An estimated 72,000 gallons of sewage spilled from a damaged pipe in White Marsh, according to the Baltimore County Department of Public Works.
Officials say erosion caused concrete pipe lining to slip and damage a 12-inch-diameter sewer pipe near Cordon Way in the area of White Marsh Mall. The sewage spilled into a tributary of White Marsh Run.
The spill was reported to the county at 12:46 p.m. Thursday and a public works crew had it stopped by 3:50 p.m. The crew replaced 17 feet of the sewer pipe.
While the spill was reported to the county Thursday, it likely started June 19 when it was reported to the Maryland Department of the Environment, said David Fidler, a county spokesman. The county wasn't notified until Thursday, he said.
MDE spokesman Mark Shaffer said his agency is investigating what happened.
In the county, sewage spills can be reported by calling 410-887-5210 or 911, Fidler said.
Health officials always caution people to stay away from waterways where there have been sewage spills. The county's Department of Health, however, has not issued any no-contact advisories for this tributary, which is not in an area used for swimming or boating.