On February 6, 2020, California’s Water Resources Control Board (WRCB) announced that it would be dropping the response levels (RLs) for perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS) from 70 parts per trillion (ppt) to 10 ppt for PFOA and 40 ppt for PFOS. This announcement comes on the heels of the WRCB’s August 2019 decision to lower the notification levels (NLs) for these compounds to 5.1 ppt for PFOA and 6.5 ppt for PFOS. An exceedance of the NL requires that the drinking water provider notify their governing boards and the WRCB of the exceedance—this notification would need to occur within 30 days of receipt of the validated laboratory results. In the event of an exceedance of the RL, the water provider must either (1) take the source out of service immediately; (2) utilize treatment or blending; or (3) provide public notification of the exceedance within 30 days of receipt of the validated laboratory results.
At the same time, the WRCB has asked California’s Office of Environmental Health Hazard Assessment (OEHHA) to proceed with the development of public health goals for both PFOA and PFOS which is a step in the process of establishing maximum contaminants levels for these contaminants. We will continue to monitor and provide updates with respect to these ongoing regulatory activities.