Groups filed a lawsuit Monday that challenges a Section 404 permit for Williams Cos.' Southeast Supply Enhancement project. The lawsuit, filed by environmental groups, targets the federal permit that allows the company to conduct activities that could affect wetlands and other protected areas under the Clean Water Act. The permit in question is a Section 404 permit, which is required for any discharges into U.S. waters. The project is part of Williams Cos.' broader strategy to expand midstream infrastructure across the Southeast. If the permit is denied or delayed, Williams Cos. may need to seek alternative routing or additional environmental approvals, potentially pushing back the project's timeline and increasing costs.