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Assessing and Managing Chemicals under TSCA

List of Chemicals Undergoing Prioritization

As required under section 6(b) of the Toxic Substances Control Act (TSCA), EPA must conduct a prioritization process to determine if chemical substances are a high or low priority for risk evaluation.

On March 20, 2019, EPA issued the following list of 40 chemicals to begin the prioritization process. TSCA requires EPA to publish this list of 40 chemicals to begin the prioritization process to designate 20 chemicals as “high-priority” for subsequent risk evaluation and to designate 20 chemicals as “low-priority,” meaning that risk evaluation is not warranted at this time. Publication in the Federal Register activates a statutory requirement for EPA to complete the prioritization process in the next nine to twelve months, allowing EPA to designate 20 chemicals as high priority and 20 chemicals as low priority by December 2019.

Chemical Name CAS Docket Number Status* Agency Contact
High Priority Candidates
p-Dichlorobenzene 106-46-7 EPA-HQ-OPPT-2018-0446 Initiated Eileen Sheehan
Email:
Sheehan.eileen@epa.gov
Phone: 415-972-3287
1,2-Dichloroethane 107-06-2 EPA-HQ-OPPT-2018-0427 Initiated Tyler Lloyd
Email:
Lloyd.tyler@epa.gov
Phone:  202-564-4016
trans-1,2- Dichloroethylene 156-60-5 EPA-HQ-OPPT-2018-0465 Initiated Toni Krasnic
Email:
mailto:Krasnic.toni@epa.gov
Phone:  202-564-0984
o-Dichlorobenzene 95-50-1 EPA-HQ-OPPT-2018-0444 Initiated Eileen Sheehan
Email:
Sheehan.eileen@epa.gov
Phone: 415-972-3287
1,1,2-Trichloroethane 79-00-5 EPA-HQ-OPPT-2018-0421 Initiated Tyler Lloyd
Email:
Lloyd.tyler@epa.gov
Phone:  202-564-4016
1,2-Dichloropropane 78-87-5 EPA-HQ-OPPT-2018-0428 Initiated Chen Wen
Email: 
Wen.chen@epa.gov
Phone:  202-564-8849
1,1-Dichloroethane 75-34-3 EPA-HQ-OPPT-2018-0426 Initiated Chen Wen
Email: 
Wen.chen@epa.gov
Phone:  202-564-8849
Dibutyl phthalate (DBP) (1,2-Benzene- dicarboxylic acid, 1,2- dibutyl ester) 84-74-2 EPA-HQ-OPPT-2018-0503 Initiated Peter Gimlin
Email: 
Gimlin.peter@epa.gov
Phone:  202-564-0515
Butyl benzyl phthalate (BBP) - 1,2-Benzene- dicarboxylic acid, 1- butyl 2(phenylmethyl) ester 85-68-7 EPA-HQ-OPPT-2018-0501 Initiated Shayna Sellars
Email: 
Sellars.shayna@epa.gov
Phone:  202-564-1411
Di-ethylhexyl phthalate (DEHP) - (1,2-Benzene- dicarboxylic acid, 1,2- bis(2-ethylhexyl) ester) 117-81-7 EPA-HQ-OPPT-2018-0433 Initiated Lea Carmichael
Email: 
Carmichael.lea@epa.gov
Phone:  202-564-4689
Di-isobutyl phthalate (DIBP) - (1,2-Benzene- dicarboxylic acid, 1,2- bis-(2methylpropyl) ester) 84-69-5 EPA-HQ-OPPT-2018-0434 Initiated John Yowell
Email: 
Yowell.john@epa.gov
Phone:  202-564-1213
Dicyclohexyl phthalate 84-61-7 EPA-HQ-OPPT-2018-0504 Initiated Mike Wilson
Email: 
Wilson.mike@epa.gov
Phone: 202-566-0521
4,4'-(1-Methylethylidene)bis[2, 6-dibromophenol] (TBBPA) 79-94-7 EPA-HQ-OPPT-2018-0462 Initiated Hannah Braun
Email: 
Braun.hannah@epa.gov
Phone: 202-566-5614
Tris(2-chloroethyl) phosphate (TCEP) 115-96-8 EPA-HQ-OPPT-2018-0476 Initiated Claudia Menasche
Email: Menasche.claudia@epa.gov
Phone: 202-564-3391
Phosphoric acid, triphenyl ester (TPP) 115-86-6 EPA-HQ-OPPT-2018-0458 Initiated Sue Slotnick
Email: Slotnick.sue@epa.gov
Phone: 202-564-1973
Ethylene dibromide 106-93-4 EPA-HQ-OPPT-2018-0488 Initiated Meredith Comnes
Email:
Comnes.meredith@epa.gov
Phone: 202-564-1973
1,3-Butadiene 106-99-0 EPA-HQ-OPPT-2018-0451 Initiated Jeff Taylor
Email:
Taylor.jeffrey@epa.gov
Phone: 202-564-8828
1,3,4,6,7,8-Hexahydro-4,6,6,7,8,8-hexamethylcyclopenta [g]-2-benzopyran (HHCB) 1222-05-5 EPA-HQ-OPPT-2018-0430 Initiated Ana Corado
Email:
Corado.ana@epa.gov
Phone: 202-564-0140
Formaldehyde 50-00-0 EPA-HQ-OPPT-2018-0438 Initiated Todd Coleman
Email:
Coleman.todd@epa.gov
Phone: 202-564-0140
Phthalic anhydride 85-44-9 EPA-HQ-OPPT-2018-0459 Initiated Marc Edmonds
Email:
