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Wausau commission sets 4 ppt trigger for PFAS carbon change-outs, directs staff flexibility on timing
Summary
The commission accepted staff recommendations to operate the granular-activated carbon (GAC) system toward a 4 parts-per-trillion trigger for PFOA/PFOS to guide future change-outs and to collect operational data, while allowing staff latitude on exact timing and logistics.
The Water Works Commission on Tuesday accepted staff recommendations to use 4 parts per trillion (ppt) for PFOA and PFOS as the operational trigger for planning granular-activated carbon (GAC) change-outs and to give staff flexibility on timing to collect data and stage replacements economically.
Scott, the water operations supervisor, summarized regulatory context: the U.S. Environmental Protection Agency has proposed a 4 ppt level for PFOA and PFOS, and state agencies currently reference higher numeric levels in certain contexts. Scott told commissioners the commission's GAC lead-lag…
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