Source: Association of State Drinking Water Administrators
Changes in drinking water health advisories for PFAS contaminants
The Environmental Protction Agency adjusts contamination levels in health advisories as understanding of PFAS grows. Health advisories are not legally enforceable, yet reflect the assessment of the health risks of a contaminant.
PFOA
2009
Health advisory level:
Select compound to see changes in health advisories:
Perfluorooctanoic acid
Perfluorooctanesulfonic acid
PFOS
400
parts per trillion
2016
Health advisory level:
70
parts per trillion
(Individual and combined sum with PFOS)
2022 interim health advisory level:
parts per trillion
.004
Perfluorooctanoic acid
PFOA
Perfluorooctanesulfonic acid
PFOS
2009
Health advisory level:
200
parts per trillion
2016
Health advisory level:
(Individual and combined sum with PFOA)
70
parts per trillion
2022 interum health advisory level:
parts per trillion
.02
Perfluorooctanoic acid
PFOA
Perfluorooctane-
sulfonic acid
PFOS
2009
Health advisory level:
200
parts per trillion
2016
Health advisory level:
(Individual and combined sum with PFOA)
70
parts per trillion
2022 interum health advisory level:
parts per trillion
.02