Workers from Veolia Water Milwaukee discharged approximately 9,600 gallons of sanitary sewage from a vacuum truck into a storm sewer that the crew "mistakenly believed was a sanitary sewer."

The Milwaukee Metropolitan Sewerage District said a contractor accidentally released nearly 10,000 gallons of sewage into Lincoln Creek.

The incident occurred when workers from Veolia Water Milwaukee mistakenly released wastewater into a storm sewer rather than the sanitary sewer.