EPA Proposes Risk Management Rule for 1-Bromopropane

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On August 8, 2024, EPA published a proposed rule to restrict use of the solvent 1-bromopropane (1-BP) (CASRN 106-94-5).  The proposed rule is the result of the agency’s revised 2022 determination that 1-BP presents an unreasonable risk of injury to human health due to effects including neurotoxicity, developmental toxicity, and carcinogenicity.

According to EPA, 1-BP is used in a wide variety of applications, including “vapor degreasing, aerosol degreasing, adhesives and sealants, and in insulation.”  Data from the Chemical Data Reporting rule shows that annual production of the substance, also known as n-propyl bromide, increased from 15.4 to 25.8 million pounds between 2012 and 2015.  This increase was because 1-BP is “an alternative to ozone-depleting substances and chlorinated solvents,” according to a 2020 EPA risk evaluation.

Under the proposed rule, all consumer uses of 1-BP would be banned except for use in insulation.  EPA is also proposing to prohibit four industrial and commercial uses, including use in adhesives and sealants, dry cleaning solvents, and automotive care products.  EPA estimates that these banned uses represent about 3% of the current annual production of 1-BP.

Other industrial and commercial uses would be subject to a workplace chemical protection program (WCPP), which would implement an inhalation exposure concentration limit for 1-BP of 0.05 ppm as an eight-hour time weighted average.  Use of chemically resistant gloves would also be required for uses including manufacturing, processing, and disposal.

Notably, in an effort to protect fenceline communities, EPA is proposing to prohibit owners or operators from increasing releases of 1-BP to outdoor air to comply with WCPP requirements.

EPA is proposing staggered compliance dates for the prohibited uses, which would become effective in six months for manufacturers, nine months for processors, and in 12 months for distribution to retailers.  Non-federal entities subject to the WCPP would be required to conduct baseline airborne exposure testing within six months and ensure that the inhalation exposure limit is met within nine months.

1-BP was added to the Toxics Release Inventory list of reportable chemicals in 2015 and became the first addition to the list of hazardous air pollutants in 2022.  More on 1-BP’s addition to the list can be found in a previous blog post.

Comments on the proposed rule are due September 23, 2024.

PFDA IRIS Assessment Finalized Amid Ongoing PFAS Reviews

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This July, EPA released the final Integrated Risk Information System (IRIS) assessment for PFDA.  PFDA’s toxicological review is the third completed IRIS assessment for a PFAS.  Two additional assessments, for PFHxS and PFNA, are still in progress.

Consistent with the draft, the final PFDA assessment concluded that evidence indicates “PFDA exposure is likely to cause liver, immune, developmental, and male and female reproductive effects in humans, given sufficient exposure conditions.”  However, it had a higher maximum acceptable daily dose, known as an oral reference dose (RfD), than the draft assessment.

The draft’s lifetime and subchronic RfD was 4 x 10-10 mg/kg/day.  But the final RfD was 2 x 10-9, partially due to the use of different points of departure (or the dose at which an effect is first observed) for immune and developmental effects.

July also saw the release of the external peer review report for the PFHxS draft IRIS assessment, and external peer review meetings for the draft PFNA assessment took place from July 30 to August 1.  The most recent update to the IRIS Program Outlook, released in June, did not include expected release dates for the final PFHxS or PFNA assessments.

Following external peer review, EPA revises the assessment, conducts a final agency review, and holds a interagency science discussion before releasing the final version.  It took nine months for EPA to finalize the assessment for PFDA after releasing the external peer review report.

EPA finalized drinking water standards for PFAS including PFHxS and PFNA in May; more on that can be found here.  Additional information on the draft IRIS assessment for PFHxS is available in a previous blog post.

EPA Releases Second Version of Interim Guidance on PFAS Destruction and Disposal

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On April 8, 2024, EPA released the second version of its interim guidance on the destruction and disposal of PFAS and PFAS-containing materials.  The updated interim guidance builds on the initial guidance issued in 2020 by providing new recommendations for the management of PFAS-containing materials.

The updated interim guidance focuses on three categories of large-scale destruction and disposal technologies: underground injection, landfilling, and thermal treatment.  For each category, EPA identifies the technology with a lower potential for environmental release of PFAS when compared to other technologies within their category:

  • Permitted Class I non-hazardous industrial or hazardous waste injection wells (underground injection);
  • Permitted hazardous waste landfills (landfilling); and
  • Permitted hazardous waste combustors (thermal treatment).

