U.S. Court of Appeals for the Ninth Circuit

Inland Empire Waterkeeper v. Corona Clay Company

September 3, 2026

Summary

The Ninth Circuit reversed the district court’s denial of Corona Clay’s motion for a new trial and affirmed the denial of its motion to dismiss for lack of subject‑matter jurisdiction, holding that whether Temescal Creek is a “water of the United States” is a merits issue, not a jurisdictional one, and that the intervening Supreme Court decision in Sackett warrants a new trial. The case was remanded for further proceedings on the applicability of the Clean Water Act to the creek.