Court Approves Tight Deadlines for Overdue Risk Evaluations

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The D.C. District Court has entered two consent decrees concerning over twenty overdue Toxic Substances Control Act (TSCA) risk evaluations, holding the incoming administration’s EPA to aggressive deadlines for completing the chemical reviews.

The consent decrees, approved November 22, concern 20 risk evaluations initiated by EPA in December 2019 and two manufacturer-requested risk evaluations initiated in January 2020.  None were completed within TSCA’s 3.5-year deadline.

Under the consent decrees, linked here and here, EPA will be required to complete:

  • Draft risk evaluations for six of the substances, including 1,3-butadiene, by December 31, 2024;
  • Final risk evaluations for TCEP, formaldehyde, 1,1-dichloroethane, and DIDP by December 31, 2024;
  • A final risk evaluation for DINP by January 15, 2025;
  • A draft risk evaluation for one of the remaining substances by March 31, 2025;
  • Final risk evaluations for seven of the substances, including 1,3-butadiene, by December 31, 2025; and
  • Final risk evaluations for the remaining 10 substances by December 31, 2026.

The deadlines are largely unchanged from those in the proposed consent decrees, released in April and discussed in a previous blog post.  Since then, EPA has released a final risk evaluation for TCEP and drafts for 1,1-dichloroethane, DINP, and 1,3-butadiene.  However, as it stands, EPA will be required to complete three more final risk evaluations before the end of 2025—and a fourth before the presidential transition.

Meanwhile, EPA looks likely to designate another five chemicals as “high priority” this December, automatically triggering new risk evaluations.  More on those chemicals can be found here.

EPA’s Draft Risk Evaluation of DINP Finds Minimal Risks, but Determines That the Phthalate Presents an Unreasonable Risk

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On August 30, 2024, EPA released its draft risk evaluation for diisononyl phthalate (DINP).  The draft risk evaluation determined that most uses of DINP under the Toxic Substances Control Act (TSCA) “do not pose risk to the environment or the general population.”

The draft only identified three uses that “raise concerns” out of 47 evaluated conditions of use.  However, EPA preliminarily found that DINP presents an unreasonable risk of injury to human health due to the agency’s “single risk determination” approach to risk evaluations.

Two of these three uses were found to raise concerns for workers: industrial use of adhesives and sealants and industrial use of paints and coatings, specifically in scenarios in which unprotected workers used high-pressure sprayers.  According to the draft, these uses could create high concentrations of DINP in mist that an unprotected worker could inhale.

The other use—use of DINP in construction and building materials that cover large surface areas—was found to raise concerns for consumers.  This use could result in young children inhaling DINP-containing dust that settles “onto vinyl flooring, in-place wallpaper, and carpet backing and [is] resuspended into the indoor environment,” the draft says.

The draft risk evaluation identified developmental toxicity and liver damage as potential health effects of these types of exposures.  DINP also has the potential to cause “phthalate syndrome,” a collection of adverse effects on the developing male reproductive system, EPA said.

According to EPA, DINP is primarily used as a plasticizer to manufacture flexible polyvinyl chloride, better known as PVC.  Data from the Chemical Data Reporting rule indicates that hundreds of millions of pounds of DINP are manufactured annually.

EPA initiated the risk evaluation process after a 2019 request from ExxonMobil Chemical Company to review DINP and its chemical relative diisodecyl phthalate (DIDP).  EPA only found one concerning condition of use in DIDP’s draft risk evaluation, which was released this May.

DINP is a category of chemical substances which include 1,2-benzene-dicarboxylic acid, 1,2-diisononyl ester (CASRN 28553-12-0) and 1,2-benzenedicarboxylic acid, di-C8-10-branched alkyl esters, C9-rich (CASRN 68515-48-0).

Amended TSCA requires EPA to issue a risk management rule to address any unreasonable risks found by the final evaluation.  Comments on the draft risk evaluation are due on November 4, 2024.

EPA Proposes to Designate Five Substances as High Priority

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On July 25, 2024, EPA published a notice proposing to designate a new batch of existing chemicals as high priority substances under section 6 of the Toxic Substances Control Act (TSCA).  TSCA section 6 requires EPA to continually designate existing chemicals as “high-priority” based on factors including hazard and exposure potential.  Once a high priority designation is made, EPA is required to conduct a risk evaluation and regulate the chemical if it is found to present an unreasonable risk.

If the notice is finalized as proposed, EPA would immediately initiate risk evaluations for the following five substances:

  • Vinyl Chloride (CASRN 75-01-4)
  • Acetaldehyde (CASRN 75-07-0)
  • Acrylonitrile (CASRN 107-13-1)
  • Benzenamine (CASRN 62-53-3)
  • 4,4’-methylene bis(2-chloroaniline) (MBOCA) (CASRN 101-14-4)

According to an EPA press release, vinyl chloride is a known human carcinogen linked to liver, brain, and lung cancer in exposed workers.  In the release, EPA stated that vinyl chloride’s health hazards helped motivate the passage of TSCA in 1976.

