-dimethylbutyl) ester Hexanedioic acid, dibutyl ester Hexanedioic acid, diisononyl ester Nonanedioic acid, diisodecyl ester 2-Butenedioic acid (2Z)-, dibutyl ester Hexanedioic acid, bis(1-methylheptyl) ester Hexanedioic acid, diisooctyl ester 2-Butenedioic acid (2Z)-, bis(2-ethylhexyl) ester Hexanedioic acid, ditridecyl ester Hexanedioic acid, bis[2-(2-butoxyethoxy)ethyl] ester Decanedioic acid, dimethyl ester Hexanedioic acid, diisodecyl ester Hexanedioic acid, bis(2-ethylhexyl) ester Nonanedioic acid, bis(2-ethylhexyl) ester Hexanedioic acid, di-C7-9-branched and linear alkyl esters Decanedioic acid, bis(2-ethylhexyl) ester	SEPTEMBER 2008	RBP
Diesters Category     Hexanedioic acid, bis(1-methylethyl) ester 2-Butenedioic acid (2Z)-, bis(1,3-dimethylbutyl) ester Hexanedioic acid, dibutyl ester Hexanedioic acid, diisononyl ester Nonanedioic acid, diisodecyl ester 2-Butenedioic acid (2Z)-, dibutyl ester Hexanedioic acid, bis(1-methylheptyl) ester Hexanedioic acid, diisooctyl ester 2-Butenedioic acid (2Z)-, bis(2-ethylhexyl) ester Hexanedioic acid, ditridecyl ester Hexanedioic acid, bis[2-(2-butoxyethoxy)ethyl] ester Decanedioic acid, dimethyl ester Hexanedioic acid, diisodecyl ester Hexanedioic acid, bis(2-ethylhexyl) ester Nonanedioic acid, bis(2-ethylhexyl) ester Hexanedioic acid, di-C7-9-branched and linear alkyl esters Decanedioic acid, bis(2-ethylhexyl) ester	SEPTEMBER 2008	RBP
Diethylbenzene Rich Streams Category     Benzene, diethyl- Benzene, ethylenated, by-products from	MARCH 2009	RBP
Ethane, 1,2-dimethoxy-	MARCH 2008	RBP
Ethane,1-1'-oxybis[2-methoxy-	MARCH 2008	RBP
Ethanol, 2-(2-aminoethoxy)-	MARCH 2009	RBP
Ethylphenols Category     Phenol, 3-ethyl- Phenol, 4-ethyl- Phenol, 2-ethyl- Ethylphenol isomer mixture	SEPTEMBER 2008	RBP
Fatty Acid Dimers and Trimer Category     Fatty acids, C18-unsatd., trimers Fatty acids, C18-unsatd., dimers Fatty acids, C18-unsatd., dimers, hydrogenated Fatty acids, C16-18 and C18-unsatd., dimerized	MARCH 2009	RBP
Fatty Nitrogen Derived Cationics Category     Quaternary ammonium compounds, pentamethyltallow alkyltrimethylenedi-, dichlorides Quaternary ammonium compounds, di-C14-18-alkyldimethyl, Me sulfates Quaternary ammonium compounds, dimethylditallow alkyl, chlorides 1-Octadecanaminium, N,N,N-trimethyl-, chloride Quaternary ammonium compounds, di-C12-18-alkyldimethyl, chlorides 1-Hexadecanaminium, N,N,N-trimethyl-, chloride Quaternary ammonium compounds, benzyl-C12-16-alkyldimethyl, chlorides 1-Hexadecanaminium, N,N-dihexadecyl-N-methyl-, chloride 1-Decanaminium, N-decyl-N,N-dimethyl-, chloride Quaternary ammonium compounds, trimethyltallow alkyl, chlorides 1-Dodecanaminium, N,N,N-trimethyl-, chloride Quaternary ammonium compounds, bis(hydrogenated tallow alkyl)dimethyl, chlorides Quaternary ammonium compounds, di-C14-18-alkyldimethyl, chlorides Quaternary ammonium compounds, bis(hydroxyethyl)methyltallow alkyl, chlorides Quaternary ammonium compounds, bis(hydrogenated tallow alkyl)dimethyl, Me sulfates Quaternary ammonium compounds, dicoco alkyldimethyl, chlorides	MARCH 2009	RBP
