The Environmental Protection Agency (EPA) has put forth a significant proposal to revise Section 401 of the Clean Water Act, a critical provision that governs water quality standards and delineates the authority of states and Native American tribes in relation to federal projects. Experts express deep concern that this proposed modification could dismantle one of the few effective mechanisms tribes possess to uphold treaty rights and safeguard their citizens’ access to clean water, potentially curtailing their regulatory power over projects impacting their lands. Miles Johnson, legal director at Columbia Riverkeeper, an organization dedicated to protecting the Columbia River ecosystem, highlighted that the proposed changes target a vital tool for both states and tribes, which allows them to impose conditions on, or in extreme circumstances, reject federal projects.

Developers undertaking projects such as dams, mines, data centers, or pipelines are required to obtain certification affirming that their endeavors will meet federal water quality standards. Historically, this process has enabled tribes and states to conduct comprehensive, or "activity as a whole," reviews of proposed developments. This holistic approach, reaffirmed by the Biden administration in 2023, allowed for the evaluation of a broad spectrum of potential water quality impacts, including risks of spills, threats to cultural resources, and detrimental effects on aquatic life and tribal economies. However, the EPA’s new proposal aims to narrow the scope of these reviews, limiting them strictly to "discharge only," meaning oversight would be confined solely to the quantity of pollution a project intends to release, thereby significantly diminishing the ability of tribes and states to conduct thorough environmental assessments.

Furthermore, the proposed rule introduces substantial changes to how tribes can acquire regulatory authority through the "Treatment in a Similar Manner as a State" (TAS) program. Under the existing TAS framework, federally recognized tribes can assume regulatory responsibilities akin to those of states, granting them a crucial avenue to set conditions designed to prevent pollution in waters adjacent to tribal territories. Currently, only 84 tribal nations have achieved TAS status, empowering them to review federal projects. Section 401 of the Clean Water Act has historically provided a pathway for tribes demonstrating the capacity and resources to conduct water quality reviews, extending regulatory powers beyond those tribes with extensive financial backing. The proposed alteration would effectively restrict this authority, permitting only TAS tribes to undertake such evaluations, and even then, through a separate and more demanding authorization process.

Heather Tanana, a law professor at the University of Denver, underscored the profound importance of treaty rights as a robust legal framework for asserting claims against federal and state governments, as well as third-party actors, especially in litigation. She emphasized that pursuing treaty rights is an arduous and costly undertaking, underscoring the necessity of supplementary mechanisms like the Clean Water Act’s Section 401 certification process for tribes. Tanana explained that a reversion to pre-2023 regulatory standards would impose a significantly higher burden on tribes to demonstrate substantial operational capacity, often requiring the establishment of dedicated environmental or water departments. She pointed out the wide disparity in resources available to different tribal nations, noting variations in revenue streams, staffing levels, and the presence of dedicated environmental agencies, which can range from a single individual to a large team.

During the Biden administration, tribes actively advocated for a baseline rule that would ensure all tribes had some level of input on federal projects, even while pursuing TAS status. However, industry opposition during the public comment period and subsequent political shifts led to the withdrawal of that proposed rule by the EPA in December. Patrick Hunter, a senior attorney at the Southern Environmental Law Center, noted that out of thousands of federal projects submitted during the Biden administration, a mere fraction, less than one percent, were denied; most were approved with stipulations such as mitigation measures and sediment control systems to minimize water pollution during construction. Tanana confirmed that outcomes of tribal reviews generally mirrored these findings, with a focus on conditional approvals rather than outright denials.

The EPA’s 2025 report on tribal consultations starkly highlighted widespread opposition to the proposed changes. Tanana relayed the consistent message from tribal representatives: "Don’t change it," and "You’re going to make it harder for us to exercise our sovereignty to protect our waters and protect our community." A 30-day public comment period on the proposed rule is currently underway, and legal experts anticipate significant litigation following its finalization. Gussie Lord, head of tribal partnerships at Earthjustice, affirmed that tribes bear a fundamental responsibility to steward the rivers and waterways that have sustained their communities for millennia, and they are exploring all available avenues to protect their ancestral ways of life. This proposed regulatory shift represents a critical juncture in the ongoing effort to balance economic development with the inherent sovereign rights and environmental protection responsibilities of Native American tribes. The implications extend beyond immediate water quality concerns, touching upon broader issues of tribal sovereignty, self-determination, and the federal government’s trust responsibilities to Indigenous peoples. The debate over Section 401 reflects a larger, recurring tension between industrial interests seeking streamlined permitting processes and tribal nations striving to maintain the integrity of their ancestral lands and waters, which are intrinsically linked to their cultural identity and survival.