 Edmonds.marc@epa.gov
Phone: 202-566-0758
*Status is listed as either:
  • Initiated – The first step of the prioritization process, and the chemical is currently undergoing a screening level review of reasonably available information to inform its priority designation;
  • Proposed – The second step of the prioritization process, when EPA proposes a chemical’s designation as either high or low priority for risk evaluation; or
  • High/Low - The final step of the prioritization process. This chemical has been designated as high or low priority for risk evaluation.
Chemical Name CAS Docket Number Status* Agency Contact
Low Priority Candidates
1-Butanol, 3-methoxy-, 1-acetate 4435-53-4 EPA-HQ-OPPT-2019-0106 Initiated Lauren Sweet
Email:
 Sweet.lauren@epa.gov
Phone: 202-564-0376
D-gluco-Heptonic acid, sodium salt (1:1), (2.xi.)- 31138-65-5 EPA-HQ-OPPT-2019-0107 Initiated Lauren Sweet
Email:
 Sweet.lauren@epa.gov
Phone: 202-564-0376
D-Gluconic acid 526-95-4 EPA-HQ-OPPT-2019-0108 Initiated Lauren Sweet
Email:
 Sweet.lauren@epa.gov
Phone: 202-564-0376
D-Gluconic acid, calcium salt (2:1) 299-28-5 EPA-HQ-OPPT-2019-0109 Initiated Lauren Sweet
Email: 
Sweet.lauren@epa.gov
Phone: 202-564-0376
D-Gluconic acid, .delta.-lactone 90-80-2 EPA-HQ-OPPT-2019-0110 Initiated Lauren Sweet
Email: 
Sweet.lauren@epa.gov
Phone: 202-564-0376
D-Gluconic acid, potassium salt (1:1) 299-27-4 EPA-HQ-OPPT-2019-0111 Initiated Lauren Sweet
Email: 
Sweet.lauren@epa.gov
Phone: 202-564-0376
D-Gluconic acid, sodium salt (1:1) 527-07-1 EPA-HQ-OPPT-2019-0112 Initiated Lauren Sweet
Email: 
Sweet.lauren@epa.gov
Phone: 202-564-0376
Decanedioic acid, 1,10-dibutyl ester 109-43-3 EPA-HQ-OPPT-2019-0113 Initiated Lauren Sweet
Email: 
Sweet.lauren@epa.gov
Phone: 202-564-0376
1-Docosanol 661-19-8 EPA-HQ-OPPT-2019-0114 Initiated Lauren Sweet
Email: 
Sweet.lauren@epa.gov
Phone: 202-564-0376
1-Eicosanol 629-96-9 EPA-HQ-OPPT-2019-0115 Initiated Lauren Sweet
Email: 
Sweet.lauren@epa.gov
Phone: 202-564-0376
1,2-Hexanediol 6920-22-5 EPA-HQ-OPPT-2019-0116 Initiated Lauren Sweet
Email: 
Sweet.lauren@epa.gov
Phone: 202-564-0376
1-Octadecanol 112-92-5 EPA-HQ-OPPT-2019-0117 Initiated Lauren Sweet
Email: 
Sweet.lauren@epa.gov
Phone: 202-564-0376
Propanol, [2-(2-butoxymethylethoxy)methylethoxy]- 55934-93-5 EPA-HQ-OPPT-2019-0118 Initiated Lauren Sweet
Email: 
Sweet.lauren@epa.gov
Phone: 202-564-0376
Propanedioic acid, 1,3-diethyl ester 105-53-3 EPA-HQ-OPPT-2019-0119 Initiated Lauren Sweet
Email: 
Sweet.lauren@epa.gov
Phone: 202-564-0376
Propanedioic acid, 1,3-dimethyl ester 108-59-8 EPA-HQ-OPPT-2019-0120 Initiated Lauren Sweet
Email: 
Sweet.lauren@epa.gov
Phone: 202-564-0376
Propanol, 1(or 2)-(2-methoxymethylethoxy)-, acetate 88917-22-0 EPA-HQ-OPPT-2019-0121 Initiated Lauren Sweet
Email: 
Sweet.lauren@epa.gov
Phone: 202-564-0376
Propanol, [(1-methyl-1,2-ethanediyl)bis(oxy)]bis- 24800-44-0 EPA-HQ-OPPT-2019-0122 Initiated Lauren Sweet
Email: 
Sweet.lauren@epa.gov
Phone: 202-564-0376
2-Propanol, 1,1'-oxybis- 110-98-5 EPA-HQ-OPPT-2019-0123 Initiated Lauren Sweet
Email: 
Sweet.lauren@epa.gov
Phone: 202-564-0376
Propanol, oxybis- 25265-71-8 EPA-HQ-OPPT-2019-0124 Initiated Lauren Sweet
Email: 
Sweet.lauren@epa.gov
Phone: 202-564-0376
Tetracosane, 2,6,10,15,19,23-hexamethyl- 111-01-3 EPA-HQ-OPPT-2019-0125 Initiated Lauren Sweet
Email: 
Sweet.lauren@epa.gov
Phone: 202-564-0376
*Status is listed as either:
  • Initiated – The first step of the prioritization process, and the chemical is currently undergoing a screening level review of reasonably available information to information its priority designation;
  • Proposed – The second step of the prioritization process, when EPA proposes a chemical’s designation as either high or low priority for risk evaluation; or
  • High/Low - The final step of the prioritization process. This chemical has been designated as high or low priority for risk evaluation.