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North Dakota is now producing 1 million barrels of oil per day, the state’s Department of Mineral Resources said Tuesday.

Production figures showed April output at record levels.

In March, North Dakota produced 977,000 barrels per day.

Bakken and the Three Forks formation below it account for nearly all of North Dakota’s oil production.

Lynn Helms, director of the state’s Department of Mineral Resources, said only Texas, Alaska and California have also reached a million-barrel-a-day production.