In December 2019, EPA designated 20 High-Priority substances to undergo risk evaluation under the Toxic Substances Control Act (TSCA). The final scope documents for these substances are available below. Also below is EPA's response to comments received on the draft scope documents, released in April 2020. You can find additional information in the docket relevant to this action (EPA-HQ-OPPT-2019-0131) or in the individual dockets for each of the chemicals. View the final list of businesses subject to fees for these 20 risk evaluations.
You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.- Summary of and Response to Comments on Draft Scope Documents (PDF)(134 pp, 960 K)
- 1,3-Butadiene, CASRN 106-99-0, Final scope (PDF)(127 pp, 2 MB)
- p-Dichlorobenzene (Benzene, 1,4-dichloro-), CASRN 106-46-7, Final scope (PDF)(137 pp, 3 MB)
- 1,1-Dichloroethane, CASRN 75-34-3, Final scope (PDF)(112 pp, 3 MB)
- 1,2-Dichloroethane, CASRN 107-06-2, Final scope (PDF)(127 pp, 3 MB)
- trans-1,2- Dichloroethylene, CASRN 156-60-5, Final scope (PDF)(132 pp, 3 MB)
- 1,2-Dichloropropane, CASRN 78-87-5, Final scope (PDF)(119 pp, 2 MB)
- Ethylene dibromide (Ethane, 1,2-dibromo-), CASRN 106-93-4, Final scope (PDF)(117 pp, 3 MB)
- 1,3,4,6,7,8-Hexahydro-4,6,6,7,8,8-hexamethylcyclopenta [g]-2-benzopyran (HHCB), CASRN 1222-05-5, Final scope (PDF)(111 pp, 3 MB)
- 4,4'-(1-Methylethylidene)bis[2, 6-dibromophenol] (TBBPA), CASRN 79-94-7, Final scope (PDF)(115 pp, 3 MB)
- Triphenyl Phosphate (TPP), CASRN 115-86-6, Final scope (PDF)(113 pp, 3 MB)
- 1,1,2-Trichloroethane, CASRN 79-00-5, Final scope (PDF)(119 pp, 3 MB)
- Tris(2-chloroethyl) phosphate (TCEP), CASRN 115-96-8, Final scope (PDF)(107 pp, 3 MB)
- Diethylhexyl Phthalate CASRN 117-81-7, Final scope (PDF)(148 pp, 3 MB)
- Dicyclohexyl Phthalate, CASRN 84-61-7, Final scope (PDF)(102 pp, 3 MB)
- Diisobutyl Phthalate, CASRN 84-69-5, Final scope (PDF)(117 pp, 3 MB)
- Butyl Benzyl Phthalate, CASRN 85-68-7, Final scope (PDF)(122 pp, 3 MB)
- Dibutyl Phthalate, CASRN 84-74-2, Final scope (PDF)(141 pp, 3 MB)
- Phthalic Anhydride, CASRN 85-44-9, Final scope (PDF)(126 pp, 2 MB)
- o-Dichlorobenzene (Benzene, 1,2-dichloro-), CASRN 95-50-1, Final scope (PDF)(136 pp, 2 MB)
- Formaldehyde, CASRN 50-0-0, Final scope (PDF)(172 pp, 4 MB)