Northwest Environmental Advocates v. United States Environmental Protection Agency; King County; City of Tacoma

District Court, W.D. Washington·Decided April 3, 2026·No. 2:21-cv-01637·Unknown

Opinion

The Honorable Barbara J. Rothstein

WESTERN DISTRICT OF WASHINGTON

Case No. 2:21-cv-1637-BJR NORTHWEST ENVIRONMENTAL ADVOCATES, ORDER ON CROSS-MOTIONS FOR SUMMARY JUDGMENT Plaintiff,

v.

PROTECTION AGENCY, et al. Defendants, and KING COUNTY and the CITY OF TACOMA, Intervenor-Defendants.

I. INTRODUCTION This matter is before the Court on cross motions for summary judgment by Plaintiff Northwest Environmental Advocates (“Plaintiff”); Defendants Environmental Protection Agency

(“EPA”), Michael Regan, and Casey Sixkiller (collectively, “Defendants”),1 and Intervenor-Defendants City of Tacoma and King County (collectively, “Intervenor-Defendants”). Plaintiff brings a single claim under the citizen-suit provision of the Clean Water Act (“CWA”), 33 U.S.C. § 1365(a)(2), alleging that Defendants failed to perform a nondiscretionary duty under the CWA pertaining to pollution in Washington State’s Puget Sound. Having reviewed the materials and the relevant legal authorities, the Court denies Plaintiff’s Motion for Summary Judgment and grants the Motions for Summary Judgment filed by Defendants and Intervenor-Defendants. The reasoning for the Court’s decision follows. A. Procedural History Plaintiff Northwest Environmental Advocates is a non-profit environmental organization

concerned with water and air quality in the Northwest. Amend. Compl. ¶ 14, Dkt. No. 24. Plaintiff initiated this action in December 2021. In September 2022, the Court administratively closed the case while the parties pursued settlement negotiations. In July 2024, following failed settlement negotiations, the Court granted a joint motion by the parties to reopen the case. In November 2024, the Court granted a joint motion by the City of Tacoma and King County to intervene in this action. Plaintiff now moves for summary judgment on its CWA citizen-suit claim. Defendants have jointly filed a cross-motion for summary judgment. Intervenor-Defendants have also jointly filed a cross-motion for summary judgment. Additionally, each of the parties raise evidentiary objections. B. The CWA Statutory Framework

1 Michael Regan is sued in his official capacity as Administrator of the EPA. Casey Sixkiller is sued in his individual capacity as EPA Region 10 Administrator.

Congress passed the CWA to “restore and maintain the chemical, physical, and biological integrity of the Nation’s waters.” 33 U.S.C. § 1251. In order to achieve that objective, Congress declared as a “national goal” that the “discharge of pollutants into the navigable waters be eliminated by 1985.” Id. § 101(a)(1). The CWA’s regulatory program focuses on two potential sources of pollution: “point” sources and “nonpoint” sources. A “point” source is any “discernible, confined and discrete conveyance” from which pollutants may be discharged. See id. § 1362(14). A “nonpoint” source is any non-discrete source, such as runoff from stormwater or irrigation of agriculture. Id. The CWA regulates point source pollution through the National Pollution Discharge Elimination System (“NPDES”) permit process. NPDES permits limit the discharge of pollutants through quantitative limits on the amount of pollutants released from each point source. See id. § 1342. The EPA has

the authority to issue NPDES permits itself, id. § 1342(a), or delegate that responsibility to the States, id. § 1342(b). It has done so in almost every State, including Washington. 39 Fed. Reg. 26,061 (1974). As part of its regulatory program, § 303(d) of the CWA imposes duties on the states and the EPA. States are required, subject to federal oversight, to adopt water quality standards for each waterbody or waterbody segment within the state’s boundaries. 33 U.S.C. § 1313. If a waterbody does not meet these standards or is not expected to meet them, the state must then designate that body as a “water quality limited segment.” 40 C.F.R. § 130.2. The list of water quality limited segments is known as the “303(d) list.” States are further required to establish a “priority ranking” of the water quality limited segments based on “the severity of the pollution and the uses to be made

of such waters.” 33 U.S.C. § 1313(d)(1)(A). Consistent with these priorities, States must establish “total maximum daily loads” (“TMDL”) for each pollutant impairing a water quality limited

segment. 40 C.F.R. § 130.2(f). A TMDL establishes the maximum amount of pollutants a water quality limited segment can receive daily without violating the state’s water quality standards. Id. States must submit the ranked list of water quality limited segments and TMDLs to the EPA “from time to time.” 33 U.S.C. § 1313(d)(2). Once a submission is made, certain mandatory EPA duties are triggered. First, within 30 days of submission, the EPA must approve or disapprove of the water quality limited segments and corresponding TMDLs. Id. If the EPA approves a submission, that submission is incorporated by the state into its continuing planning process and NPDES permitting. Id. § 303(e)(3). If the EPA disapproves, the EPA must, within 30 days of the disapproval, make its own identification of appropriate water quality limited segments or establish its own TMDLs. Id. C. Pollution and Dissolved Oxygen Levels in Puget Sound2

This case concerns the effects of pollution on dissolved oxygen levels in Puget Sound. Puget Sound is an inlet of the Pacific Ocean comprised of a vast network of interconnected marine waterways, river deltas, and basins that open to the Strait of Juan de Fuca and the Strait of Georgia. See Administrative Record (“AR”)_0011044 n.1, AR_0016538-39, AR_0016544. These waters are collectively referred to as the “Salish Sea.” Amend. Compl. ¶ 58. It is undisputed by the parties that environmental pollution is endangering the health of marine species in Puget Sound. One of the pollutants impairing Puget Sound is nitrogen. AR_0007095, AR_0016537. Puget Sound receives nitrogen from both natural and anthropogenic sources. AR_0007095, AR_0032430. Among the anthropogenic sources, wastewater treatment facilities are Puget Sound’s largest source of nitrogen loading. AR_0007096, AR_0017555; see

2 The factual allegations referenced in this subsection are undisputed.

also AR_0013866 (showing sewage treatment plants contribute to nitrogen loading 60 percent annually and 80 percent in summer). Excess nitrogen fuels growth of marine plants like algae. AR_0016537. As these plants die and decompose, they consume large amounts of dissolved oxygen, thereby lowering overall dissolved oxygen levels. Id. Low levels of dissolved oxygen, in turn, lead to the migration, weakening, and death of fish and other organisms. Id., AR_0007094, AR_0016626. Washington’s water quality standards include minimum levels of dissolved oxygen. Amend. Compl. ¶ 108. As of 2019, the Washington Department of Ecology (“Ecology,” or the “State”) estimates that approximately 20 percent of Puget Sound violates water quality standards for dissolved oxygen. AR_0011044. D. Efforts to Reduce Nitrogen Pollution and Improve Dissolved Oxygen Levels

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Northwest Environmental Advocates v. United States Environmental Protection Agency; King County; City of Tacoma, (W.D. Wash. 2026).

Northwest Environmental Advocates v. United States Environmental Protection Agency; King County; City of Tacoma (Northwest Environmental Advocates v. United States Environmental Protection Agency; King County; City of Tacoma) — published by Counsel Stack Legal Research, free access to 12M+ legal documents.

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