What share of responsibility did the court assign to BP for the Deepwater Horizon spill?

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Fireboats battle a blaze on the Deepwater Horizon drilling rig in the Gulf of Mexico, April 2010. — Deepwater Horizon oil spill Fireboat response crews attempt to extinguish the blaze aboard the Deepwater Horizon oil rig in the Gulf of Mexico, April 21, 2010.

In the civil trial regarding the 2010 Deepwater Horizon oil spill, the court assigned BP 67 percent of the responsibility for the disaster.1

In its September 2014 ruling, the court determined that BP’s actions constituted "gross negligence," a designation that resulted in significantly higher fines compared to those for simple negligence. The remaining liability was divided between the other involved companies: Transocean was held 30 percent liable, and Halliburton was held 3 percent liable, with both companies deemed negligent.1