Union Electric Co. v. Environmental Protection Agency

427 U.S. 246 · Decided June 25, 1976 · Supreme Court of the United States

At a glance

Union Electric Co. v. Environmental Protection Agency was decided on June 25, 1976 unanimously (9–0). The Court affirmed the lower court's decision. Justice Thurgood Marshall wrote the opinion of the Court. SCDB classifies its main issue as “Natural resources and environmental protection” in the Economic Activity area.

Read the opinion

• CourtListener (Free Law Project) — opinion text
• Library of Congress — official U.S. Reports scan

Case details

How the Justices voted

Full case caption

Union Electric Co. v. Environmental Protection Agency et al.

SCDB identifiers: case 1975-153, docket 1975-153-01.

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Same Term, same area (Economic Activity)

• Day & Zimmermann, Inc. v. Challoner
  423 U.S. 3Decided November 3, 19758–0Per curiam
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  423 U.S. 276Decided January 14, 19768–0William J. Brennan Jr.
• United States v. Bornstein
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Source: Supreme Court Database, 2026 Release 01 (data file dated September 8, 2026). Imported into CaseTrail November 5, 2026. Coverage: decisions from the 1946 through 2025 Terms. Methodology · Report an error