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Last month, the U.S. Environmental Protection Agency (EPA) announced the draft Sixth Contaminant Candidate List (CCL 6) under the Safe Drinking Water Act (SDWA) and released it for public comment. CCL 6 identifies contaminants that are not yet regulated but are known or anticipated to occur in public water systems and may require future regulation. The draft list includes four contaminant groups — microplastics, pharmaceuticals, per‑ and polyfluoroalkyl substances (PFAS), and disinfection byproducts — along with 75 individual chemicals and nine microbes that may be found in drinking water. Although PFAS were included on prior lists, this is the first time the EPA has designated microplastics or pharmaceuticals as priority contaminant groups. Inclusion on the draft CCL 6 signals an emerging concern about these new contaminant groups and the potential for future regulatory action.

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.

As the longest federal government shutdown on record continued earlier this week, EPA stayed busy putting the finishing touches on one of its PFAS-related priorities — enabling EPA to “smartly collect” information about PFAS substances under the Toxic Substances Control Act (TSCA) as required by Congress in the National Defense Authorization Act for Fiscal Year 2020. Early signs of EPA’s desire to simplify the TSCA PFAS reporting rule, which was finalized by the Biden EPA in 2023, were evident in the agency’s April 2025 announcement of “Major Actions to Combat PFAS Contamination” discussed here, where EPA committed to implement the required information collection “without overburdening small businesses and article importers.”

On June 17, the Environmental Protection Agency (EPA) published a proposed rule to approve Texas’s application for primary permitting and enforcement responsibility (primacy) for carbon dioxide (CO2) sequestration wells pursuant to the Safe Drinking Water Act’s (SDWA) Class VI Underground Injection Control (UIC) Program. Upon approval of the rule, the Railroad Commission of Texas (RRC) will have permitting and enforcement authority for the Class VI UIC program (with oversight from the EPA). This development is the culmination of lengthy negotiations between the state of Texas and the EPA, which we have previously discussed in more detail.

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.

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.

The U.S. Environmental Protection Agency (EPA) has finalized regulations impacting a large swath of refrigeration and cooling equipment industries. The new regulations are the most recent EPA action addressing the use of hydrofluorocarbons (HFCs), greenhouse gases often used to replace ozone-depleting substances for refrigeration and cooling, under the American Innovation…

Phishing scams can pop up anywhere, as evidenced by the U.S. Environmental Protection Agency (EPA) Office of Inspector General’s recent alert regarding fraudulent Notice of Violation letters (NOVs).

According to the EPA, fraudulent NOVs have been sent by a fraudster through mail and email. The fake NOVs allege violations of…

On March 11, the U.S. Environmental Protection Agency (EPA) published the long-awaited Safer Communities by Chemical Accident Prevention Rule (Final Rule), which concluded a nearly decadelong process — spanning three administrations — to update EPA’s Risk Management Program (RMP) under the Clean Air Act (CAA).