TSCA Test Order Issued for PFAS NMeFOSE

On March 20, 2024, EPA issued a test order for a PFAS known as NMeFOSE (CASRN 24448-09-7).  The order, issued under section 4(a) of the Toxic Substances Control Act, requires 3M Co. and Wacker Chemical Corp. to conduct tiered testing on NMeFOSE.

NMeFOSE was selected for testing as a representative of a group of similar PFAS.  Although existing information on NMeFOSE was deemed insufficient, EPA “identified hazards for acute toxicity and specific target organ toxicity.”  NMeFOSE is expected to break down into a highly toxic PFAS known as PFOS, which also drove concerns.

In a press release, EPA stated that NMeFOSE “has been used widely in products, including clothing and carpet treatments as well as furniture coatings.”  The press release also noted that NMeFOSE can accumulate and that the PFAS has been found in the air and in biosolids.  No Chemical Data Reporting manufacturing information is available for the substance.

The first round of tests, which focus on physical and chemical properties, are due 365 to 390 days after the order’s effective date of March 25, 2024.  Subsequent testing will include assessments of NMeFOSE’s environmental fate, in vivo health effects, and reproductive toxicity, with specific testing requirements contingent on earlier results.

The order is the fourth issued under EPA’s National PFAS Testing Strategy.  The most recent prior order was for HFPO-DAF in August 2023.