Two companies are paying a $3.3 million civil penalty today to the Department of Environmental Protection.
The funds from Energy Transfer and Atlantic Richfield will be used to clean up an oil discharge along the Allegheny River in Lawrenceville.
The origin of the discharge is the former Standard Oil refinery on land occupied now by properties along Butler Street.
DEP says petroleum and a material resembling tar has leaked into the river for decades.
Energy Transfer owns Sunoco, which owns the property where the refinery stood, and former owner Atlantic Richfield, will remediate the property, excavate and remediate the riverbank and tar deposits and revise a plan to keep the river clean.