EPA is releasing draft toxicity assessments for GenX chemicals and PFBS. Following closure of this 60-day public comment period, the EPA will consider the comments, revise the draft documents, as appropriate, and then publish final toxicity assessments. Provided are the complete set of documents.
You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.- Fact Sheet: Draft Toxicity Assessment for GenX Chemicals and PFBS (PDF)(6 pp, 572 K, November 2018, Version 1)
- Technical Fact Sheet: Draft Toxicity Assessments for GenX Chemicals and PFBS (PDF)(9 pp, 745 K, December 2018)
- Prepublication Federal Register Notice: Request for Public Review and Comment: Draft Human Health Toxicity Assessments for Hexafluoropropylene Oxide Dimer Acid and its Ammonium Salt (GenX Chemicals) and for Perfluorobutane Sulfonic Acid (PFBS) and Related (PDF)(9 pp, 269 K, November 14, 2018)
- Draft Toxicity Assessment: Human Health Toxicity Values for Hexafluoropropylene Oxide (HFPO) Dimer Acid and Its Ammonium Salt (CASRN 13252-13-6 and CASRN 62037-80-3) Also Known as “GenX Chemicals” (PDF)(209 pp, 3 MB, November 2018)
- Draft Toxicity Assessment: Human Health Toxicity Values for Perfluorobutane Sulfonic Acid (CASRN 375-73-5) and Related Compound Potassium Perfluorobutane Sulfonate (CASRN 29420-49-3) (PDF)(151 pp, 6 MB, November 2018)
- Response to Peer Review Comments: Draft Human Health Toxicity Values for Hexafluoropropylene Oxide (HFPO) Dimer Acid and Its Ammonium Salt (CASRN 13252-13-6 and CASRN 62037- 80-3) Also Known as “GenX Chemicals" (PDF)(66 pp, 574 K, N)
- Response to Peer Review Comments: Draft Human Health Toxicity Values for Perfluorobutane Sulfonic Acid (CASRN 375-73-5) and Related Compound Potassium Perfluorobutane Sulfonate (CASRN 29420-49-3) (PDF)(68 pp, 576 K, November 2018)