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They are referring to crossing these thresholds (from Fed 87-118): > EPA’s health advisories, which identify the concentration of chemicals in drinking water a
by formerly_proven 4y ago
They are referring to crossing these thresholds (from Fed 87-118):
> EPA’s health advisories, which identify the
concentration of chemicals in drinking
water at or below which adverse health
effects are not anticipated to occur, are:
0.004 parts per trillion (ppt) for PFOA,
0.02 ppt for PFOS, 10 ppt for GenX
chemicals, and 2,000 ppt for PFBS.
Health advisories are non-regulatory
and reflect EPA’s assessment of the best
available peer-reviewed science.
0.004 ppt is also more commonly known as the number zero. It's probably just the currently best limit of detection for PFOA in water.