The press release noted that the other four substances are probable human carcinogens and that some pose other types of hazards, such as respiratory and reproductive harms.  All five substances are used to make plastic; vinyl chloride is mostly used to make polyvinyl chloride, better known as PVC.

EPA announced that it was beginning the process of prioritizing these chemicals in December 2023.  In that announcement, EPA also stated that that it “expects to initiate prioritization on five chemicals every year, which will create a sustainable and effective pace for risk evaluations.”

Comments on the notice are due October 23, 2024.

EPA Finalizes Changes to TSCA Risk Evaluation Procedures

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On May 3, 2024, EPA published a final rule amending the procedures for chemical risk evaluations under the Toxic Substances Control Act (TSCA).  The final rule is largely unchanged from the proposed rule, discussed in a previous Verdant Law blog post.

A key change in the final rule is the requirement that risk determinations end in a single risk determination rather than use-by-use determinations.  EPA previously referred to this approach as a “whole chemical” approach.  However, to address concerns that a single determination of unreasonable risk would mislead the public into believing that all uses present an unreasonable risk, EPA will no longer use the term “whole chemical.”  EPA additionally committed to “identify[ing] the conditions of use that significantly contribute” to the single determination.

Another important change reverts an EPA interpretation of TSCA to a previous interpretation.  EPA proposed that risk evaluations consider all conditions of use in 2017, but determined that the agency had discretion over conditions of use in the final regulation.  However, due to the Ninth Circuit’s 2019 decision in Safer Chemicals, Healthy Families v. EPA, the final rule now mandates the inclusion of all conditions of use in risk evaluations.

Other changes include the removal of the definitions of “best available science” and “weight of the scientific evidence” to allow the agency greater “flexibility to quickly adapt to and implement advancing scientific practices”; EPA’s decision to no longer assume use of personal protective equipment when calculating occupational exposure; and identification of “overburdened communities” as a potentially exposed or susceptible subpopulation.

The final rule, effective July 2, 2024, will apply to ongoing risk evaluations “only to the extent practicable.”

EPA Publishes Proposed Consent Decrees for Overdue Risk Evaluations

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EPA would be required to complete overdue risk evaluations by new deadlines if two proposed consent decrees, announced by EPA on April 26, 2024, are adopted.

Section 6(b)(4)(G) of the Toxic Substances Control Act (TSCA) requires EPA to complete risk evaluations within three years of initiation, with a six-month extension possible.  EPA has missed this 3.5-year deadline for 22 ongoing risk evaluations.  Twenty of these risk evaluations were initiated in December 2019 as a result of amended TSCA’s requirement that EPA designate 20 existing substances as “high-priority,” which automatically initiated risk evaluations.  The other two, which concern the substances DIDP and DINP, were requested by manufacturers.

The proposed consent decrees would resolve two consolidated lawsuits against the agency.  The first, brought by environmental groups, challenges EPA’s failure to complete all 22 overdue risk evaluations; a previous blog post on that case can be found here.  The American Chemistry Council filed the second, which only concerns the two manufacturer-requested risk evaluations.

Under the proposed consent decrees, linked here and here, EPA would be required to complete:

  • Draft risk evaluations for at least seven of the substances, including 1,3-butadiene, by December 31, 2024;
  • Final risk evaluations for DIDP, DINP, TCEP, formaldehyde, and 1,1-dichloroethane by December 31, 2024;
  • Final risk evaluations for seven of the remaining substances, including 1,3-butadiene, by December 31, 2025; and
  • Final risk evaluations for the remaining 10 substances by December 31, 2026.

Under the proposed decrees, EPA could file a motion to extend a deadline if the agency deems it necessary.  The proposed consent decrees also include a provision automatically extending these deadlines if the agency undergoes a lapse in appropriations.

Since the first lawsuit was filed in September 2023, EPA has completed draft risk evaluations for TCEP (more on that here) and formaldehyde.  However, EPA has yet to release draft risk evaluations for any of the other 22 overdue evaluations.

Comments on the proposed consent decrees are due May 28, 2024.

EPA Issues Draft Risk Evaluation for Flame Retardant TCEP

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EPA has preliminarily determined that tris(2-chloroethyl) phosphate (TCEP) presents an unreasonable risk to human health and the environment, according to its draft risk assessment of the flame retardant released on December 14, 2023.  Animal testing data revealed that exposure to TCEP may increase risk of kidney cancer and other cancers, and could harm neurological and reproductive systems, the draft states.

