A sewage overflow estimated at 50,000 gallons was released into Miller Run in west Catonsville, and officials have advised people avoid contact with the waste water.
Baltimore County's public works department responded to the sanitary sewer overflow Monday morning. A resident discovered the sewage, which overflowed from a manhole in a right-of-way south of Baltimore National Pike and north of Quilting Bee Road.
The overflow was undetected for about seven days; after cleaning roots obstructing the line, the department stopped the overflow at 10 a.m., officials said.
Miller Run is a tributary of the Patapsco River. The crew limed the area, officials said, but people should avoid contact with the waste water.
The county's health department will monitor the run's water quality and will publish its results and issue advisories, if necessary, on its website.