Perfluorohexane sulfonic acid (1-Hexanesulfonic acid, triddecafluoro-) [PFHxS]: federal lists and state cleanup levels
- CAS 355-46-4
- 1 federal list
- 1 state
CAS 355-46-4 is on one of the three federal lists this handbook carries from Title 40 of the Code of Federal Regulations, Parts 300 to 399, revised as of July 1, 2025: the toxic chemicals for release reporting (40 CFR 372.65). That list's rows for it are below as the regulation prints them. CAS 355-46-4 is in the cleanup-level tables of one state in this handbook: Texas (Perfluorohexane sulfonic acid (1-Hexanesulfonic acid, triddecafluoro-) [PFHxS]). Its numbers are below as its agency prints them. A state that lists the substance under another CAS number, or without one, is not shown here.
Federal lists
Toxic chemicals for release reporting (TRI)
- 40 CFR 372.65(d)
- Revised as of July 1, 2025
40 CFR 372.65(d), the per- and polyfluoroalkyl substances among the toxic chemicals subject to release reporting, lists CAS 355-46-4 with an effective date for reporting of 1/1/20.
Table 4 to Paragraph (d): (d) Per- and polyfluoroalkyl substances alphabetical listing.
| Chemical name | CASRN1 | Effective date |
|---|---|---|
| Perfluorohexanesulfonic acid | 355-46-4 | 1/1/20 |
Notes to Table 4 to Paragraph (d): (d) Per- and polyfluoroalkyl substances alphabetical listing., as the regulation prints them
1 CASRN means Chemical Abstracts Service Registry Number.
Texas
- TCEQ
- TRRP Tier 1 PCLs
- February 6, 2025
For Perfluorohexane sulfonic acid (1-Hexanesulfonic acid, triddecafluoro-) [PFHxS], TCEQ's Tier 1 table prints 0.25 mg/kg for TotSoilComb and 0.002 mg/kg for GWSoilIng (residential soil, 0.5 acre source area), and 0.000093 mg/L for GWGWIng (residential groundwater).
- 0.25mg/kg 2.5E-01 TotSoilComb Table 1: Tier 1 Residential Soil PCLs 0.5 acre source area
- 0.002mg/kg 2.0E-03 GWSoilIng Table 1: Tier 1 Residential Soil PCLs 0.5 acre source area
- 0.000093mg/L 9.3E-05 GWGWIng Table 3: Tier 1 Groundwater PCLs - Residential and Commercial/Industrial Residential
All Texas values for Perfluorohexane sulfonic acid (1-Hexanesulfonic acid, triddecafluoro-) [PFHxS]
For the federal lists the regulation governs. This page copies the Code of Federal Regulations' annual edition revised as of July 1, 2025, which is kept up to date by the Federal Register; amendments published there since that date are not shown. This page is a reference copy and not a reporting decision. Check the current regulation before relying on a value.
A list with no section on this page has no row with this CAS number. That alone does not put the substance outside the list: the lists also have entries with no CAS number (broad classes, chemical categories, waste streams), which a page filed by CAS number cannot show.
Each agency's own publication governs: its current table, or the published rule where the agency says so. This page is a reference copy and not a cleanup decision. Check each agency's page before relying on a value.
Source
- Environmental Protection Agency, 40 CFR parts 302, 355 and 372, in Title 40 of the Code of Federal Regulations, Parts 300 to 399, revised as of July 1, 2025, as the U.S. Government Publishing Office posts it. File read October 6, 2026.
- Texas Commission on Environmental Quality, Texas Risk Reduction Program Tier 1 Protective Concentration Levels, last revised February 6, 2025. File read October 1, 2026.