EPA’s TSCA Pre-Prioritization Webinar

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On September 30, 2024, a lead toxicologist in the Data Gathering Management and Policy Division within the Office of Pollution Prevent and Toxics presented an overview of prioritization and pre-prioritization efforts for existing chemicals under the Toxic Substances Control Act (TSCA). The Agency’s goal was to collaborate with attendees to evaluate the potential risks of existing industrial chemicals regulated under TSCA. Topics covered included a high-level overview of TSCA authorities, requirements, and timelines for evaluating existing chemicals. Additionally, EPA covered the Agency’s approach for identifying the chemicals that may undergo prioritization.

Under TSCA, EPA is required to evaluate the potential risks of chemical substances comprehensively, taking into account their cradle-to-grave life cycle. This process involves assessing the chemical’s potential exposure and risks from production through disposal and includes all identified uses.  First, the webinar touched on the key aspects for the Risk Evaluation process.

  • Cradle-to-Grave Analysis
    • 6-Year Timeline for Risk Regulation
      • Initiation and Prioritization: 9-12 months.
      • Risk Evaluation: 3 to 3.5 years.
      • Regulation Development: Remainder of the timeline as needed.
  • Public Engagement and Information Gathering

EPA then noted that the prioritization process reflects the Agency’s evolving approach to addressing chemical risks efficiently and inclusively under TSCA. EPA identified 27 chemical substances that are being considered for prioritization under TSCA, focusing on their inclusion in the 2014 TSCA Work Plan, the interests of other agencies, and the availability of hazard and exposure data. The 2014 TSCA Work Plan identified approximately 90 chemicals as priorities for risk evaluation based on hazards, exposure risks, and their environmental or health impact. In addition, three chemical substances that were not listed in the 2014 Work plan are being considered for prioritization Two of these chemicals were identified through TSCA Section 21 petitions:  Hydrogen fluoride (HF) and 6PPD.  Bisphenol S (BPS) is also being considered for prioritization.  The Agency explained that BPS could become a priority if bisphenol A (BPA) undergoes prioritization, as BPS is a key alternative to BPA in the market.

EPA reminded participants that the Agency uses Section 4 and Section 8 under TSCA to gather data on the chemicals for prioritization, risk evaluation, and risk management. TSCA Section 4 provides authority for mandatory testing of chemicals to fill data gaps through test orders, test rules, and consent agreements. TSCA Section 8 allows for reporting and recordkeeping of existing chemical-related data, including reports of significant adverse health or environmental reactions.

The Agency noted that it prioritizes chemicals with robust existing data to streamline risk evaluation and reduce delays caused by insufficient information. The inclusion of both 2014 TSCA Work Plan chemicals and newly highlighted substances reflects intent to address historical priorities while also adapting to emerging concerns raised by stakeholders or other agencies.

 

Work Plan Chemicals:

1-Hexadecanol
2-Ethylhexyl
tetrabromobenzoate (TBB)
4-tert-Octylphenol (4-(1,1,3,3-Tetramethylbutyl)-phenol)
Benzene
bis(2-Ethylhexyl) – 3,4,5,6-Tetrabromophthalate (TBPH)
Bisphenol A
Creosote
Di-n-octyl phthalate (DnOP)
Ethylbenzene
Naphthalene
N-Nitroso-diphenylamine
p,p’-Oxybis(benzenesulfonylhydrazide)
Styrene
Tribromomethane
Triglycidyl isocyanurate
m-Xylene
o-Xylene
p-Xylene
Antimony & Antimony Compounds
Arsenic & Arsenic Compounds
Cobalt & Cobalt Compounds
Lead & Lead Compounds
Long-chain chlorinated paraffins (C18-20)
Medium-chain chlorinated paraffins (C14-17)

Non-Work Plan Chemicals:

Bisphenol S
Hydrogen fluoride
N-(1,3-Dimethylbutyl)-N’-phenyl-pphenylenediamine (6PPD)

DTSC Approves Preliminary Report on 6PPD Alternatives

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This August, the California Department of Toxic Substances Control (DTSC) approved a revised stage 1 alternatives analysis report for 6PPD (CASRN 793-24-8) from the U.S. Tire Manufacturers Association (USTMA).  The preliminary report identified seven potential 6PPD alternatives for use in tires, which will be further assessed in the stage 2 alternatives analysis report due in August 2026.