Formamide, N-methyl-	MARCH 2009	RBP
Guanidine, N,N'-diphenyl-	MARCH 2009	RBP
Hexanedioic acid, bis(2-ethylhexyl) ester	SEPTEMBER 2008	RBP
Hexanedioic acid, di-C7-9-branched and linear alkyl esters	SEPTEMBER 2008	RBP
Hexanoic acid, 4,6,6,6-tetrachloro-3,3-dimethyl-, methyl ester	SEPTEMBER 2008	RBP
Mercury	NOVEMBER 2008	RBP
Methane, bromochloro-	MARCH 2009	RBP
Methane, oxybis-	MARCH 2009	RBP
Methanesulfonic acid	JULY 2008	RBP
Morpholine, 4-[(4-morpholinylthio)thioxomethyl]-	MARCH 2009	RBP
Neoacids C5-C28 Category     Neodecanoic acid Hexanoic acid, 3,5,5-trimethyl- Isooctanoic acid Fatty acids, C9-13-neo- Fatty acids, C9-28-neo- Propanoic acid, 2,2-dimethyl-, methyl ester Carboxylic acids, C6-8-neo- Propanoic acid, 2,2-dimethyl-	MARCH 2009	RBP
Oxirane, (butoxymethyl)-	JULY 2008	RBP
Petroleum Additive Alkaryl Sulfonate Category     Sulfonic acids, petroleum, sodium salts Benzenesulfonic acid, C14-24-branched and linear alkyl derivs., calcium salts Benzenesulfonic acid, mono-C15-30-branched alkyl and di-C11-13-branched and linear alkyl derivs. Benzenesulfonic acid, mono- and dialkyl derivs., magnesium salts Benzenesulfonic acid, mono- and di-C15-30-alkyl derivs., sodium salts Benzenesulfonic acid, mono-C15-30-branched alkyl and di-C11-13-branched and linear alkyl derivs., calcium salts, overbased Benzenesulfonic acid, C14-24-branched and linear alkyl derivs., calcium salts, overbased Benzenesulfonic acid, C14-24-branched and linear alkyl derivs. Sulfonic acids, petroleum, calcium salts Sulfonic acids, petroleum, calcium salts, overbased Sulfonic acids, petroleum, barium salts Benzenesulfonic acid, mono-C16-24-alkyl derivs., calcium salts	AUGUST 2008	RBP
Phenol, 2,4,6-trimethyl-	JULY 2008	RBP
Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1)	MARCH 2009	RBP
Phenol, 2,4-dichloro-, sodium salt	MARCH 2009	RBP
Phenol, 2-[(2-methyl-2-propenyI)oxy]; Methyallyloxyphenol	SEPTEMBER 2008	RBP
Phenol, 3-(chloromethyl)-6-(1,1-dimethylethyl)-2,4-dimethyl-	SEPTEMBER 2008	RBP
Phenol, 3-[2-chloro-4-(trifluoromethyl)phenoxy]-, acetate	MARCH 2009	RBP
Phenol, tert-Bu derivs., phosphates (3:1)	JULY 2008	RBP
Phosphonic acid, dibutyl ester	MARCH 2009	RBP
Propanoic acid, 2-hydroxy-	AUGUST 2008	RBP
Propanoic acid, 3,3'-thiobis-, dimethyl ester	MARCH 2009	RBP
Pyridine, 2-chloro-	MARCH 2009	RBP
Quaternary ammonium compounds, benzyl(hydrogenated tallow alkyl)dimethyl, chlorides	MARCH 2009	RBP
Quaternary ammonium compounds, benzyl-C12-16-alkyldimethyl, chlorides	MARCH 2009	RBP
Quaternary ammonium compounds, benzylbis(hydrogenated tallow alkyl)methyl, chlorides	MARCH 2009	RBP