According to EPA, domestic production of TCEP has decreased by about 99 percent since 2014.  However, the agency notes that TCEP is still used in paints, coatings, and in certain aerospace applications, and that previously-manufactured products containing TCEP—such as fabrics, certain types of foam, and construction materials—may still be in use.  The draft also states that “TCEP may still be found in a wide range” of imported goods.

Because TCEP is mixed into materials rather than being chemically bonded, it can leach out of products, EPA said.  Infant and child exposure from mouthing consumer products containing TCEP was determined to present an unreasonable risk.  The agency also found unreasonable risk of health effects for breastfed infants, people who handle TCEP at work, people who inhale TCEP dust off consumer products, and people who eat TCEP-contaminated fish.

EPA determined that TCEP presents an unreasonable risk to the environment due to studies on chronic exposures in fish and sediment-dwelling organisms.  The draft identified a number of ways by which TCEP can enter the environment, including manufacturing processes, air emissions, and leaching from products and landfills.  Although TCEP is not considered bioaccumulative, it is persistent in the environment, EPA said.

The draft risk evaluation is open for public comment and will undergo peer review by independent scientific and technical experts starting in March 2024.  If EPA still concludes that TCEP presents an unreasonable risk after public comment and peer review, the Toxic Substances Control Act requires the agency to take steps to mitigate its risks.

EPA Proposes Changes to TSCA Risk Evaluation Procedures

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On October 30, 2023, EPA published a proposed rule altering the procedures for chemical risk evaluations under section 6 of the Toxic Substances Control Act (TSCA). The proposed rule revises the existing 2017 framework, which was adopted one year after Congress passed amendments to TSCA requiring EPA to evaluate whether existing chemicals that have been identified as “high priority” present an unreasonable risk of injury to health or the environment.

The rulemaking includes the following proposed changes:

  • The clarification that EPA will include all conditions of use (i.e., circumstances under which the chemical is “intended, known, or reasonably foreseen to be manufactured, processed, distributed in commerce, used, or disposed of”) in the scope of a risk evaluation.
  • The inclusion of all exposure pathways in the scope of a risk evaluation. EPA previously excluded exposure pathways covered under other EPA statutes in its risk evaluations for the first ten chemicals.
  • The removal of the definitions for “best available science” and “weight of the scientific evidence.” Though TSCA requires EPA to use the best available science and make decisions based on the weight of the scientific evidence at 15 U.S.C. 2625, EPA argues that the codification of these definitions inhibits the Agency’s ability to adapt to changing science.
  • The requirement that EPA make a single determination on whether the chemical presents an unreasonable risk. EPA initially made separate risk determinations for each condition of use in its risk evaluations for the first ten chemicals but later issued revised “whole substance” determinations.
  • The cessation of the consideration of “assumed” personal protective equipment (PPE) use when calculating exposure reduction due to PPE.
  • The addition of “overburdened communities” to the list of examples of potentially exposed or susceptible subpopulations.
  • A number of alterations to the process and requirements for manufacturer-requested risk evaluations.

The above changes would apply to all risk evaluations initiated on or after the date of the final rule.  For risk evaluations in progress on the date of the final rule, EPA expects to apply the changes “only to the extent practicable.”

The proposed clarification that EPA includes all conditions of use in the scope of a risk evaluation stems from the Ninth Circuit’s 2019 decision in Safer Chemicals, Healthy Families v. EPA. In the case, petitioners successfully challenged EPA’s exclusion of “legacy uses and associated disposals”—such as the use and future disposal of asbestos in previously installed insulation—from the scope of risk evaluations. Several of the other proposed changes would codify existing EPA practices introduced in 2021, including the requirement that risk evaluations end with a single determination rather than use-by-use determinations.

EPA requests public comments on all aspects of the proposed rulemaking. Comments are due on December 14, 2023.

EPA Releases Draft Supplement for 1,4-Dioxane

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In July 2023, EPA announced the release of a draft supplement to the Risk Evaluation for 1,4-dioxane for public comment and peer review.  1,4-dioxane is solvent used to manufacture other chemicals such as adhesives and sealants.  It is also used as a processing aid and laboratory chemical. In addition, some manufacturing processes, such as the process used for making commercial and consumer dish soaps, result in the chemical being present as a byproduct.

The draft supplement focuses on air and water exposure pathways that were not included in the 2020 Risk Evaluation.  The 2020 Risk Evaluation focused on health risks to workers, consumers, and the general public, but not from drinking water, the air, or exposure where 1,4-dioxane is present as a byproduct.  The omission was identified by the Scientific Advisory Committee on Chemicals (SACC) as an oversight.  The SACC informed EPA that failure to assess the risks posed to the general population from exposure to the chemical may present a risk to human health – with an emphasis on drinking water as an exposure pathway.

