Perfluorooctane Sulfonate (PFOS)
CAS Number
1763-23-1Synonym
1-Octanesulfonic acid, 1-Perfluorooctanesulfonic acid; Heptadecafluoro-1-octanesulfonic acid; Perfluoro-n-octanesulfonic acid; Perfluoroctanesulfonic acid; Perfluoroctylsulfonic acid
Occurrence/Use
Used in surface protection products such as carpet and clothing treatments and coating for paper and cardboard packaging. They have also been used in fire-fighting foams.
Cancer Potency Information
| Latest Criteria: | California Public Health Goals |
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Proposition 65
Chemical Status
| Cancer: | Currently listed |
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| Reproductive Toxicity : | Currently listed |
Cancer
| Listed as causing : | Listed as causing: Cancer |
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| Date of Listing: |
Reproductive Toxicity
| Listed as causing: | Developmental Toxicity | Developmental Toxicity |
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| Date of Listing: | |
| Basis for Listing : | Authoritative Bodies-US Environmental Protection Agency |
Documents, Presentations, and Publications
| Cancer: |
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Comments
Public notices related to this chemical
- Notice to Interested Parties Chemicals Listed Effective December 24, 2021 As Known to the State of California to Cause Cancer: Perfluorooctane Sulfonic Acid (PFOS) and Its Salts and Transformation and Degradation Precursors
- Announcement of the Carcinogen Identification Committee Meeting Scheduled for December 6, 2021; Notice of Availability of Hazard Identification Materials for Perfluorooctane Sulfonic Acid (PFOS) and Its Salts and Transformation and Degradation Precursors
- Chemicals Listed Effective November 10, 2017 as Known to the State of California to Cause Reproductive Toxicity: Perfluorooctanoic Acid (PFOA) and Perfluorooctane Sulfonate (PFOS)
- Notice of Intent to List Perfluorooctanoic Acid (PFOA) and Perfluorooctane Sulfonate (PFOS)
Water
California Public Health Goals Data
| Public Health Goal (mg/L): | 0.000001 |
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| Public Health Goal - Download: | pfoapfosphgfinaldraft040524.pdf |
| Notification Level (μg/L): | 0.0065 (Because OEHHA’s reference levels for cancer are below the limit of quantitation of current analytical methods, OEHHA recommended the Board set the notification levels at the lowest levels that can be reliably detected using available technologies) |
| Notification Level - Download: | final-pfoa-pfosnl082119.pdf |
Perfluorooctane sulfonic acid (PFOS) was added to the Proposition 65 list as part of the listing of "PFOS and its salts and transformation and degradation precursors" as causing cancer. For more information, see Perfluorooctane Sulfonic Acid (PFOS) and Its Salts and Transformation and Degradation Precursors.