Enbridge breaches aquifer along Line 5 reroute path

An aquifer breach has occurred in northern Wisconsin, along the reroute path of the Enbridge Line 5 oil and gas pipeline. In a statement, Enbridge spokesperson Juli Kellner said that “a flow of water was observed following the direct installation of pipe beneath the Marengo River.”

Kellner said that Enbridge is working with the Department of Natural Resources “and other engineering and environmental specialists to determine next steps.” The breach was first reported by Northern News Now.

It’s unclear how much water was released due to the breach. The DNR didn’t respond to requests for comment. 

In August, a section of Line 5 released more than 1.3 million gallons of natural gas liquid after an unoccupied truck rolled and damaged the pipeline. WPR reported that the leak was the largest of its kind for both Enbridge and the state of Wisconsin. 

Enbridge previously  breached an aquifer while building the Line 3 pipeline in Minnesota. The breach led to an uncontrolled release of hundreds of millions of gallons of groundwater. Minnesota’s attorney general filed charges against the company in that case. 

Line 5 is a decades-old pipeline that carries up to 23 million gallons of crude oil and natural gas liquids daily from Ontario to the southern Unites States. In 2019, the Bad River Band of Lake Superior Chippewa sued Enbridge to shut the pipeline down and to expel the Canadian-owned company from tribal lands. 

Enbridge has since begun work on rerouting Line 5 around the reservation, a move that has been contested by tribal communities and environmental groups as endangering ecosystems and natural resources. Legal battles over the pipeline’s future continue in federal court. Advocates have called on the Wisconsin DNR to revoke the permits granted to Enbridge to carry out the reroute.