Unanimous.

The Supreme Court on Tuesday ruled against the Obama administration in a case regarding water pollution permits.

The nation’s highest court ruled unanimously that a landowner can appeal through the federal court system a determination from the Army Corps of Engineers that a water body is subject to federal jurisdiction and permit requirements under the Clean Water Act.

The court’s eight justices agreed in Army Corps of Engineers v. Hawkes Co. Inc. that the Corps’s final “jurisdictional determination” regarding a peat mining company’s wetlands is a “final agency action,” so the company can challenge it like any regulation.

The case is likely to have consequences for the federal government’s entire enforcement of the Clean Water Act, the main law regarding pollution control.