RCW 90.56.380

In addition to any cause of action the state may have to recover necessary expenses for the cleanup of oil pursuant to RCW 90.56.340 and 90.56.330, and except as otherwise provided in RCW 90.56.390, any other person causing the entry of oil shall be directly liable to the state for the necessary expenses of oil cleanup arising from such entry and the state shall have a cause of action to recover from any or all of said persons. Except as otherwise provided in RCW 90.56.390, any person liable for cost of oil cleanup as provided in RCW 90.56.340 and 90.56.330 shall have a cause of action to recover for costs of cleanup from any other person causing the entry of oil into the waters of the state including any amount recoverable by the state as necessary expenses under RCW 90.56.330.