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On January 15, 2026, the Environmental Protection Agency (EPA) published the long-awaited proposed rule Updating the Water Quality Certification Regulations (Proposed Rule), which, if adopted, would largely reinstate the previous Trump administration’s 2020 Clean Water Act Section 401 Certification Rule (2020 Rule). EPA’s proposal seeks to limit the scope of state-issued water quality certifications (WQCs) under Section 401 of the Clean Water Act (CWA) to water quality impacts associated with discharges authorized by federal agency actions. The Proposed Rule also addresses concerns raised by applicants for federal licenses and permits (including for hydroelectric projects, natural gas pipelines, and other energy and infrastructure projects) that certain states have overstepped their Section 401 authority to impose onerous terms and conditions unrelated to water quality and artificially extended the statutory time limits for issuing WQCs.

On January 8, 2026, the U.S. Army Corps of Engineers finalized 57 Nationwide Permits first proposed in June of last year. Nationwide Permits (NWPs) are streamlined federal permits for activities that affect waters of the United States, ranging from routine development and infrastructure projects to major projects. In this action…

Over the past decade, the definition of “waters of the United States” (WOTUS) has shifted repeatedly, creating uncertainty for permitting and project planning. Building on the Supreme Court’s Sackett v. EPA decision, the EPA and the U.S. Army Corps of Engineers (together, the agencies) announced a proposal this week to further refine which water features qualify as WOTUS by narrowing key definitions and codifying — and expanding — exclusions. The proposal would apply across all Clean Water Act (CWA) programs that rely on WOTUS, including permitting under Sections 404 and 402, water quality certifications under Section 401, and Total Maximum Daily Loads (TMDLs) for impaired waters under Section 303. The proposal is directionally deregulatory, meaning fewer waters are likely to be considered federally jurisdictional and therefore regulated. The new definition was published in the Federal Register on Thursday, marking the start of a 45-day public comment period through January 5, 2026. The public comment page can be accessed here.

I.  General Background

On December 17, 2024, the Railroad Commission of Texas (RRC) adopted new comprehensive regulations governing the handling, storage, treatment, and disposal of oil and gas waste. The rules were published January 3, 2025, in the Texas Register and become effective on July 1, 2025. They codify formerly informal guidance and ad hoc permitting practices and also update existing oil and gas waste regulations to align with technological advancements.

The California legislature continues to advance Senate Bill 601 (SB 601), the “Right to Clean Water Act,”[1] which aims to safeguard protections for California’s streams and wetlands that lost federal protection under the Clean Water Act (CWA) as a result of the Supreme Court’s 2023 Sackett v. U.S. EPA decision. If approved, SB 601 would expand enforcement to include citizen suits and increase penalties for unpermitted discharges to state waters.

Effective February 3, 2025, the New Jersey Department of Environmental Protection (NJDEP) adopted amendments to the Ground Water Quality Standards (GWQS), N.J.A.C. 7:9C. The amendments updated the groundwater quality criteria and/or practical quantitation levels (PQLs) for 73 constituents, the vast majority of which became more stringent. For example, groundwater quality standards for tetrachloroethylene (PCE) and vinyl chloride were changed from 1 µg/l to 0.4 µg/l and 0.035 µg/l, respectively. Of note, the decrease attributable to vinyl chloride is by more than an order of magnitude – a significant and regulatorily meaningful change. NJDEP also amended its rounding protocols to round new or revised groundwater standards to two significant figures rather than one. The amendments enable NJDEP to update specific groundwater criteria for constituents with corresponding Safe Drinking Water Act (SDWA) maximum contaminant levels (MCLs) when NJDEP determines the weight of evidence approach would more appropriately address risks posed by such constituents than the health-based levels used to establish MCLs.

President Trump hit the ground running, issuing more executive orders, memoranda, and other actions on Inauguration Day than any previous president. Agencies are already working to implement those actions. Many of the actions are interrelated, so Troutman Pepper Locke’s Environmental + Natural Resources team has put together the following resource to help assess the impact of these actions on environmental policy, and how the various actions fit together.

Introduction

On November 30, 2023, the U.S. Environmental Protection Agency (EPA) released its Proposed Lead and Copper Rule Improvements (LCRI).[1] With this proposal, EPA aims to simplify and expand upon the 2021 Lead and Copper Rule Revisions (LCRR) and the original 1991 Lead and Copper Rule (LCR). The proposed LCRI outlines aggressive measures to achieve further reductions of lead in drinking water. This initiative brings to the forefront a critical question: Are the potential health benefits projected by EPA enough to justify the scope and extent of the rule and its related hefty price tag?

On November 20, with no fanfare at all, not even a press release, U.S. Environmental Protection Agency (EPA) issued its Draft Guidance: Applying the Supreme Court’s County of Maui v. Hawaii Wildlife Fund Decision in the Clean Water Act Section 402 National Pollutant Discharge Elimination System Permit Program to Discharges Through Groundwater. This draft guidance is the agency’s second effort to guide implementation of the U.S. Supreme Court’s 2020 decision, which extends applicability of the National Pollutant Discharge Elimination System (NPDES) permitting program to include the “functional equivalent” of point source discharges of pollutants to waters of the U.S.

The U.S. Environmental Protection Agency (EPA) has finalized a new regulation to implement the Clean Water Act (CWA) section 401 water quality certification program. Continuing the recent practice of promulgating regulations and then promptly replacing them, EPA’s “CWA Section 401 Water Quality Certification Improvement Rule”(the 2023 Rule) replaces the “Clean Water Act Section 401 Water Quality Certification Rule” that was finalized in 2020 (the 2020 Rule). The 2023 Rule was published in the Federal Register on September 27, 2023 and will become effective on November 27, 2023. This article provides background on the CWA water quality certification program, followed by a deep dive into the 2023 Rule and how it compares to the 2020 Rule.