I'm not exactly sure. My levels of PFOS was the highest, that's "Scotchgard". The house I live in has a very expensive reverse osmosis water filter on the tap

I'm not exactly sure. My levels of PFOS was the highest, that's "Scotchgard". The house I live in has a very expensive reverse osmosis water filter on the tap so I don't think it's that. I eat a ton of fish (like everyday) and recently read they are a significant source of PFOS exposure: https://pubmed.ncbi.nlm.nih.gov/36584847/ https://pubmed.ncbi.nlm.nih.gov/36584847/ Some of the limitations of the test are you can't tell if this is past or ongoing exposure. Hence my desire to investigate phlebotomy. PFOS has a half life of ~2.7 years so it could have been there for a while. Source: https://oem.bmj.com/content/75/1/46 https://oem.bmj.com/content/75/1/46