6PPD, or N-(1,3-Dimethylbutyl)-N’-phenyl-p-phenylenediamine, has been used as an anti-degradant in tires since about the 1950s.  In 2020, it was discovered that 6PPD has a transformation product, 6PPD-quinone, that is extremely toxic to salmon and other aquatic species.  According to USTMA’s website, the organization “is not aware of any new motor vehicle tires available today that do not contain 6PPD.”

The seven potential 6PPD alternatives identified by the preliminary report are 7PPD, IPPD, 77PD, CCPD, specialized graphene, octyl gallate, and Irganox 1520, selected based on available information on potential hazards, performance, and chemical and physical properties indicative of exposure potential.  7PPD, IPPD, 77PD, and CCPD come from the same chemical family as 6PPD.  Eliminating the use of 6PPD without replacement is not an option, according to the preliminary report.

The stage 2 alternatives analysis will include a “more in-depth evaluation of hazard and exposure potential,” including additional evaluation of potential transformation products.  “At the end of [stage 2], we are optimistic that we will have identified one or more possible alternatives that hold promise to replace or materially reduce 6PPD in motor vehicle tires,” the preliminary report states.

The initial report was revised due to a notice of deficiency issued by DTSC, which was described by USTMA as “a standard step in the alternatives analysis process” that allows “regulators to provide suggestions and seek clarification about certain parts of a preliminary submission.”  Octyl gallate and Irganox 1520 were added to the list of potential alternatives in the revised report.

DTSC added 6PPD to the list of Priority Products under California’s Safer Consumer Products Program effective October 2023, prompting the alternatives analysis.  The following month, EPA granted a Toxic Substances Control Act citizen petition requesting that EPA take action to prohibit its use in tires.  EPA has since proposed a data call for substances including 6PPD-quinone, discussed in a previous blog post.

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 Proposes to Request Unpublished Studies for 16 Chemicals

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On March 26, 2024, EPA published a proposed rule that would require manufacturers of sixteen chemical substances to submit a wide breadth of unpublished studies to the Agency.

If finalized, the rule would amend the list of chemicals subject to health and safety reporting located at 40 CFR 716.120 by adding the following:

  • 4,4-Methylene bis(2-chloraniline) (CASRN 101–14–4)
  • 4-tert-octylphenol(4-(1,1,3,3- Tetramethylbutyl)-phenol) (CASRN140– 66–9)
  • Acetaldehyde (CASRN75–07–0)
  • Acrylonitrile (CASRN 107–13–1)
  • Benzenamine (CASRN 62–53–3)
  • Benzene (CASRN 71–43–2)
  • Bisphenol A (CASRN 80–05–7)
  • Ethylbenzene (CASRN 100–41–4)
  • Naphthalene (CASRN 91–20–3)
  • Vinyl Chloride (CASRN 75–01–4)
  • Styrene (CASRN 100–42–5)
  • Tribomomethane (Bromoform) (CASRN 75–25–2)
  • Triglycidyl isocyanurate; (CASRN 2451–62–9)
  • Hydrogen fluoride (CARN 7664– 39–3)
  • N-(1,3-Dimethylbutyl)-N′-phenyl-pphenylenediamine (6PPD) (CASRN 793– 24–8)
  • 2-anilino-5-[(4-methylpentan-2-yl) amino]cyclohexa-2,5-diene-1,4-dione (6PPD-quinone) (CASRN 2754428–18– 5).

EPA proposed to prioritize five of the listed chemicals (underlined above) for TSCA section 6 risk evaluation in December 2023.  The proposed rule also includes 10 chemicals EPA is considering including in its December 2024 initiation of prioritization.  The last substance, a 6PPD transformation product, was included as a result of EPA’s decision to grant a citizen’s petition on 6PPD.

Pursuant to 40 CFR 716.10 and 716.50, the requested information would include studies on health and safety, environmental effects, physical-chemical properties, exposure, and degradation.  Copies of unpublished studies, lists of known unpublished studies not in the submitter’s possession, and lists of ongoing studies would all be required.  Copies of each study previously listed as ongoing would also be required upon completion, regardless of the study’s completion date.

