604 U.S. 334
SCOTUS2025Background
- The City and County of San Francisco operates wastewater treatment facilities subject to the Clean Water Act (CWA) and its National Pollutant Discharge Elimination System (NPDES) permitting scheme.
- In 2019, the EPA renewed San Francisco's NPDES permit for its Oceanside facility, adding two "end-result" provisions: (1) no discharge causing a violation of water quality standards, and (2) no discharge creating pollution/nuisance as defined by California law.
- San Francisco challenged these provisions, arguing they exceeded the EPA's statutory authority under the CWA.
- The Ninth Circuit upheld EPA's authority under CWA §1311(b)(1)(C) to include such provisions; San Francisco petitioned for Supreme Court review.
- The core dispute was whether the CWA allows EPA to condition permits on end results (i.e., the quality of the receiving water) rather than prescribing actions or effluent limits that dischargers must follow.
Issues
| Issue | Plaintiff's Argument | Defendant's Argument | Held |
|---|---|---|---|
| Whether §1311(b)(1)(C) allows "end-result" permit terms | San Francisco: EPA cannot include end-result provisions, only specific limitations. | EPA: CWA authorizes any limitation to ensure water quality standards. | EPA lacks authority for end-result requirements. |
| Scope of “limitations” in §1311(b)(1)(C) | Limitations must be effluent-based (technology/practice-focused). | “Limitations” can include broader narrative or end-result conditions. | “Limitations” can go beyond effluent, but not to end-result. |
| Effect on Permit Shield protection | End-result terms strip permittees of clear notice and shield protection. | End-result ensures water quality but shield still protects compliance. | Such terms undercut the permit shield; not authorized. |
| How to resolve insufficient data on pollution controls | EPA must determine steps, not shift burden to permittee through end-result terms. | Broad terms appropriate where EPA lacks data, permittee knows best options. | EPA must specify steps; cannot rely on end-result clauses. |
Key Cases Cited
- EPA v. California ex rel. State Water Resources Control Bd., 426 U.S. 200 (1976) (explains shift from abatement to direct regulation in CWA)
- Russello v. United States, 464 U.S. 16 (1983) (canon that differing statutory language is intentional)
- Arkansas v. Oklahoma, 503 U.S. 91 (1992) (CWA allows effluent and water quality-based limits)
- E.I. du Pont de Nemours & Co. v. Train, 430 U.S. 112 (1977) (discusses purpose of the permit shield)
- National Assn. of Mfrs. v. Department of Defense, 583 U.S. 109 (2018) (interpretation of "effluent limitation or other limitation" in CWA)