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

Operator error leads to nearly 10,000 gallons of sanitary sewage spilling into Milwaukee's Lincoln Creek Tuesday. The Metropolitan Milwaukee

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."