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Lake Arrowhead district reports PFOA at 7.3 ppt, advances treatment plant designs
Summary
Operations Manager Matt Brooks told the board that a Bernina blended sample on April 17 showed PFOA at 7.3 parts per trillion (average 7.2 ppt), below California's 10 ppt response level; the district received 90% designs from N2W and is coordinating with state regulators toward final designs.
The Lake Arrowhead Community Services District reported progress on efforts to address per- and polyfluoroalkyl substances (PFAS) during its May 27 board meeting.
Operations Manager Matt Brooks told the board that a Bernina blended sample taken April 17 showed PFOA at 7.3 parts per trillion and an average concentration of 7.2 ppt, both below California’s response level of 10 ppt. He said additional raw-water samples from treatment plants and the top three producing wells were collected about a week before the meeting and that results would be available by the next meeting.
Brooks said the district has received 90% design plans from engineering firm N2W for treatment plants serving Cedar Glen and Bernina and described a May 21 discussion on design feedback. He said staff is scheduling a follow-up meeting with the Division of Drinking Water to finalize comments and move to 100% design.
Brooks summarized federal developments affecting local planning: the Environmental Protection Agency retains a maximum contaminant level (MCL) of 4 ppt for PFOA and PFOS and is considering extending compliance deadlines from 2029 to 2031. "That potential extension doesn't change the District's goal of 2029," he said, noting the District will continue moving toward treatment and design milestones.
The board did not take formal action on the PFAS designs at the meeting; Brooks advised that further regulatory coordination and final design approval steps remain.
