A sanitary-sewer overflow was reported earlier this week in Constantine Township.
The incident occurred at 10:40 a.m. Tuesday, when a malfunctioning air-release valve caused the overflow along U.S. 131, between Withers and Garber roads.
Once the release stopped, the area was vectored of visible liquid and debris by a contractor, and covered with hydrated lime as a precautionary measure.
No raw sewage was discharged to surface water.
Three Rivers Waste Water Treatment Plant staff made the required notifications to Michigan Department of Environmental Quality and the Branch-Hillsdale-St. Joseph County Health Department.