City and County of San Francisco v. EPA

In this case, the court considered this issue: Does the Clean Water Act allow the Environmental Protection Agency (or an authorized state) to impose generic prohibitions in National Pollutant Discharge Elimination System permits that subject permit-holders to enforcement for violating water quality standards without identifying specific limits to which their discharges must conform?The case was decided on March 4, 2025.The Supreme Court held that the Clean Water Act does not authorize the EPA to include “end-result” provisions in wastewater discharge permits. Justice Samuel Alito authored the 5-4 majority opinion of the Court.First, while rejecting San Francisco’s broader argument that all limitations must be “effluent limitations,” the Court focused on §1311(b)(1)(C)’s authorization of “any more stringent limitation” necessary to meet water quality standards. The terms “limitation,” “implement,” and “meet” in this provision require the EPA to specify concrete actions permittees must follow, not merely mandate end results without guidance. A proper “limitation” is a “restriction imposed from without,” not a directive that forces permittees to determine compliance measures themselves.Second, Congress deliberately abandoned the pre-1972 backward-looking approach that had directly penalized polluters for water quality violations. The CWA’s “permit shield” provision, which protects compliant permittees from penalties, would be undermined if end-result requirements could expose permittees to massive penalties despite following all specified steps. Additionally, the EPA’s interpretation offered no solution for fairly allocating responsibility among multiple dischargers affecting the same body of water. Determining necessary compliance steps is the EPA’s responsibility, and Congress has provided the agency with sufficient tools to make these determinations without resorting to end-result requirements.Justice Amy Coney Barrett authored a dissenting opinion, in which Justices Sonia Sotomayor, Elena Kagan, and Ketanji Brown Jackson joined.The opinion is presented here in its entirety, but with citations omitted. If you appreciate this episode, please subscribe. Thank you.