In the US, levels of some of them have declined significantly (following restrictions on manufacturing). https://www.atsdr.cdc.gov/pfas/health-effects/us-popul

In the US, levels of some of them have declined significantly (following restrictions on manufacturing). https://www.atsdr.cdc.gov/pfas/health-effects/us-population.html https://www.atsdr.cdc.gov/pfas/health-effects/us-population.... Note that there's 3 categories in the data there, occupational exposure, exposed communities and then the US general population. There's large declines in all 3 groups.