PFAS Screener
Free tool
Enter one substance — name or CAS number — and see whether it appears on EPA's TSCA §8(a)(7) PFAS reference list, checked against a dated copy of EPA's published CompTox export.
A reference-list match is not a reportability determination. EPA publishes this list as a reference aid to the TSCA §8(a)(7) reporting rule codified at 40 CFR part 705, which defines the substances it covers by chemical structure, not by a list of named substances. EPA states this list is non-exhaustive, and that it excludes polymers and UVCBs that may still be reportable.
The two directions are therefore not symmetric. A match tells you the substance is on EPA's published reference list. An absence tells you only that — it is notevidence that a substance falls outside the rule's structural definition, and not evidence that nothing is reportable.
This tool states no dates. Who must report, the period reported on, and the submission window are all set by 40 CFR part 705, and that rule has been amended. Read them in the regulation currently in force at eCFR — 40 CFR part 705, never from this page: it carries no deadline because it has no way to keep one current.
This tool reports reference-list membership only. It does not apply the structural definition, decide whether you are a person who must report, or tell you whether a report is due. The list itself is published at EPA CompTox — TSCA §8(a)(7) PFAS list (PFAS8a7v3).
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.
PFAS reference data: U.S. EPA CompTox Chemicals Dashboard (public domain).
Data as of: EPA TSCA §8(a)(7) PFAS reference list 2026-08-01 — EPA CompTox list PFAS8a7v3, exported 2026-08-01.
Reference only. Not legal or regulatory advice. Verify against the primary source before you act.
How it works
This tool screens a single substance — by name or by CAS number — against a dated copy of the EPA TSCA §8(a)(7) PFAS reference listpublished on EPA's CompTox Chemicals Dashboard. The copy used here is EPA CompTox list PFAS8a7v3, exported 2026-08-01. It screens that list and nothing else: no other jurisdiction, no other PFAS definition, no other list.
Matching is exact, never fuzzy. A CAS number matches only an identical CAS token, and a name matches only a preferred name on the list or a curated synonym of one — so PFOA reaches the entry EPA publishes as Perfluorooctanoic acid.
Roughly a fifth of the list's entries carry no CAS number at all (EPA ships them under placeholder identifiers). Those entries are still fully searchable by name, and their result says Not assigned on this list where the CAS would go rather than leaving the field silently blank.
Three verdicts are distinct and are never collapsed into each other:
- Listed— the substance's own CAS number appears on the reference list. EPA's preferred name and molecular formula are shown.
- Name-level match — the entry matched by name on a row that carries no CAS number matching this substance. Identity is name-level; read the entry.
- Not found— the substance is absent from this dated copy. Because the list is EPA's explicitly non-exhaustive reference subset of a structural definition, this verdict always carries that caveat: absence is not evidence that a substance is not a PFAS or is not reportable.
The result states exactly which dated copy of the list was used and links the official EPA source. The list and the underlying rule both change — EPA is always authoritative.
Worked example
Searching 335-67-1 returns Listed for EPA's entry Perfluorooctanoic acid (PFOA), molecular formula C8HF15O2. Searching the name Perfluorooctanoic acid reaches the identical entry — one identity, two routes in.
Searching 2H-Perfluorononanoic acid returns a Name-level match: EPA lists the substance with molecular formula C9H2F16O2 but assigns it no CAS number, so the CAS line reads Not assigned on this list. The dropdown flags the same thing before you click, as No CAS on this list.
Searching 58-93-5 (hydrochlorothiazide) returns Not found — with the non-exhaustive caveat attached, because that is what this list's absence actually means. The same substance is on the California Proposition 65 list; a miss here says nothing about any other list.
Searching a checksum-valid CAS number that appears in none of the reference data returns a real Not-found verdict carrying an identity unverified badge: the number is well formed, but nothing in the data confirms what substance it is.
Sources
TSCA §8(a)(7) PFAS reference list (CompTox list PFAS8a7v3)
U.S. Environmental Protection Agency, EPA CompTox list PFAS8a7v3, exported 2026-08-01
40 CFR part 705
PFAS reference data: U.S. EPA CompTox Chemicals Dashboard (public domain).
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Related tools
Data vintage
- Data: EPA TSCA §8(a)(7) PFAS reference list, U.S. Environmental Protection Agency exported 2026-08-01, retrieved 2026-08-01, 13,054 rows.EPA's required framing for this list, verbatim: "This list is EPA's explicitly non-exhaustive reference subset of a broader structural definition of PFAS, and it excludes polymers and UVCBs that may still be reportable. Absence from this list does not mean the substance is not a PFAS or is not reportable." 2,513 rows carry no CAS.
last updated 2026-08-08