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On December 22, 2022, EPA’s Integrated Risk Information System (IRIS) Program released its ORD Staff Handbook for Developing IRIS Assessments (IRIS Handbook). EPA began working on the approaches in the IRIS Handbook after a 2011 National Research Council report recommended several improvements to the overall IRIS assessment process. In 2020, EPA released a draft IRIS Handbook for public comment and commissioned a peer review by the National Research Council.

Established in 1985 to ensure Agency-wide consistent toxicity evaluations, IRIS assessments provide chemical toxicity values for noncancer and cancer human health effects resulting from chronic exposure to chemicals. These values are often utilized in EPA regulations under the Clean Air Act (CAA), the Safe Drinking Water Act (SDWA), and the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA). While chemical risk evaluations conducted under the Toxic Substances Control Act (TSCA) require more information and analysis than that provided by an IRIS assessment, IRIS assessments will likely continue to be used to inform TSCA risk evaluations. State agencies and international bodies also rely on IRIS assessments.Continue Reading EPA Finalizes its Long-Awaited IRIS Handbook Updating a Number of Key Elements

On June 15, 2022, the United States Environmental Protection Agency (EPA) released drinking water health advisories [1] for certain per- and polyfluoroalkyl substances (PFAS), resulting in the establishment of:

  1. Near zero updated interim advisory levels for Perfluorooctanoic acid (PFOA) and Perfluorooctane sulfonic acid (PFOS) that are not only orders of magnitude below previously established levels, but that are also below detectable levels and, notably, were issued in advance of completion of peer review by EPA’s Science Advisory Board (SAB); and
  2. Newly issued final advisories at low levels for GenX and PFBS chemicals that have been used as replacement chemicals for PFOA and PFOS.

Continue Reading EPA Issues Near Zero Drinking Water Health Advisories for Certain PFAS

A recent federal district court decision shows how a consent decree can provide protection to responsible parties under CERCLA by precluding later-filed tort claims seeking additional relief or different remedial action.
Continue Reading Federal Court Finds Tort Claims Preempted by CERCLA Consent Decree

Last week, in Residents of Gordon Plaza, Inc. v. Cantrell, the Fifth Circuit denied a petition for rehearing en banc of a recent decision affirming the dismissal of a Resource Conservation and Recovery Act (RCRA) citizen suit. The key issue in the underlying appeal, 25 F.4th 288 (5th Cir. 2022), was whether certain maintenance activities qualify as a “removal” action under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA). The court affirmed that the maintenance activities do indeed constitute a “removal action.” Therefore, the suit was barred under 42 U.S.C. § 6972(b)(2)(B)(iv), which precludes RCRA citizen suits where a “responsible party is diligently conducting a removal action” pursuant to a CERCLA consent decree with EPA.
Continue Reading Fifth Circuit Endorses Broad Reading of “Removal” Under CERCLA To Bar RCRA Citizen Suit

11.22.21 Last week, EPA transmitted four important documents to the EPA Science Advisory Board (SAB) for peer review that included updated health assessments for perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS). This peer review, which will start on December 16, will inform EPA’s development of a Maximum Contaminant Level (MCL) Goal and a future, legally enforceable National Primary Drinking Water Regulation for PFOA and PFOS under the Safe Drinking Water Act. As noted in the PFAS Strategic Roadmap: EPA’s Commitments to Action 2021-2024, EPA intends to release a proposed drinking water regulation for PFOA and PFOS in fall 2022. These scientific documents will provide the underpinnings for that important regulation.
Continue Reading ICYMI: EPA Takes a Big Science Step Towards Setting a Drinking Water Standard for PFOA and PFOS and the Implications Are Much Broader

Earlier this month, the Supreme Court granted a petition for certiorari in Guam v. United States (No. 20-382), a case involving liability under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA). The case gives the Court an opportunity to better delineate the boundary between “cost recovery” claims under section 107, and “contribution” claims under section 113. See 42 U.S.C. §§ 9607, 9613(f). The Court will specifically address what kinds of settlement agreements trigger a section 113 contribution claim and its corresponding three-year statute of limitations.
Continue Reading Supreme Court grants Certiorari in Guam CERCLA Case

Last month, the Supreme Court held oral argument in a case that addressed cleanup obligations for potentially responsible parties (PRPs) at Superfund sites. In Atlantic Richfield Company v. Christian, a company tasked with remediating one of the nation’s largest Superfund sites is urging the Supreme Court to overturn a Montana Supreme Court decision that permitted residents to sue the company for additional restoration damages, despite its ongoing cleanup efforts under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA).
Continue Reading Supreme Court Considers Landowner Rights in Superfund Case

On March 15, 2019, the House Subcommittee on Environment and Climate Change held a hearing titled, “Protecting Americans at Risk of PFAS Contamination & Exposure.” The hearing examined approaches to eliminate or reduce environmental and health risks to workers and the public from per- and polyfluoroalkyl substances (PFAS). At the hearing, there was discussion of proposed PFAS Legislation.
Continue Reading House Conducts PFAS Hearing

The Comprehensive Environmental Response, Compensation and Liability Act (CERCLA), commonly referred to as the Superfund law, directed the United States Environmental Protection Agency (EPA) to create a list of the country’s most hazardous waste sites. Sites are proposed to be placed on this “National Priorities List” (or NPL as it is known to environmental law professionals) if they exceed a certain risk score, or Hazard Ranking, and added to the List if the ranking is confirmed after a formal notice-and-comment process. A detailed set of regulations called the National Contingency Plan (NCP) governs how sites placed on the NPL will be investigated, alternative remedies evaluated, and a final remedy selected and then implemented. The NPL, the NCP, and various EPA guidance memoranda have established what practitioners acknowledge is an imperfect but generally workable process in which EPA and states work with potentially liable parties to manage cleanups at NPL sites.
Continue Reading EPA’s Superfund “Emphasis List” : Some New Questions

On May 18, the DC Circuit vacated a decision by EPA to place an Indianapolis site on the National Priorities List because the agency had ignored evidence contradicting facts underlying its listing decision. Although it is rare for a court to overturn an NPL listing, the case is a reminder that an administrative rulemaking must be based on substantial evidence, even when the agency has substantial discretion to evaluate the factual record.
Continue Reading Genuine Surprise: DC Circuit Overturns NPL Listing Decision