However, each technology has drawbacks and is only suitable for certain types of PFAS-containing materials.  For example, EPA notes that new information suggest landfills may release more PFAS into the environment than previously understood, and that transportation logistics may limit the types and amounts of PFAS-containing fluids that can be inserted into Class I wells.

EPA emphasizes the limitations of available data and includes a list of prioritized research needs to inform future guidance.  High-priority research needs include information on releases from landfills and data on releases from thermal treatment units.  EPA describes a new analytical method, OTM-50, that it believes will better characterize the products of incomplete combustion.

In addition, the updated interim guidance presents a new evaluation framework designed to assess emerging technologies and determine their suitability for specific PFAS-containing materials. It also includes an updated list of tools to screen for potentially vulnerable populations living near likely PFAS destruction or disposal sites.

EPA was mandated to publish and triennially update the interim guidance by the FY 2020 National Defense Authorization Act.  More information on the updated interim guidance can be found in an EPA fact sheet.

Comments on the updated interim guidance are due October 15, 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.

Kansas City Grocers Ordered to Stop Selling Illegally-Imported Disinfectants

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On May 6, 2024, EPA Region 7 announced that 17 grocery stores in the Kansas City area had been ordered to stop the sale and use of certain Fabuloso-brand cleaners and other disinfectants because of potential health risks.  The orders, issued by the Kansas and Missouri Departments of Agriculture in partnership with EPA, require the stores to immediately remove the illegal products from their shelves.

According to EPA’s press release, the products contain glutaraldehyde, an active ingredient not approved for household disinfectant use in the U.S. due to its potential health risks. These risks include “throat and lung irritation, asthma and difficulty breathing, dermatitis, nasal irritation, sneezing, wheezing, burning eyes, and conjunctivitis.”

EPA says that the products were illegally imported.  The press release states that their labels are primarily in Spanish and that the affected grocers “serve Hispanic communities.”

It is important to note that not all Fabuloso products are unsafe.  There is also an EPA approved US version of Fabuloso which does not contain glutaraldehyde.  According to the press release, some stores subject to the orders sold both the illegal and the approved US versions of the disinfectants.

EPA Grants Petition to Address PFAS Created by Plastic Fluorination

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On July 10, 2024, EPA granted a citizen petition from environmental groups encouraging EPA to take Toxic Substances Control Act (TSCA) section 6 action for three PFAS substances produced during the fluorination of plastic containers.

The petition alleges that the three PFAS—PFOA, PFNA, and PFDA—pose a variety of serious human health hazards, even at extremely low exposures.  The petition cites EPA’s December 2023 response to significant new use notices filed by Inhance Technologies (“Inhance”), a fluorination company, for substances including PFOA, PFNA, and PFDA.  As discussed in a previous blog post, EPA found that Inhance’s production of the three PFAS presents an unreasonable risk and ordered Inhance to stop producing the chemicals under TSCA section 5, which allows EPA to regulate new substances and significant new uses.

Inhance challenged EPA’s order.  In March, the Fifth Circuit ruled that EPA could not regulate Inhance under TSCA section 5 because Inhance’s fluorination process had been in place for decades; a blog post on the decision can be found here.  However, the court noted that EPA is free to regulate Inhance’s fluorination process under section 6, which allows EPA to restrict existing substances.  Unlike section 5, section 6 requires EPA to conduct a cost-benefit analysis that considers a substance’s benefits and what the economic consequences of regulation would be.

In its letter granting the petition, EPA said that the agency will initiate “an appropriate proceeding under TSCA Section 6 associated with the formation” of the three PFAS during plastic container fluorination.  As part of the proceeding, “EPA intends to request information, including the number, location, and uses of fluorinated containers in the United States; alternatives to the fluorination process that generates PFOA, PFNA, and PFDA; and measures to address risk from PFOA, PFNA, and PFDA formed during the fluorination of plastic containers.”

EPA Proposes to Restrict Use of N-Methylpyrrolidone

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Multiple occupational uses of n-methylpyrrolidone (NMP) would be banned and others would be restricted under a proposed rule published by EPA on June 14, 2024.  The proposed rule follows EPA’s 2020 determination that NMP presents an unreasonable risk to human health due to health effects including fetal death and reduced fertility.

