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EPA water rule review

National Assn. of Mfrs. v. Department of Defense

Updated Oct 18, 2026

In brief

The Supreme Court overturned the Sixth Circuit’s ruling and sent the case back to that court.

Where it stands
Decided

Decided 9-0 · January 22, 2018 · Opinion by Justice Sotomayor

What it’s about
The Court overturned the Sixth Circuit’s ruling and sent the case back to it (remanded), deciding that challenges to the EPA’s Clean Water Act rule defining which waters are covered must be filed in federal district courts, not federal appeals courts.
Who it affects
The Sixth Circuit’s ruling no longer stands, and the case returns to that court.

Summary: written with AI from the case record.

Illustration for National Assn. of Mfrs. v. Department of Defense
Conceptual illustration · AI-generated

What it's about

The challenged rule defines the scope of the Clean Water Act’s coverage.

Question presented

Does the Clean Water Act grant federal courts of appeals jurisdiction to review the Environmental Protection Agency’s rule that defines the scope of United States waters?

What the Court decided

Holding

Judgment REVERSED and case REMANDED. Sotomayor, J., delivered the opinion for a unanimous Court.

Result
Reversed

The vote

  • Joined the judgment
  • Wrote an opinion
Majority · 9joined the Court's opinion
  1. Breyer
  2. Kagan
  3. Thomas
  4. Kennedy
  5. Ginsburg
  6. Sotomayorwrote the opinion
  7. Roberts
  8. Gorsuch
  9. Alito
9 justices joined the judgment.

What's next

The case returns to the Sixth Circuit for further proceedings.

Documents

3

Docket activity

8
  • New analysis added

    Oct 18, 2026 · Court records

  • AI analysis generated: Case Briefing

    Oct 18, 2026 · Generated

  • AI analysis generated: Decision Record

    Oct 18, 2026 · Generated

  • Case data updated: summary, question_presented, generation_metadata

    Oct 18, 2026 · Court records

  • Case data updated: question_presented, extraction_metadata

    Oct 18, 2026 · Court records

Show 3 more
  • Opinion added: Opinion

    Jan 22, 2018 · Court records

  • Opinion added: opinion

    Jan 22, 2018 · Court records

  • Brief added: Questions Presented

    Court records

Sources

Primary materials plus reporting. Best-effort analysis: this explainer relies on a mix of primary materials and trusted secondary sources. Official filings and opinions remain authoritative.

Checked Oct 18, 2026Methodology

Court records and filings

Reporting and analysis