'Forever chemicals' could be in nearly half of US tap water, federal study finds
Last year the EPA massively tightened its recommendation for PFAS in drinking water from 70ppt to 0.004ppt for PFOA and 0.02 ppt for PFOS[1]. I don't think anyone is enforcing anywhere near that level yet... CA is the strictest in the US at 5.1ppt.<p>The scariest part of this to me is that even if you do manage to get it out of your water at home through filters or reverse osmosis it's probably in all your food at high concentrations. At least as of 2019 in Canada and the EU PFAS levels in retail meat are at 500-700ppt and the US is entirely unknown [2].<p>It's also pretty tough to even figure out what filter setup to use at home since the NSF filter standards are still for the outdated 70ppt metric. Duke did a decent study on actual filters a few years back[3].<p>[1] <a href="https://www.hsph.harvard.edu/news/features/stricter-federal-guidelines-on-forever-chemicals-in-drinking-water-pose-challenges/" rel="nofollow noreferrer">https://www.hsph.harvard.edu/news/features/stricter-federal-...</a><p>[2] <a href="https://www.nal.usda.gov/research-tools/food-safety-research-projects/evaluation-blood-and-tissue-pfas-levels" rel="nofollow noreferrer">https://www.nal.usda.gov/research-tools/food-safety-research...</a><p>[3] <a href="https://pubs.acs.org/doi/suppl/10.1021/acs.estlett.0c00004/suppl_file/ez0c00004_si_001.pdf" rel="nofollow noreferrer">https://pubs.acs.org/doi/suppl/10.1021/acs.estlett.0c00004/s...</a>