The pipeline, built by Energy East, was built to carry Canadian oil sands crude from Alberta to refineries on the Gulf Coast.
It was supposed to be complete in 2018, but has since been delayed by environmental concerns, including over spills from the dredging machinery that were to be installed in the Gulf of Mexico.
In July 2018, the company revealed the massive spill had occurred.
By the time the pipe was finally fully repaired in 2019, the oil was still leaking.
Now the spill is back on the front burner as Prime Minister Justin Trudeau’s government considers whether to approve the $7.4-billion Keystone XL project.
The spill is one of the largest environmental disasters in Canadian history, with 1,000 workers and millions of litres of oil spilling into the Gulf and surrounding waters.
The federal government says it will not approve the project until the oil has been cleaned up.
On Wednesday, Environment Minister Catherine McKenna said the federal government is “very aware” of the pipeline spill.
“We will have a look at the spill as soon as possible and look at it from a spill-prevention perspective,” she told reporters at a news conference in Ottawa.
In June, Environment Canada said a section of the pipe that was to be tested by the pipeline’s operator was leaking oil.
The Canadian Press/Radio-Canada reported the section of pipe that leaked was in an area with no oil in it.
The company said the pipeline operator and its subcontractor will not be liable for the spill.
The pipeline operator said Wednesday it was not responsible for the damage to the pipe.
“There is no damage to any of the pipes,” spokesman Scott McIntosh told reporters.
McKenna said it was important to know the cause of the leak and the extent of the damage.
The government says the spill was caused by a faulty part, and said the government was investigating.
The Environmental Protection Agency has also been investigating, saying it’s working with industry and local authorities to identify and address the root causes of the spill and the safety of the environment.