EPA proposes to curtail state and tribal power under Clean Water Act

The Environmental Protection Agency proposed a rule that would sharply narrow the authority of states and authorized tribes under Section 401 of the Clean Water Act, limiting their ability to condition, delay or effectively block federally permitted projects that may affect waterways. The move would confine reviews to direct water-quality effects of discharges, impose a one-year deadline for certification decisions and replace the Biden administration’s broader implementation of the provision.

Under the proposal, certifying authorities could no longer base decisions on indirect or non-discharge impacts such as air pollution, traffic, greenhouse gas emissions or other harms that some states and tribes have considered when imposing conditions or withholding certification from major projects. The EPA would also cap the period for states and tribes to act on Section 401 certification requests at one year, a change officials say will create predictability for project proponents including pipeline builders, transmission-line developers, coal-export terminals and operators of large data centers.

Jess Kramer, the agency’s assistant administrator for water, told reporters and in briefing remarks that the proposed rule “will increase transparency, efficiency and predictability for certifying authorities and the regulated community” and “ensure states and authorized tribes adhere to their Section 401 role.” Agency officials have argued that constraining the scope and timeline of reviews will reduce delays that have stalled energy and infrastructure projects.

Supporters contend the changes would deliver regulatory clarity and reduce the uncertainty that can add months or years to permitting timelines. Developers and some state officials say a tighter, time-bound process will ease planning for projects that promise jobs and economic activity.

Critics warn the proposal would substantially weaken a key local safeguard for waterways and the communities that depend on them. Nancy Stoner, a senior attorney at the Environmental Law & Policy Center, said limiting reviews to direct discharges could “weaken oversight” of projects such as dams, where indirect impacts like blocked fish migration, altered river flows or secondary pollution have long informed certification decisions. Environmental and tribal advocates argue the rule would strip communities of the ability to weigh cumulative and regional harms that do not fit narrowly defined discharge metrics.

Public-health and environmental-justice advocates say the proposed change risks shifting burdens onto frontline communities already facing polluted waterways and limited resources for remediation. State and tribal certifications have been used to press for mitigation measures, monitoring and enforceable conditions intended to protect drinking water sources, fisheries and culturally significant sites. Narrowing that authority could reduce local leverage to safeguard those protections.

The scope of Section 401 authority has shifted under successive administrations: the first Trump administration curtailed state power, the Biden administration expanded it, and the current proposal tightens constraints again. Key uncertainties remain, including the final regulatory text, how the rule will define “direct” water-quality effects in practice and how courts will interpret any changes. States and tribes will also have to determine whether and how to adapt their certification programs to the new timeline and scope.

The EPA has opened a public comment period as it moves toward a final rule. Legal challenges are likely if the agency finalizes restrictions that states and tribes view as undermining their role in protecting local waters and communities.