Supreme Court backs San Francisco in Clean Water Act case, limits EPA authority on sewage discharge

WASHINGTON, D.C. (UI) — The U.S. Supreme Court issued a 5-4 decision in favor of San Francisco on March 4, ruling that the Environmental Protection Agency (EPA) cannot hold the city accountable for water quality conditions it cannot control.

The ruling, in City and County of San Francisco v. Environmental Protection Agency, limits the EPA’s authority over wastewater discharge permits and reinforces Clean Water Act provisions requiring the agency to set clear pollution limits.

The decision clarifies that permits under the Clean Water Act (CWA) should focus on a discharger’s specific pollution levels, rather than the overall water quality of shared water bodies, such as San Francisco Bay and the Pacific Ocean. The ruling could have broad implications for how cities nationwide manage wastewater and stormwater treatment.

San Francisco officials welcomed the decision, arguing that it upholds fair permitting rules.

“We are very pleased the Court issued the narrow decision San Francisco sought,” City Attorney David Chiu and San Francisco Public Utilities Commission (SFPUC) General Manager Dennis Herrera said in a joint statement. “This decision upholds the Clean Water Act’s critical role in protecting water quality and simply requires the EPA to fulfill its obligations under the Clean Water Act, as intended by Congress.”

Legal battle over discharge permits

The case stemmed from an EPA decision to include controversial “end-result” provisions in San Francisco’s wastewater discharge permits, which would have required the city to ensure overall water quality in receiving waters, rather than just regulating its own discharges. The city challenged those provisions, arguing that it could not be held responsible for pollution caused by outside sources.

The Supreme Court’s majority agreed, ruling: “[W]e hold that §1311(b)(1)(C) does not authorize the EPA to include ‘end-result’ provisions in NPDES permits. Determining what steps a permittee must take to ensure that water quality standards are met is the EPA’s responsibility, and Congress has given it the tools needed to make that determination. If the EPA does what the CWA demands, water quality will not suffer.”

The decision follows years of legal back-and-forth over the EPA’s permitting authority. The dispute began when the agency included the contested provisions in San Francisco’s Bayside Permit renewal in 2013 and later added them to the city’s Oceanside Permit in 2019, prompting the lawsuit.

The ruling is expected to benefit other major cities, including Boston, New York, and Washington, D.C., whose wastewater agencies had supported San Francisco’s position through amicus briefs.

San Francisco’s wastewater infrastructure

San Francisco operates a combined sewer system, meaning wastewater and stormwater are treated together before being discharged. This differs from many other municipalities, where stormwater flows untreated into waterways.

The city has invested more than $2 billion in upgrading its wastewater infrastructure and plans to spend an additional $2.36 billion over the next 20 years on further improvements. Officials say the Supreme Court ruling ensures the city can continue managing its wastewater system without additional regulatory burdens from the EPA.

“This is a good government decision that assures certainty in water quality permitting and that every permittee has predictable, knowable standards to protect water quality,” Chiu and Herrera said.

The ruling is seen as a major precedent in the ongoing debate over how the Clean Water Act is applied and the limits of federal oversight in water quality enforcement.

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