ANN ARBOR – An estimated 1,375,000 gallons of partially treated wastewater was discharged into the Huron River around 11 a.m. on Tuesday.
In a notice, the City of Ann Arbor said Wastewater Treatment Plant staff discovered that wastewater had gone into the river via an outfall during a system shutdown around 1:30 p.m.
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The shutdown was initiated to protect plant equipment when water levels in the ultraviolet disinfection channels were low, which was caused by maintenance.
Officials said the wastewater “received all treatment except disinfection,” and the outflow was closed and water levels restored by 2:05 p.m.
Additional alarms are being investigated by water treatment plant staff should a similar incident happen in the future.
The Washtenaw County Health Department and Michigan Department of Environment, Great Lakes and Energy (EGLE) were notified about the incident.