NMeFOSAA

What is NMeFOSAA?

N-methyl perfluorooctanesulfonamidoacetic acid, or NMeFOSAA, is a man-made chemical that belongs to the PFAS family, a group of thousands of synthetic chemicals often called "forever chemicals" because they break down very slowly in the environment and in the human body. NMeFOSAA is classified as a "precursor" PFAS, meaning it can transform into other harmful PFAS compounds — including PFOS — over time. Like other PFAS, it can build up in water, soil, and living things.

Where does it come from?

NMeFOSAA has been used in industrial processes and in the making of consumer products that resist water, grease, and stains. It can be found in sources connected to stain-resistant fabrics and carpets, food packaging coatings, and certain industrial chemicals used in manufacturing. It has also been associated with the use of aqueous film-forming foam (AFFF), a type of firefighting foam used at military bases and airports.

Health concerns

Research on NMeFOSAA specifically is limited, and scientists are still working to understand its full effects on human health. Because it can convert into PFOS in the body and environment, some researchers look to PFOS studies for guidance — PFOS has been associated in studies with thyroid disruption, immune system effects, and developmental problems in children. These findings come largely from animal studies and limited human data, so the evidence is not yet conclusive. If you have health concerns related to chemical exposure, consult a healthcare provider.

EPA standard

The EPA has not established a Maximum Contaminant Level (MCL) — a legal limit for how much of a chemical is allowed in drinking water — for NMeFOSAA. This means public water systems are not currently required to test for or limit this compound. The absence of a federal limit does not mean the chemical is considered safe.

What you can do

If NMeFOSAA is detected in your water, consider using a certified reverse osmosis filter or a granular activated carbon (GAC) filter, both of which research studies suggest can reduce PFAS levels in drinking water. Boiling water does not remove PFAS and may actually concentrate them. Contact your local water utility for testing information and consult a healthcare provider if you are concerned about past exposure.