Largest oil spills affecting U.S. waters 1969-2024
The largest oil spill affecting U.S. waters since 1969 is the Deepwater Horizon spill. On April 20, 2010, an explosion on the BP-operated Deepwater Horizon drilling platform caused some 134 million gallons, or 3.2 million barrels, of oil to spill into the Gulf of Mexico until the well was eventually declared sealed on September 19, 2010. This event is also the largest marine oil spill in history.