News Article

Archived News Release: July 1, 2021 - ​ANN ARBOR, Michigan, July 1, 2021 —Late on the afternoon on Tuesday, June 29, 2021, City of Ann Arbor Public Works Staff were completing a post-rainstorm damage inspection of city-owned infrastructure in a wooded area just east of Hogback Road and located a sanitary manhole that had evidence of a recent sewage overflow. No evidence was found to indicate that any sewage reached any watercourse or storm sewer. It is estimated that 25,000 gallons of sewage was released to the ground surface.

City staff removed debris from the affected area and the manhole cover was placed back on the structure rim. 

Upon review of the rain data from the storm event that occurred over June 25 and 26, 2021, staff engineers determined that there were several isolated areas just upstream of this sewer overflow that received rainfall of a duration and intensity equivalent to a 1% chance rainfall event (commonly known as a 100-year storm event). 

In accordance with regulatory protocols, City of Ann Arbor staff notified the Michigan Department of Environment, Great Lakes and Energy.  ​

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