Rosin Adducts and Adducts Salts Category     Rosin, fumarated maleated Rosin, maleated Resin acids and Rosin acids, fumarated, sodium salts Resin acids and Rosin acids, fumarated, potassium salts maleated rosin potassium salt Rosin, fumarated	SEPTEMBER 2008	RBP
Rosin Esters Category     Resin acids and Rosin acids, esters with pentaerythritol Resin acids and Rosin acids, hydrogenated, esters with glycerol Resin acids and Rosin acids, Me esters Resin acids and Rosin acids, esters with glycerol Resin acids and Rosin acids, hydrogenated, Me esters Resin acids and Rosin acids, hydrogenated, esters with pentaerythritol Resin acids and Rosin acids, esters with diethylene glycol	SEPTEMBER 2008	RBP
Rosins and Rosin Salts Category     Rosin, hydrogenated Rosin, distn. overheads Resin acids and Rosin acids, sodium salts Rosin Rosin, low-boiling fraction Resin acids and Rosin acids, potassium salts	SEPTEMBER 2008	RBP
Tall Oil Fatty Acids and Related Substances Category     Fatty acids, tall-oil, low-boiling Octadecanoic acid, branched and linear Fatty acids, tall-oil, sodium salts Fatty acids, tall-oil Fatty acids, tall-oil, potassium salts Fatty acids, C16-18 and C18-unsatd., branched and linear	SEPTEMBER 2008	RBP
Tall Oil and Related Substances Category     Tall oil, sodium salt Tall-oil pitch Tall oil Tall oil, disproportionated, potassium salt Tall oil, potassium salt Tall oil, disproportionated Tall-oil pitch, sodium salt Wastewater, tall-oil soap acidulation	SEPTEMBER 2008	RBP
Urea, N-(4-chlorophenyl)-N'-(3,4-dichlorophenyl)-	MARCH 2009	RBP
Zinc Dialkyldithiophosphate Category     Phosphorodithioic acid, mixed O,O-bis(1,3-dimethylbutyl and iso-Pr) esters, zinc salts Zinc, bis[O,O-bis(dodecylphenyl) phosphorodithioato-.kappa.S,.kappa.S']- Zinc, bis(O,O-diisooctyl phosphorodithioato-.kappa.S,.kappa.S')- Zinc, bis(O,O-diisodecyl phosphorodithioato-.kappa.S,.kappa.S')- Zinc, bis[O,O-bis(tetrapropylenephenyl) phosphorodithioato-.kappa.S,.kappa.S']- Zinc, bis[O,O-bis(2-ethylhexyl) phosphorodithioato-.kappa.S,.kappa.S']-, (T-4)- Phosphorodithioic acid, mixed O,O-bis(sec-Bu and isooctyl) esters, zinc salts Phosphorodithioic acid, mixed O,O-bis(iso-Bu and pentyl) esters, zinc salts Phosphorodithioic acid, mixed O,O-bis(sec-Bu and 1,3-dimethylbutyl) esters, zinc salts Zinc, bis[O-(2-ethylhexyl) O-(2-methylpropyl) phosphorodithioato-.kappa.S,.kappa.S']-, (T-4)- Phosphorodithioic acid, mixed O,O-bis(iso-Bu and isooctyl and pentyl) esters, zinc salts Zinc, bis[O,O-bis(1,3-dimethylbutyl) phosphorodithioato-.kappa.S,.kappa.S']-, (T-4)-	SEPTEMBER 2008	RBP
n-Butyric Acid/Anhydride Category     Butanoic acid Butanoic acid, anhydride	MARCH 2008	RBP
n-alkyl carboxylic acids     Nonanoic acid Octanoic acid Octadecanoic acid Dodecanoic acid Hexadecanoic acid Decanoic acid Tetradecanoic acid Carboxylic acids, C5-9 Fatty acids, C14-18 Fatty acids, C16-18 Fatty acids, C6-12 Fatty acids, C10-16 Fatty acids, C14-22 Fatty acids, C8-10 Fatty acids, C16-22 Fatty acids, C14 Eicosanoic acid	DECEMBER 2008	RBP
