Mysterious Substance Identified in the Potomac River

BALTIMORE (WJZ)-- The Environmental Protection Agency has determined the source of an oily substance that leaked into the Potomac River November 27.

NRG Energy, which operates a power plant in Dickerson, Maryland was identified to be the source of the leak.

The oily substance has never been observed at or near the WSSC's Potomac River intake.  WSSC's Potomac plant continues to operate at full capacity and the Commission has not experienced any problems to its drinking water quality.

The Potomac Water Filtration Plant produces approximately 70 percent of WSSC's treated water each day for customers across Montgomery and Prince George's counties. The Patuxent Water Filtration Plant supplies the remainder to WSSC's customers.

Follow @CBSBaltimore on Twitter and like WJZ-TV | CBS Baltimore on Facebook