The draft supplement identified cancer risk estimates higher than 1 in 10,000 for 1,4-dioxane present as a byproduct and higher than 1 in 1 million for general population exposure scenarios associated with 1,4-dioxane in drinking water sourced downstream of release sites and in air within 1 km of releasing facilities.

The draft supplement did note that the risk estimates include inherent uncertainties and the overall confidence in specific risk estimates fluctuates.  However, the document also stated that the information is beneficial in helping the Agency make a determination on whether the chemical poses an unreasonable risk to people with occupational exposure, through sources of drinking water, and breathing air near release sites.

EPA Sued Over Delayed Risk Evaluations

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Environmental groups have filed a lawsuit against EPA for failing to complete risk evaluations for 22 substances that may cause harm to humans and the environment.

Under section 6 of the Toxic Substances Control Act, EPA is required to conduct risk evaluations on “high priority” existing substances to determine whether they pose an unreasonable risk to human health or the environment.  Section 6(b)(4)(G) requires EPA to complete risk evaluations “as soon as practicable, but not later than 3 years after” they are initiated, with a one-time six-month extension possible.

According to the complaint, EPA missed this statutory 3.5-year deadline for 22 ongoing risk evaluations which were initiated in 2019 and early 2020.  Plaintiffs allege that this delay harms their members, staff, and children by prolonging their exposure to substances with serious health risks and by depriving them of information about their exposures.

The complaint seeks declaratory and injunctive relief, requesting that the U.S. District Court for the District of Columbia set deadlines for EPA to complete the risk evaluations.

The case is Community In-Power and Development Association v. EPA, No. 1:23‑cv‑02715-DLF.

EPA Releases Final Scope Document for Manufacturer-Requested Risk Evaluation of D4

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On March 7, 2022, EPA published the final scope of the risk evaluation for octamethylcyclotetra-siloxane (D4). This risk evaluation may affect producers of goods comprised of and/or utilizing the following: adhesives, sealants, synthetic rubber, electrical equipment, appliances, paint, ink/toner, aircraft maintenance components, automotive care components, cleaning products, fabrics/textile products. This is not intended to serve as an exhaustive list. The publication of this risk evaluation originated from a request made by the American Chemistry Council’s Silicones Environmental, Health, and Safety Center (SEHSC). The scoping document addresses conditions of use, exposures, hazards, and potentially exposed or susceptible subpopulations.

Conditions of Use

Conditions of use for D4 risk evaluation can be sub-divided into the following life cycle stages: manufacturing, processing, distribution in commerce, industrial use, commercial uses, consumer uses, and disposal. EPA’s evaluation will address each of the aforementioned life cycle stages. Notably, processing is the most nuanced of these stages. Specifically, the processing stage is comprised of three subcategories: processing as a reactant; incorporation into formulation, mixture, or reaction product; and repackaging.

Exposures

In the forthcoming risk evaluation, EPA will evaluate human and environmental exposures as well as releases into the environment resulting from these conditions of use identified in the scoping document. The evaluation will contemplate the physical and chemical properties of D4; environmental fate and transport processes, exposure pathways, and potential human and environmental receptors; releases to the environment; environmental exposures (both aquatic and terrestrial); occupational exposures; consumer exposures; and general population exposures.

Hazards

Regarding environmental hazards, EPA will assess the following potential hazard effects of D4 to aquatic and terrestrial organisms including: absorption, distribution, metabolism, and excretion (collectively referred to as “ADME”), developmental, gastrointestinal, mortality, neurological, nutritional, metabolic, reproductive, and respiratory. The scoping document notes that D4 can degrade into dimethylsilanediol (DMSD) under certain environmental conditions. Accordingly, EPA has indicated that it may factor toxicity information regarding DMSD into its risk evaluation.

With respect to human health hazards, EPA intends to examine the relation of D4 exposure to the following: ADME, cancer, endocrine, gastrointestinal, hematological, immunology, hepatic, mortality, neurological, nutritional/metabolic, ocular/sensory, renal, reproductive, developmental, respiratory, and skin/connective tissue. The scope of EPA’s assessment of the human health hazards of D4 may also contemplate hazards associated with exposure to DMSD as mentioned above.

Potentially Exposed or Susceptible Subpopulations (PESS)

In accordance with the requirement of TSCA section 6, the following groups will be considered potentially exposed or susceptible subpopulations in the D4 risk evaluation: children, women who may become pregnant, workers, occupational non-users (ONU), consumers, bystanders, fence line communities, and indigenous and native populations. Environmental justice considerations will also be factored into the PESS analysis. These considerations will follow the best practices discussed within EPA’s Technical Guidance for Assessing Environmental Justice in Regulatory Analysis.