Alkyl Esters of Unsaturated Alcohols Cluster     Heptanoic acid, 2-propenyl ester 2,6-Octadien-1-ol, 3,7-dimethyl-, acetate, Z- 2-Buten-1-ol, 3-methyl-, acetate 3-Hexen-1-ol, acetate, Z- Hexadecanoic acid, 2E-3,7-dimethyl-2,6-octadien-1-yl ester	OCTOBER 2008	HBP
Alkyl Esters of Unsaturated Fatty Acids Cluster     9-Octadecenoic acid Z-, propyl ester 9-Octadecenoic acid Z-, ethyl ester 9,12-Octadecadienoic acid Z,Z-, ethyl ester 13-Docosenoic acid, methyl ester, Z- 9-Octadecenoic acid Z-, octyl ester 9-Octadecenoic acid Z-, dodecyl ester 9-Octadecenoic acid Z-, C12-15-alkyl esters	OCTOBER 2008	HBP
Alkyl Ureas Cluster     Urea, ethyl- Urea, tetraethyl- Urea, tetrabutyl- Urea, [3-dimethylaminopropyl]- Urea, N,N-bis[3-dimethylaminopropyl]-	OCTOBER 2008	HBP
Alkylphenols Cluster     Phenol, 2or 4-sec-tetracosyl- Phenol, 2or 4-sec-hexacosyl- Phenol, 2or 4-sec-octacosyl- Phenol, 2or 4-sec-triacontyl- Phenol, 2,4-dimethyl-6-1-methylpentadecyl- Phenol, 2-nonyl-, branched	OCTOBER 2008	HBP
Alpha Hydroxy Internal Alkynes Cluster     3-Hexyne-2,5-diol, 2,5-dimethyl- 4-Octyne-3,6-diol, 3,6-dimethyl- 6-Dodecyne-5,8-diol, 2,5,8,11-tetramethyl-	MARCH 2009	HBP
Alpha Hydroxy Terminal Alkynes Cluster     1-Pentyn-3-ol, 3-methyl- 1-Hexyn-3-ol, 3,5-dimethyl- 1-Octyn-3-ol, 4-ethyl-	MARCH 2009	HBP
Branched Alkyl Amines Cluster     2-Butanamine, N-ethyl-3-methyl- 1-Hexanamine, 2-ethyl-N-(2-ethylhexyl)- 1-Butanamine, 2-methyl-N-2-methylbutyl- 1-Pentanamine, N-2-methylbutyl- 1-Tridecanamine, N-tridecyl-, branched 1,5-Pentanediamine, 2-methyl-N,N'-bis(1-methylethyl)-	SEPTEMBER 2008	HBP
Butenedioic Acid Dialkyl Esters Cluster     2-Butenedioic acid (2Z)-, dicyclohexyl ester 2-Butenedioic acid (2E)-, di-C8-18-alkyl esters 2-Butenedioic acid (E)-, bis(2-ethylhexyl) ester 2-Butenedioic acid (Z)-, didodecyl ester 2-Butenedioic acid (Z)-, bis(2-methylpropyl) ester 2-Butenedioic acid (Z)-, ditridecyl ester 2-Butenedioic acid (Z)-, diisononyl ester 2-Butenedioic acid (E)-, di-C12-18-alkyl esters 2-Butenedioic acid (2Z)-, 1,4-diethyl ester 2-Butenedioic acid (2Z)-, 1,4-dimethyl ester	MARCH 2009	HBP
Chloroanilines Cluster     Benzenamine, 4-chloro- Benzenamine, 3-chloro-4-methyl- Benzenamine, 5-chloro-2-methyl-	SEPTEMBER 2008	HBP
Linear Alkyl Diacids Cluster     Decanedioic acid Nonanedioic acid Carboxylic acids, C6-18 and C8-15-di- Carboxylic acids, di-, C4-11 Propanedioic acid Undecanedioic acid Carboxylic acids, di-, C4-6 Hexanedioic acid, ammonium salt (1:2) Hexanedioic acid, lithium salt (1:2)	MARCH 2009	HBP
Simple Alpha Hydroxy Carboxylic Acids Cluster     Propanoic acid, 2-hydroxy-, (2S)- Acetic acid, hydroxy-, potassium salt Acetic acid, 2-hydroxy-, potassium salt (1:1)	MARCH 2009	HBP
n-Alkyl Aldehydes Cluster     Decanal Hexanal Undecanal Dodecanal	MARCH 2009	HBP

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