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How Low Will The Regulators Go: California Sets New PFOA/PFOS Drinking Water Notification Guidelines

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Water

By Steven M. Siros

On August 23, 2019, California’s State Water Resources Control Board (Water Board) announced updated guidelines for local water agencies with respect to perfluorooactanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS) in drinking water. The updated guidelines lower the notification levels from 14 parts per trillion (ppt) to 5.1 ppt for PFOA and from 13 ppt to 6.5 ppt for PFOS. Public water supply systems are required to report exceedances of these guidelines to their governing boards and the Water Board.

According to the Water Board, these new guidelines were predicated on updated health recommendations issued by California’s Office of Environmental Health Hazard Assessment (OEHHA), which published its own recommended notification levels for PFOA and PFOS, albeit at much lower levels. In a recently issued report, OEHHA recommended that the notification levels be set at 0.1 ppt for PFOA and 0.4 ppt for PFOS. However, OEHHA recognized that these levels are lower than what can reasonably be detected in the laboratory and therefore recommended that the Water Board set the notification levels at the lowest reliable detection levels. 

In addition to the updated notification levels, the Water Board requested that OEHHA proceed to develop public health goals for both PFOA and PFOS, which is the next step in the process of establishing maximum contaminant levels for these contaminants in drinking water.  We will continue to monitor and provide updates with respect to these regulatory efforts.