Tag Archives: PFOA

Parts Per Trillion, We Hardly Knew Ye; Sell Hello to Parts Per Quadrillion

Just when we environmental old-timers were just getting used to talk about PFAS concentrations in the low parts per trillion range, EPA has moved us squarely into uncharted territory.  EPA has released new, interim, lifetime drinking water health advisories of 4 parts per quadrillion for PFOA and 20 parts per quadrillion for PFOS.  I’ll just note a couple of points: 

  • I think it sort of charming that EPA still states the health advisories in the units of parts per trillion (0.004 ppt for PFOA and 0.020 ppt for PFOS,…
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More Action By EPA on PFAS; The Bad News Keeps Piling Up.

The news about PFAS keeps piling up, and the trend is pretty clear – none of it is good for manufacturers and significant users.  There were two important items this week.

First, EPA published its human health toxicity assessment for “GenX chemicals,” also known as hexafluoropropylene oxide (“HFPO”) dimer acid (and don’t forget its ammonium salt!).  EPA has pegged HFPO’s toxicity at 7-100 times higher than that of other PFAS compounds for which assessments already exist,… More

Just In Case You Wondered Whether PFAS Are Really a Big Deal

If you were thinking that PFAS were important, but you’ve been unsure just how big a deal they are, you need look no further than the Statewide PFAS Directive issued by the New Jersey Department of Environmental Protection.  Some of my colleagues in New Jersey may correct me, but I think that the Directive may be the most wide-ranging order I’ve ever seen issued by an environmental agency. … More