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Roseville briefed on state manganese advisory; local monitoring shows no detections
Summary
City staff told the commission that while the State Water Resources Control Board and OEHHA revised manganese notification and response levels, Roseville's compliance monitoring has produced non-detect results since 2012 and staff do not anticipate immediate operational changes.
Utilities relations administrator Noel Malach and Environmental Utility Operations Superintendent Steven Peterson briefed the commission on state-level activity around manganese in drinking water and what it could mean for Roseville.
Malach summarized the state timeline: the division of drinking water and OEHHA have been reassessing manganese advisories since 2022, and the division recently finalized revised notification and response levels and asked OEHHA to set a public health goal. "The public health goal... is not a drinking water standard in the sense of, for enforcement. It is just an advisory," Malach said.
Peterson reviewed Roseville's local monitoring record: the city has monitored to the California secondary MCL of 50 parts per billion since 2006 and compliance monitoring results have been nondetect since 2012. "We have not found any manganese in any source at that point," Peterson said, and staff reported no anticipated operational changes. He noted green-sand filters remain installed and permitted at two new-well sites but are currently bypassed because monitoring of the city's sources has not shown manganese at the sampled depths.
Commissioners asked about lab procedures and sample origins; staff said certified contract labs perform analyses and that the city has 30 days to notify governing bodies if a result exceeds the notification level.
