TSCA Inventory reference pages

TSCA Inventory substances, A to Z

The public portion of the EPA TSCA Chemical Substance Inventory holds 70,774 substances in the July 2026 release. Ambrose publishes a reference page per substance and releases them in batches, and 228 are listed here so far. Each page gives the CAS number, the name EPA publishes, whether the substance is active or inactive in US commerce, and every regulatory flag on the listing with what it obliges.

The TSCA Inventory lookup searches all 70,774 substances by CAS number or name, and the flag reference decodes every code EPA publishes alongside a listing.

A

B

C

D

E

G

H

I

L

M

N

O

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Other

About the TSCA Inventory list

How many substances are on the TSCA Inventory?

The non-confidential portion of the EPA TSCA Chemical Substance Inventory holds 70,774 substances in the July 2026 release. EPA maintains a confidential portion it does not publish, roughly 16,000 more, identified by accession number rather than CAS number. Ambrose publishes a reference page per substance and releases them in batches; 228 are listed here so far.

Where can I search the whole TSCA Inventory?

The TSCA Inventory lookup searches all 70,774 public substances by CAS number or chemical name, including the ones whose reference page has not been released yet. It is free and needs no account.

What is on each substance page?

The CAS number, the Chemical Abstracts Index Name EPA publishes, the commercial activity designation, every EPA regulatory flag on the listing with EPA's own definition and what it obliges, the structure where a public one is known, and which Inventory release the answer came from.

A CAS number absent from this list is absent from the public record. It is not a finding that the substance is unlisted on the TSCA Inventory, because EPA does not publish the confidential portion. Absence is established through a bona fide intent submission under 40 CFR 720.102(e)(1)(ii).

Background reading