The Wisconsin Supreme Court on Tuesday heard oral arguments in a case that could upend the Department of Natural Resources’ (DNR) authority to enforce the state’s decades old spills law, which allows the agency to hold companies and property owners responsible for toxic contamination.

The Wisconsin Supreme Court on Tuesday heard a case that could have big implications for residents whose water has been contaminated by dangerous forever chemicals known as PFAS.

The justices seemed unconvinced by the argument that the law governing chemical spills is overly vague, and appeared in favor of offering state officials flexibility on enforcement.