A subsidiary of Aleut Corp. will pay a $500,000 civil fine and another $200,000 for compliance measures for violating its oil discharge and prevention plan five years ago.
The Alaska Department of Law announced the settlement Tuesday with Aleut Enterprise LLC.
Aleut Enterprise manages fueling facilities in Adak and Cold Bay and manages the port of Adak, according to its website.
State prosecutors say the company on Jan. 11, 2010, released about 1,126 barrels of fuel, or 35,469 gallons, into state waters.
The fuel was being transferred from a tanker at the loading dock and overfilled a tank.
The fuel entered Helmet Creek, which flows into Sweeper Cove, a small boat harbor in the port of Adak.
The company's operations manager pleaded guilty to two criminal counts.