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Division of Drinking Water proposes lower manganese advisory thresholds tied to existing secondary standard
Summary
The Division of Drinking Water proposed Oct. 7 to set the manganese non‑regulatory notification level equal to California’s existing secondary MCL (0.05 mg/L) and to set a single‑sample response level at 0.20 mg/L to prompt rapid confirmation and action.
Sacramento — The Division of Drinking Water (DDW) proposed revisions to the state’s non‑regulatory manganese notification and response levels at a State Water Resources Control Board briefing on Oct. 7. The division proposed aligning the lower “notification level” with California’s enforceable secondary maximum contaminant level (MCL) for manganese (0.05 mg/L) and setting the response level — the single‑sample level that triggers immediate action — at 0.20 mg/L.
Officials said the aim is clearer, health‑oriented messaging and faster follow‑up where manganese presents a risk to infants and other vulnerable groups. DDW staff noted that young children retain and absorb more manganese and that health guidance differs between infants and adults.
Key points - Proposed thresholds: DDW proposes the notification level be the running annual average of 0.05 mg/L (the…
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