WASHINGTON — The Justice Department and five states Monday announced a $20 billion final settlement of environmental damage claims arising from the 2010 Deepwater Horizon oil spill in the Gulf of Mexico.

The deal, once approved by a judge, would resolve all civil claims against BP and end five years of legal fighting over a 134 million-gallon spill that affected 1,300 miles of shoreline. It also would bind the company to a massive cleanup project in the Gulf Coast area aimed at restoring wildlife, habitat and water quality.

“BP is receiving the punishment it deserves, while also providing critical compensation for the injuries that it caused to the environment and the economy of the Gulf region,” Attorney General Loretta Lynch said at a Justice Department news conference.

“The steep penalty should inspire BP and its peers to take every measure necessary to ensure that nothing like this can ever happen again,” Lynch said.

The settlement, filed in federal court in New Orleans, finalizes an agreement first announced in July. The next steps are a 60-day public comment period and court approval.

In a statement, BP spokesman Geoff Morrell said the settlement total announced Monday includes amounts previously spent or disclosed by the company and “resolves the largest litigation liabilities remaining from the tragic accident.”

Among other requirements, BP would have to pay $5.5 billion in Clean Water Act penalties and nearly $5 billion to five Gulf states: Alabama, Florida, Louisiana, Mississippi and Texas. The company would also be required to pay $8.1 billion in natural resource damages, with funds going toward Gulf restoration projects such as support for coastal wetlands, fish and birds.