Studies previously submitted to EPA pursuant to a requirement under TSCA would be exempted from the request.  However, EPA proposes not to apply the typical exemption for persons manufacturing one of the 16 substances only as an impurity.

In addition to current manufacturers (including importers), persons who have manufactured or proposed to manufacture a listed substance within the past ten years would be required to submit the requested information.  Comments on the proposed rule are due on May 28, 2024.

DuPont De Nemours Inc. Sues EPA Regarding GenX Test Order

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Earlier this year, the US Court of Appeal for the Third Circuit ordered EPA to provide documentation regarding the Agency’s decision to order DuPont De Nemours Inc. to provide information on GenX chemicals through two section 4 test orders under the Toxic Substances Control Act (TSCA). DuPont brought this case to challenge the testing requirements imposed on the company, asserting that EPA had incorrectly identified the company as a manufacturer of the chemicals identified in the test orders:  hexafluoropropylene oxide (also known as trifluoro(trifluoromethyl)oxirane) and 6:2 Fluorotelomer sulfonamide betaine, two GenX chemicals. The test orders required testing on the inhalation effects toxicity of the chemicals in order to enable EPA to further understand protentional risks posed to human health and the environment. In addition to the cost of the toxicity studies, the manufacturers subject to the orders were assessed a fee of $11,650 to be split evenly amongst them.

After receiving the order to provide documentation, EPA requested several time extensions, but eventually stipulated to an agreement dismissing the case. The motion filed in May 2023 released DuPont from the test orders on 6:2 fluorotelomer sulfonamide betaine and hexafluoropropylene oxide. The Court then dismissed the case.

New Study Finds Multiple Toxic Chemicals in Consumer Products

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This May, the American Chemical Society published a new study evaluating the presence of toxic chemicals in consumer products.  The study found use of at least one chemical known to the state of California to cause cancer, reproductive issues, and/or developmental issues in over one hundred types of consumer products.

The study’s authors used data from the California Air Resources Board’s (CARB) Consumer Product Regulatory Program, which collects data on volatile organic compounds (VOCs) in California consumer products.  They then cross-referenced this data against the list of harmful chemicals regulated under California’s Safe Drinking Water and Toxic Enforcement Act, commonly known as Proposition 65 or Prop 65, to determine the hazards posed by each product category.  It should be emphasized that the study provides only a partial picture of the use of hazardous chemicals in consumer products; only about 200 of the 865 Prop 65-listed substances are VOCs.

More than 100 product categories contained at least one VOC chemical listed under Prop 65 (a “listed chemical”).  Consumers were exposed to the greatest number of listed chemicals in categories that included personal care products, cleaners, and household products; for workers, adhesives had the greatest number of listed chemicals.  The study also determined that more than 5,000 tons of listed chemicals were released from California consumer products in 2020.

In general, the product categories with the most listed chemicals were also the categories in which exposures to especially hazardous listed chemicals were highest.  After comparing the product categories with the highest numbers especially hazardous chemicals with the categories with the highest potential exposures, the researchers assembled a list of 30 product categories and 11 especially hazardous chemicals—including formaldehyde and methylene chloride—that they believed should be prioritized for regulation.

In addition, the study noted that certain occupations put workers at particular risk of exposure to listed chemicals.  For example, janitors could be exposed to five prioritized product categories, including cleaners, detergents, and degreasers.  Construction workers, nail/hair salon employees, and automobile maintenance/repair workers were also described as particularly at-risk.

Because CARB only makes data available by product category, the study did not identify particular brands or products in their analysis.

Vinyl Institute Seeks Judicial Review of EPA Test Order

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Congress granted EPA new test order authority through the 2016 Lautenberg Amendments to the Toxic Substances Control Act (TSCA).  In May 2022, EPA received its first legal challenge to this new authority from the Vinyl Institute.  The Vinyl Institute is a coalition of seven companies which manufacture a solvent, 1,1,2-trichloroethane, that EPA listed as a priority chemical in December 2019 and that is currently undergoing risk evaluation.  The Vinyl Institute is seeking judicial review of a test order for 1,1,2-trichloroethane, for an avian reproduction test.  Specifically, the petition to the DC Circuit Court argues that EPA has not adequately explained the need for the data.  1,1,2-trichloroethane is used as a solvent and an intermediate in the production of 1,1-dichloroethane.  During the risk prioritization process, the Agency determined that it had insufficient data on the substance to understand if it has the potential to harm wildlife and issued the test order.

