The Arlington County Fire Department and the county’s Department of Environmental Services (DES) were called to Four Mile Run near Shirlington this morning for a report of a huge mass of foam accumulating in the creek.

It’s thought that the foam was caused by some sort of soap or detergent. Firefighters tested the foam using a chemical strip and determined that it was not hazardous, according to DES Office of Sustainability and Environmental Management Bureau Chief Jeff Harn. DES is now trying to figure out where the foam came from.

“County staff continue to investigate the issue and are trying to determine the source of the foam,” Harn told ARLnow.com. “However, the discharge that caused the foam is no longer occurring and no source has yet been identified.”

Courtesy photo