(WXYZ) – The City of Ann Arbor says more than one million gallons of partially treated sewage has spilled into the Huron River.
According to a city statement, around 1:30 p.m. Tuesday, workers at the City of Ann Arbor sewage treatment plant discovered the discharge due to “low water levels in the ultraviolet disinfection channels.” The low levels are believed to have been caused by maintenance activities.
The city said partially treated sewage that entered the river had received all the treatment, but had not been disinfected by the ultraviolet system. The discharge reportedly began around 11 a.m. Ann Arbor says the total discharge was estimated at 1,375,000 gallons.
After the incident, Ann Arbor said staff shut off flow to the river and managed to restore water levels in the ultraviolet disinfection system. An investigation is underway to determine if notification alarms should be installed to prevent similar incidents.
A spokesperson for the sewage treatment plant said the city has notified state and local officials and they will determine the possible impact and issue alerts or advisories.
7 Action News has contacted the Michigan Department of Environment, Great Lakes and Energy for comment and is awaiting a response.