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TSCA Status Checker

Free tool

Check whether a substance appears on the non-confidential TSCA Inventory, and what commercial-activity designation and regulatory flags EPA records against it.

Chemical Abstracts names use inverted word order and dot notation for Greek letters ("Benzene, ethyl-", ".alpha."). Plain and Greek spellings both match.

Snapshot: EPA non-confidential TSCA Inventory, Last created: 07/2026. Counts and status reflect that release only, and are scoped to the non-confidential listings.

These results are list-membership facts as of the dated copy of each list identified on the result. Absence from these lists is not evidence of safety or of regulatory non-applicability. Safety Data Sheets and the primary source lists remain authoritative.

Reference only. Not legal or regulatory advice. Verify against the primary source before you act.

How it works

The TSCA Inventory is EPA's list of chemical substances in US commerce. This tool looks a substance up in a dated copy of the non-confidential portion and reports what EPA records against it: the CA Index Name, the CAS Registry Number, the commercial-activity designation, and any regulatory flags.

ACTIVE and INACTIVE are commercial-activity designations under 40 CFR part 710, subpart B. EPA designates a substance ACTIVE if it is an interim active substance (reported under the Chemical Data Reporting rule, 40 CFR part 711, as manufactured in any of 2010–2015), is a naturally occurring chemical substance as described in 40 CFR 710.27(b), was added to the Inventory on or after June 21, 2006 pursuant to a Notice of Commencement received on or after that date, or was designated active by EPA based on receipt of a Notice of Activity. EPA designates a substance INACTIVE when the substance required a designation and no such notice was received. INACTIVE substances remain listed on the Inventory.

Absence is not proof of absence.This copy carries the 70,774 non-confidential listings. A further 15,967 listings sit in the confidential portion under EPA accession numbers, with no CAS number at all — so a substance missing here may still be on the Inventory. The two portions together reconcile to EPA's published total for this release.

Counts are scoped to the non-confidential portion.EPA publishes an active count spanning both portions; the figures this tool reports never do. Any statistic here means "among the non-confidential listings".

Names are Chemical Abstracts Index Names, shown verbatim.They use inverted word order ("Benzene, ethyl-") and dot notation for Greek letters (".alpha."). The search accepts plain spellings and Greek characters alike, but the result always shows EPA's exact string — a name is evidence, and editing it would make it something else. A CA Index Name can also be carried by more than one listing; where that happens, every match is shown rather than one being chosen.

This tool states inventory status only. It does not tell you whether a substance may be manufactured, processed or imported, what notifications may be required, or what an INACTIVE designation obliges anyone to do. Those questions are answered by the regulations themselves, not by a status lookup.

Snapshot: EPA non-confidential TSCA Inventory, Last created: 07/2026. Flag definitions are EPA's own, quoted verbatim from that page.

Worked example

Searching a CAS number. Entering 71-43-2 returns "Benzene", designated ACTIVE, with no regulatory flags. CAS numbers are unique across this release, so a CAS search returns at most one listing.

Searching a common name. Entering Ethylbenzene returns the listing stored as "Benzene, ethyl-" — the CA Index Name, in inverted order. The tool reaches it through a synonym, and says so.

A flagged listing. 50-30-6 ("Benzoic acid, 2,6-dichloro-") carries three flags: PMN, S and 5E. Each expands to EPA's full definition — a commenced PMN substance, identified in a final Significant New Use Rule, and the subject of a TSCA section 5(e) order.

A substance that is not there. 546-88-3 (acetohydroxamic acid) returns "not on the non-confidential TSCA Inventory", with the caveat that confidential listings exist under accession numbers and cannot be searched by CAS. That is a statement about this file, not about the Inventory.

Sources

  • TSCA Chemical Substance Inventory, non-confidential portion

    U.S. Environmental Protection Agency, Last created: 07/2026

    Toxic Substances Control Act §8(b)

    Covers the non-confidential listings only. Confidential listings exist under EPA accession numbers and cannot be searched by CAS.

    open the source

  • Commercial activity designation, active and inactive substances

    U.S. Environmental Protection Agency, eCFR, title 40, current text

    40 CFR part 710 subpart B

    open the source

Related tools

Data vintage

  • Data: TSCA Chemical Substance Inventory, non-confidential portion, U.S. EPA, Office of Chemical Safety and Pollution Prevention Last created: 07/2026, retrieved 2026-08-14, 70,774 rows.The non-confidential portion only. Substances whose identity is claimed as confidential business information are absent from this file, so absence is not evidence that a substance is not on the Inventory. EPA labels the release 07/2026 and generated the CSVs on 2026-07-21; both facts are recorded because they differ.

last updated 2026-08-14