The Vinyl Institute stated in their petition that the Test Rule is arbitrary, capricious, and an abuse of discretion.  It alleges that EPA failed to:

  • Adequately explain why the avian reproduction test is necessary,
  • Consider all available information and data for the substance,
  • Cite reliable and representative information and data in support of the Test Order,
  • Adequately justify the need for the test without first requiring screening level testing, and
  • Consider the relative costs of the Test protocols, along with availability of facilities and personnel to perform the testing.

As of this date, the parties have filed motions regarding whether additional submission may be made to the record.

EPA Proposes to Stop Authorized Use of Certain PFAS in Pesticide Products

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EPA is proposing to remove 12 PFAS substances from the current list of inert ingredients approved for use in pesticide products. Under EPA’s 2021 PFAS Strategic Roadmap the Agency is reviewing substances approved as inert ingredients in pesticides and potentially taking action to limit their use. Inert ingredients in pesticides serve to increase effectiveness and product performance including improving the ease of pesticide application and extending shelf life.

The 12 chemical substances proposed for removal are no longer in any registered pesticide product, but EPA believes it is important to remove these chemicals.  This means that a review of available information for these chemicals would be required for their future use in pesticide products. In discussing the proposal Michal Freedhoff, EPA’s Assistant Administrator for the Office of Chemical Safety and Pollution Prevention stated, “ensuring that these 12 chemicals can no longer be used in pesticides is an important step to protect workers, the public, and our planet from unnecessary PFAS exposure.”

CoverGirl Cosmetics and Coty Inc PFAS Suit

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CoverGirl Cosmetics and Coty Inc. are facing a class action lawsuit for marketing their TruBlend Pressed Powder as sustainable and safe while allegedly it contained PFAS.  The complaint was filed in the U.S. District Court for the Southern District of California.  According to the complaint, independent lab testing found that the product contained increased fluorine levels, an indicator of the presence of PFAS.   The complaint also notes that defendants misrepresent the product in their marketing materials which state that they hold themselves to the highest quality standards when it comes to safety and efficacy of their products.  Plaintiffs argued that these acts violate the California Unfair Competition Law and the California False Advertising Law, and constitute fraud and negligent misrepresentation.

The plaintiff asserts that the presence of PFAS is a concern because PFAS exposure through inhalation, ingestion, and skin contact can result in PFAS entering the body. The makeup in question is applied directly to the face and is prolonged skin contact.  Plaintiff contends that PFAS are present at a greater concentration than recommended by the current EPA health advisory limit for safe consumption.

FDA Rejects Phthalate Petition

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On May 19, 2022, the US Food and Drug Administration (FDA) announced that it has denied two petitions to ban phthalates in food packaging.  In conjunction with denying the petitions, the FDA accepted a petition requesting that the Agency stops authorizing 23 phthalates for use in food containers as they are no longer used by industry.

In addition to being in food containers, phthalates are used as additives in cosmetics, detergents, and shower curtains.  Industry often uses them to soften plastics.  Although allowed in many products, the 2008 Consumer Product Safety Improvement Act bans a concentration of more than 0.1 percent of di-(2-ethylhexyl) phthalate (DEHP); dibutyl phthalate (DBP); or benzyl butyl phthalate (BBP) in all children’s toy and childcare articles.  Being exposed to concentrated amounts of phthalates can cause reproductive and developmental issues.

Multiple groups, including the Environmental Defense Fund and Earthjustice, have petitioned the FDA in the last decade to block the authorization of phthalates in food packaging, but the petitions have always failed, with the FDA citing a lack of information to justify blocking authorization of phthalates.

FDA’s acceptance of the petition to stop authorizing certain phthalates was due to the industry no longer using those substances. As the industry has abandoned use of those phthalates, the FDA found it appropriate to stop their authorization.  Currently, there are eight phthalates that the FDA still authorizes.  Shortly after the FDA’s announcement, they issued a request for information regarding current uses, levels, dietary exposure, and safety data for those phthalates.