Massachusetts v. Environmental Protection Agency
549 U.S. 497 · Decided April 2, 2007 · Supreme Court of the United States
Record summary. This page is generated from the Supreme Court Database’s coded data about the case. It describes who decided what, not the Court’s reasoning. Read the opinion itself before relying on it. Not legal advice.
At a glance
Massachusetts v. Environmental Protection Agency was decided on April 2, 2007 by a vote of 5–4. The Court reversed the lower court's decision and remanded the case. Justice John Paul Stevens wrote the opinion of the Court. SCDB classifies its main issue as “Standing, personal injury” in the Judicial Power area.
Read the opinion
Case details
- Citations
- 549 U.S. 497 · 127 S. Ct. 1438 · 167 L. Ed. 2d 248 · 2007 U.S. LEXIS 3785
- Docket number
- 05-1120
- Decided
- April 2, 2007
- Argued
- November 29, 2006
- Court era
- Roberts Court
- Decision type
- Opinion of the Court (orally argued)
- Disposition
- Reversed and remanded
- Outcome for petitioner
- The petitioning party received a favorable disposition
- Vote
- 5–4
- Majority opinion
- John Paul Stevens
- Opinion assigned by
- John Paul Stevens
- How the case arrived
- Certiorari
- Issue (SCDB)
- Standing, personal injury
- Issue area
- Judicial Power
- Legal provision
- Article III, Section 2, Paragraph 1 (case or controversy requirement)
- Type of law
- Constitution
- Decision direction (SCDB)
- Liberal what this means
How the Justices voted
| Justice | Vote | Separate writing |
|---|---|---|
| Justice John Paul Stevens | Majority | Wrote an opinion |
| Justice Antonin Scalia | Dissent | Wrote an opinion |
| Justice Anthony M. Kennedy | Majority | |
| Justice David H. Souter | Majority | |
| Justice Clarence Thomas | Dissent | |
| Justice Ruth Bader Ginsburg | Majority | |
| Justice Stephen G. Breyer | Majority | |
| Chief Justice John G. Roberts Jr. | Dissent | Wrote an opinion |
| Justice Samuel A. Alito Jr. | Dissent |
Full case caption
Massachusetts, et al. v. Environmental Protection Agency et al.
SCDB identifiers: case 2006-026, docket 2006-026-01.
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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