South Florida Water Management District v. Miccosukee Tribe of Indians

Background

The dispute involves a regional water agency that operates a pump moving water from a developed canal (C-11) a short distance into a nearby Everglades wetland (WCA-3). Local tribes and environmental groups sued under the Clean Water Act because the canal water contains elevated phosphorus from farms and development, which can harm the wetland. The district court and the Court of Appeals found the pump needed a federal discharge permit, treating the canal and wetland as separate water bodies.

Reasoning

The Court examined whether operating the S-9 pump counts as the “discharge of a pollutant” requiring an NPDES permit. It rejected the agency’s argument that a pump is exempt simply because it does not add new pollutants itself. The Court declined to decide a broader “unitary waters” argument now and concluded that the lower courts had applied summary judgment prematurely because disputed factual evidence remains about whether the canal and wetland are meaningfully distinct.

Real world impact

The ruling sends the case back for more factual study of local hydrology and flooding risks before deciding if the pump needs a permit. That means water managers, wetlands, and nearby residents may see continued uncertainty about permit requirements. The decision is not a final ruling on whether permits are required; the factual record and the government’s broader argument can be revisited on remand.

Dissents or concurrances

Justice Scalia agreed with the Court that a pump can be a point source but disagreed with vacating and remanding; he would have affirmed the appeals court without reaching additional issues.