DDW Proposes NL and RL for PFHxS

In March 2022, the California Office of Environmental Health Hazard Assessment (OEHHA) published a recommended Notification Level (NL) and Response Level (RL) for perfluorohexane sulfonic acid (PFHxS).

July 7, 2022, the State Water Resources Control Board (SWRCB) Division of Drinking Water (DDW) released the enclosed notice that they are proposing OEHHA’s recommended NL and RL, presented below:

Proposed NL: 2 parts per trillion (ppt)
Proposed RL: 20 ppt

The enclosed notice includes a link to the supporting documentation for the proposed NL and RL. The enclosed notice indicates that DDW will present the proposed PFHxS NL and RL as an informational item at the August 16, 2022 meeting of the SWRCB. At the present time, the Agenda for that meeting has not yet been posted.

(Note: when DDW establishes an (or revises an existing) NL and RL, California Health and Safety Code, Section 116456 requires that (1) DDW publicly propose that the NL and RL are available, (2) provide the supporting documentation, and (3) before the NL and RL are finalized, present the proposed NL and RL at a meeting of the SWRCB).