According to the proposed rule, NMP is a widely used solvent with applications in the manufacturing of lithium-ion batteries, “semiconductors, polymers, petrochemical products, paints and coatings, and paint and coating removers.”  2020 Chemical Data Reporting rule data indicates that total annual production ranged from 100–250 million pounds from 2016 to 2019, EPA says.

The proposed rule would ban the manufacture, processing, distribution, and use of NMP for industrial and commercial use in lubricants, anti-freeze products, automotive care products, and cleaning products, among others.  All industrial and commercial uses not prohibited would be subject to a workplace chemical protection program (WCPP) to minimize direct dermal contact with NMP through incorporation of the hierarchy of controls.  Where controls are insufficient, EPA proposes to require implementation of a PPE program.

The proposed rule would also implement prescriptive controls for certain industrial and commercial uses, such as capping the allowed concentration of NMP in industrial and commercial paints and stains at 45%. Similar concentration maximums would apply to a handful of consumer products, including adhesives.

Although no consumer products would be banned, EPA proposes to implement container size limitations and labelling requirements for some consumer uses, including paint removers, paints, automotive care products, and cleaning products.

EPA proposes that the bans take effect under a staggered schedule, varying from one to two years after publication depending on whether an entity is a manufacturer, processor, distributor, or user of NMP.  Private entities subject to WCPP requirements would have one year to establish the program, and consumer product container size limitations and labelling requirements would also take effect after one year.

Comments on the proposed rule are due on July 29, 2024.

EPA Tightens Emissions Standards for Chemical Plants

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The synthetic organic chemical manufacturing industry and some polymer manufacturers will face more stringent emissions limitations under a final rule published by EPA on May 16, 2024.  The rule primarily targets emissions from chloroprene and ethylene oxide, which are linked to cancer in humans.

The final rule amends the National Emissions Standards for Hazardous Air Pollutants and New Source Performance Standards for these facilities, which number about 200.  Emissions limitations include requirements to improve flare efficiency and stronger standards for heat exchange systems, process vents, and storage vessels.

According to an EPA fact sheet, covered facilities “must meet risk-based requirements for reducing [ethylene oxide] within two years after the rule becomes effective and must meet risk-based standard for reducing chloroprene within 90 days after” the rule takes effect July 15, 2024.

The final rule also mandates fenceline monitoring for facilities that use, produce, store, or emit chloroprene, ethylene oxide, benzene, 1,3-butadiene, ethylene dichloride, or vinyl chloride.  Neoprene production facilities will be subject to lower action levels for chloroprene and shorter compliance deadlines than other facilities.

Previous EPA regulations had included general exemptions from emission control requirements during periods of startup, shutdown, and malfunction.  The final rule eliminates those exemptions, which courts have deemed impermissible under the Clean Air Act.

In a press release, EPA stated that the final rule will reduce ethylene oxide “and chloroprene emissions from covered processes and equipment by nearly 80%,” reducing “the number of people with elevated cancer risk by 96% in communities near plants that emit” those chemicals.

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 Sets Drinking Water Standards for PFAS

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Concentrations of six PFAS substances in drinking water will be regulated for the first time under new drinking water standards published by EPA on April 26, 2024.

The final rule sets individual maximum contaminant levels (MCLs) for PFOA and PFOS at 4 parts per trillion (ppt).  The agency found no evidence that any level of exposure to either substance is safe, setting aspirational maximum contaminant level goals (MCLGs) of 0 ppt for both.

The final rule also sets individual MCLs (and MCLGs) of 10 ppt for PFHxS, PFNA, and HFPO-DA (known by the trademark GenX).  Mixtures containing two or more of PFHxS, PFNA, HFPO-DA, and PFBS are subject to a hazard index-based limit.

Public water systems are required to conduct initial monitoring by April 2027, be compliant with the MCLs by April 2029, and conduct regular compliance monitoring.  Water systems must include detected PFAS in their annual reports and notify the public if a MCL violation has been detected.

EPA characterizes the regulation as flexible.  The final rule allows reductions in initial monitoring for most small water systems, using previously collected drinking water data to satisfy initial monitoring requirements, and reduced compliance monitoring based on sampling results.  Additionally, the final rule does not dictate how PFAS be removed.

In a press release, EPA said it expects that approximately 6-10% of water systems subject to the final rule may need to take action to meet the standards, reducing PFAS exposure for around 100 million Americans.

A previous Verdant Law blog post on the proposed drinking water standards can be found here.