Pittsburgh, PA
Environmental Alert
(by Lisa Bruderly, Joseph Schaeffer, and Alexandra Graf)
On March 4, 2025, the U.S. Supreme Court held in a 5-4 decision in City and County of San Francisco v. EPA, et al. that the U.S. Environmental Protection Agency (EPA) lacks authority under the federal Clean Water Act (CWA) to impose National Pollutant Discharge Elimination System (NPDES) permit requirements that condition compliance on whether receiving waters meet applicable water quality standards (i.e., “end-result” requirements). NPDES permits are issued to allow point sources discharges of pollutants into waters of the United States. These permits typically include limitations as to the quality/quantity of effluent that can be discharged (i.e. effluent limitations). Some permits also require best management practices to reduce pollution in discharges (i.e., narrative requirements). While the Supreme Court did not question the imposition of effluent limitations or narrative requirements, the issue at hand pertained to whether NPDES permits can include “end-result” requirements (e.g., a requirement that a discharge cannot exceed water quality standards).
In 2019, two end-result requirements were added to San Francisco’s NPDES permit for its combined wastewater treatment facilities that prohibited the facility from: (1) making any discharge that “contributes to a violation of any applicable water quality standard” for receiving waters, and (2) performing any treatment or making any discharge that “create[s] pollution, contamination, or nuisance as defined by California Water Code section 13050.”
The U.S. Supreme Court granted certiorari after the Ninth Circuit denied San Francisco’s petition and held that §1311(b)(1)(C) of the CWA allows EPA to impose “any” limitations that ensure the applicable water quality standards are satisfied in a receiving body of water. This is the Court’s first major CWA case since Sackett v. …