“Our mission is to apply the best science, engineering and information available to determine if a proposed project complies with all regulations under our authority,” Clancy said.

The suit was filed by the Earthjustice attorneys on behalf of the Sierra Club, Waterkeeper Alliance, gulf Restoration Network, Atchafalaya Basinkeeper and the Louisiana Crawfish Producers Association-West. The legal action contends the pipeline would have “significant environmental impacts on the human and natural environment of Louisiana.”

The line will carry an estimated 480,000 barrels of crude oil a day.

“It will cross hundreds of streams, rivers, lakes, wetlands, and bayous, where both construction and operation of the project presents significant environmental threats,” the suit said.

A spokeswoman at Energy Transfer Partners said pipelines are heavily regulated by the government and this one is no different than others that meet safety and reliability requirements.

“This project has been in development since 2015 and has been carefully vetted by all applicable regulatory agencies and local governments along its route,” said Alexis Daniel.