An oil refinery in the U.S. Virgin Islands that contaminated the environment in a series of events that forced schools to close and sickened dozens of residents announced Monday that it would remain shuttered indefinitely.

Limetree Bay Energy said it would lay off more than 270 workers by September because it faced “severe financial constraints” after the U.S. Environmental Protection Agency suspended its petroleum refining and processing operations last month.

“This was an extremely difficult decision for us,” CEO Jeff Rinker said in a statement. “Unfortunately, this is our only option.”

The EPA paused the company’s operations last month as part of a 60-day emergency order after noting that Limetree had significant air pollutant and oil releases since February. The incidents, which the agency called “totally unacceptable,” include exceeding the emissions limit of sulfur dioxide, which can harm a person’s respiratory system.

“Each had an immediate and significant health impact on people and their property,” the EPA said.

The announcement of the indefinite closure comes a month after a group of people filed a class action suit accusing Limetree of routinely emitting dangerous airborne chemicals. Judith Enck, a former EPA regional administrator, said in a phone interview that the contamination led to the hospitalization of dozens of people, the temporary closure of schools and even forced a COVID-19 vaccine site to shut down for a day.

“Limetree caused tremendous damage on St. Croix,” she said, adding that while people can breathe easier for now, much work remains. “There is a legacy of toxic contamination at the property that needs to be cleaned up.”

Enck said it would take decades to do so: “This is probably going to be a long, drawn-out fight over hundreds of millions of dollars. This cleanup is not going to be cheap.”

The oil refinery is based on the island of St. Croix, home to more than 50,000 people. Its previous owner was Hovensa LLC, a joint venture of New York-based Hess Corp. and Petroleos de Venezuela SA. At the time, the refinery was among the 10 largest in the world and also struggled with polluting events, paying a $5.4 million penalty one year for violating the Clean Air Act.

In 2012, Hovensa LLC announced it was closing the refinery in a hit to the tiny island given that some 2,000 people worked there. It was the U.S. territory’s largest private employer and generated some $60 million a year in revenue for the government.

The complex kept operating solely as an oil storage terminal for nearly a decade until Limetree restarted the refinery in February of this year, announcing it was capable of processing some 200,000 barrels a day. Limetree, which is now run by EIG Global Energy Partners, had bought the terminal and refinery in 2016 for $190 million.