May 19, 2020 - At approximately 5:30 a.m. on Tuesday, May 19, 2020, staff at the City of Ann Arbor Wastewater Treatment Plant discovered an overflow of partially treated wastewater from the equalization and retention building. The partially treated wastewater, which received settling and chlorine disinfection, flowed directly into the Huron River via an overflow outfall. Plant staff worked diligently to remedy the issue by 10:15 a.m.
At the time of this event, the flow into the plant was nearly triple the normal amount due to the significant rainfall that occurred in the vicinity over the past two days. The total discharge of partially treated wastewater into the Huron River over the five-hour event is estimated to be 600–1,500 gallons. During this same timeframe, the flow in the Huron River was approximately 437,580,000 gallons.
In accordance with regulatory protocols, City of Ann Arbor staff has notified the Washtenaw County Health Department and Michigan Department of Environment, Great Lakes and Energy.
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Wastewater Treatment Services Unit Manager
734.794.6450 ext. 43821
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