Final PFAS Drinking Water Regulation
EPA released the final National Primary drinking water regulation for six PFAS on April 10, 2024. The rule establishes individual maximum contaminant levels (MCLs) for five PFAS and a hazard index MCL for a mixture of four PFAS. For more information on the new PFAS drinking water rule, see EPA's web page:
https://www.epa.gov/sdwa/and-polyfluoroalkyl-substances-pfas.
Oregon Drinking Water Health Advisory Levels for PFAS
OHA has established drinking water health advisory levels (HALs) for four PFAS compounds most commonly found in humans. Sensitive populations are advised not to drink the water if above these levels.
PFAS Compound
|
Oregon Drinking Water Health Advisory Levels (HALs)* parts per trillion (ppt) or nanograms per liter (ng/L)
|
PFOS
| 30 ppt
|
PFOA
| 30 ppt
|
PFNA
| 30 ppt
|
PFHxS
| 30 ppt
|
*Because these chemicals may have cumulative health effects, OHA will also calculate the sum of detections of the four PFAS chemicals with HALs in the table above. The HAL is exceeded when any of these four PFAS chemicals with results showing detections exceeds 30 ppt, or when the sum of these four PFAS chemicals with results showing detections exceeds 30 ppt. PFAS chemicals with a HAL that are not detected and other PFAS chemicals that do not have a HAL would not be included in the calculation.
Oregon’s drinking water PFAS HALs are non-regulatory and do not mandate a required action; rather they provide information on health risks of certain PFAS compounds so that drinking water system operators and health officials can take the appropriate steps to protect drinking water consumers. OHA's expectation is that public water systems will notify their customers if a health advisory level is exceeded.