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Town hall reviews manganese testing, health guidelines and history of local readings
Summary
Presenters reviewed Department of Health guidance (100 µg/L for infants; 300 µg/L for adults) and a testing history showing well results ranging from roughly 795 µg/L (2003) to 1,070 µg/L (2016) and 983 µg/L in 2024; staff said the Department of Health had told the city the water was safe to consume in prior visits.
Presenters at the town hall summarized the public-health context for manganese in drinking water, reviewed testing history and explained how guidance applies to infants and adults.
A Presenter outlined the guidance history and age-based recommendations, saying the Department of Health uses about 100 micrograms per liter for infants and 300 micrograms per liter for older children and adults. "Back in 2012... that's your current 100 micrograms for infants and 300 micrograms per liter for older children and adults," the Presenter said while describing the guidance timeline.
The meeting included a chronology of local well test results presented by the Presenter: 2003 — 795 µg/L; 2011 — 926 µg/L; 2013 — 995 µg/L; 2016 — 1,070 µg/L; 2020 — 990 µg/L; 2024 — 983 µg/L. Presenters clarified those values were measured at the well and discussed the Department of Health's prior in-person presentation in 2021 about exposure context. A resident raised a question about the 2020 notice and whether water had been declared unsafe; staff said the notice informed the city of elevated manganese but did not represent a formal declaration that water was unsafe to drink.
The presenter and utility staff also described how the Department of Health prescribes a sampling schedule and said the city performs some in-house testing (iron monthly) while following state schedules for other parameters.
