Lieutenant John Edwards, spokesman for the US Coast Guard, said on Saturday that the Clean Gulf Associates, a nonprofit oil-spill response cooperative, has placed a containment boom in the area to prevent the further spread of the oil.
The spill, which is ongoing, appears to be coming from a source underwater at an offshore drilling lease about 2 miles (3km) south of Port Fourchon in Louisiana, an oil and gas hub.
So far, the growing spill appears to have remained out to sea and has not affected the Louisiana shoreline.
There is no estimate yet for how much oil was in the water, but recent satellite images reviewed by The Associated Press news agency on Saturday appeared to show the slick drifting more than 12 miles (19km) eastward along the gulf coast.
Edwards said response teams are monitoring reports and satellite imagery to determine the scope of the discharge.
He said the source of the pollution is located in Bay Marchand, Block 4, and is believed to be crude oil from an undersea pipeline owned by Talos Energy.
Brian L Grove, spokesman for the Houston-based energy company, said it had hired Clean Gulf Associates to respond to the spill even though the company believes it is not responsible for the oil in the water.
Talos will also dispatch a team of divers to determine the source of the spill on Sunday.
“Talos will continue to work closely with the US Coast Guard and other state and federal agencies to identify the source of the release and coordinate a successful response,” the company said in a statement. “The company’s top priorities are the safety of all personnel and the protection of the public and environment.”
Once the source had been identified, the coastguard said it will work on a recovery and source control plan.
The Bay Marchand spill is one of the dozens of reported environmental hazards that regulators are responding to in Louisiana and the gulf following Hurricane Ida.
It made landfall in Louisiana last Sunday, destroying entire communities.