By Lisa M. Campbell and James V. Aidala
On April 8, 2019, the Agency for Toxic Substances and Disease Registry (ATSDR) announced the opening of a docket on the draft toxicological profile for glyphosate. 84 Fed. Reg. 13922. ATSDR seeks comments and additional information or reports on studies about the health effects of glyphosate for review and potential inclusion in the profile. Comments are due by July 8, 2019.
The draft profile includes a chapter on glyphosate’s potential for human exposure, which states the following in the overview:
- “Glyphosate has not been identified in any of the 1,832 hazardous waste sites that have been proposed for inclusion on the [U.S. Environmental Protection Agency (EPA)] National Priorities List (NPL) (ATSDR 2015). However, the number of sites evaluated for glyphosate is not known.”
- “Occupational and residential exposure is a result of glyphosate’s use in agricultural, nonagricultural, industrial, and residential settings. The highest potential for dermal, inhalation, and ocular exposure is expected for pesticide applicators, farm workers, and home gardeners who use herbicides containing glyphosate.”
- “The general population is exposed to glyphosate via ingestion of crops, plants, and foods with residues of this chemical. Residential exposure may occur via inhalation, dermal contact, and/or ocular contact during mixing or application of consumer products containing glyphosate or by coming into contact with crops, soils, or water to which glyphosate-containing products have been applied.”
- “Occupational exposure to glyphosate may occur via inhalation, dermal contact, and/or ocular contact during manufacture, transport, mixing, loading, application, and disposal processes. Accidental oral exposure may occur via unintentional ingestion. Dermal contact appears to be the major route of exposure to glyphosate for individuals involved in its application.”
- “Glyphosate mainly enters the environment as a direct result of its herbicidal use. Fate of this chemical in the environment includes degradation, transport, and partitioning processes, which are governed by its physicochemical properties and by abiotic or biotic degradation under certain environmental conditions. Glyphosate is a nonvolatile, highly polar, non-residual herbicide that has low potential for environmental persistence and is unlikely to bioaccumulate.”
ATSDR’s draft profile and the peer review which will follow can be expected to become part of the larger debate about the potential risks of glyphosate. Meanwhile, EPA continues its work on the registration review of the herbicide. In 2017, EPA evaluated the carcinogenic risk of glyphosate, and released its draft human health and ecological risk assessments. See our December 19, 2017, blog item EPA Releases Draft Human Health and Ecological Risk Assessments for Glyphosate for Public Comment for more information. After the public comment period for the draft human health and ecological risk assessments ended in April 2018, EPA officials have stated they hope to complete the registration review sometime this year.
By James V. Aidala and Margaret R. Graham, M.S.
On March 21, 2019, the U.S. Environmental Protection Agency (EPA) announced it was updating its Residual Time to 25% Bee Mortality (RT25) Data Table with information it has collected since the table was first published in 2014. EPA states that the “RT25 data help farmers and beekeepers know about how long a specific pesticide may remain toxic to bees and other insect pollinators following foliar application to crops,” and the new data “reflect the results of studies the agency has analyzed as part of [its] routine pesticide regulatory activities.” One example that EPA provides regarding how this new data will work is that farmers can now “choose pesticides that quickly lose their toxicity to bees,” and that applying the products in the evening “helps ensure that by morning the pests have been dealt with and blooming crops are safe for bees.”
EPA states that RT25 values are a function of a number of factors including application rate, physical-chemical properties, dissipation, crop, and pesticide formulation. The values provided were compiled from registrant-submitted data submitted to fulfill the data requirement for Honey Bee (Apis mellifera) Toxicity of Residues on Foliage study (OCSPP Guideline 850.3030). EPA states that the honey bee toxicity of residues on foliage study “is a laboratory test designed to determine the length of time over which field weathered foliar residues remain toxic to honey bees, or other species of terrestrial insects” and, depending on the chemical tested, “either the technical grade active ingredient or a specific formulation was tested using either the honey bee, alfalfa leaf cutting bee, or alkali bee.” The data table lists the test material, the species tested, and the plant species on which residues were aged.
EPA plans to update the table annually as it collects additional data going forward. More information on EPA’s actions intended to protect pollinators is available on EPA’s website.
In addition to providing the residual toxicity values, the table also illustrates the wide range of toxicity values among the various pesticides. RT25 times for the different active ingredients can range between a few and over 500 hours to reach the RT25 threshold. Even different formulations using the same active ingredient can have a significant difference in toxicity values. This illustrates the importance of reading the specific label instructions for a pesticide, even one that might be generally familiar to the user.
EPA’s publication of this information online also imposes a duty for EPA to continually update the table, especially to capture any changes in the information appearing in an earlier listing of the data. If, upon further review or later data submissions there are changes to the table for a product, EPA will need to alert users to potentially important changes in the information. Again, this illustrates the need for reading the label for each pesticide at the time of application, since some important information may have changed.
By Lisa M. Campbell and Lara A. Hall, MS, RQAP-GLP
By Lisa M. Campbell and Lisa R. Burchi
On March 8, 2018, the U.S. Environmental Protection Agency (EPA) announced its release of final guidance clarifying where first aid statements should appear on the label of pesticide products. EPA also posted a response to public comments. Links to the final guidance and to the response to public comments documents are below:
EPA states that it was prompted to develop this guidance when it learned “that there was a discrepancy in how the ‘location of first aid statement,’ per [40 C.F.R. Section 156.68(d)] is interpreted by EPA and those in the pesticide registrant community.” EPA notes that its review and approval of pesticide labeling is generally of a “master” label and thus does not always include a review of the location or placement of specific language on a label.
On December 7, 2016, EPA posted a memorandum for public comment entitled “EPA’s Guidance for Pesticide Registrants on Location of the First Aid Statement and Clarification on Definition of Label ‘Panel’ per 40 CFR 156.68” to clarify the interpretation of the term “panel” in the context of 40 C.F.R. 156.68 and to clarify where first aid statements must appear on pesticide labels, based on their Toxicity Category.
In its final guidance, EPA states it “will continue to require that Toxicity Category I products have the first aid statements on the front panel except in cases where a variation has been approved.” Further, based on comments received and the wide reliance by the regulated community on the interpretation that “any panel” includes inside panels, EPA is changing its position from its 2016 memorandum and now “will not require Toxicity Category II and III products to bear the first aid statements on a visible front, back or side panel.”
EPA also listed three recommendations for registrants to consider when printing their container labels:
- For Toxicity Category I products, EPA strongly recommends that registrants consider placing duplicative first aid language on the very back page of the booklet/accordion/saddle stitch label that is immediately “stuck” to the container in case the booklet/accordion/saddle stitch label is accidentally removed.
- Regardless of whether a registrant chooses to place the first aid statements for Toxicity Categories II and III products on a visible front, back, side or inside panel, EPA recommends that duplicative first aid language appear on the very back page of the booklet/accordion/saddle stitch label that is immediately attached to the container in case the booklet/accordion/saddle stitch label is accidentally removed. EPA states that this recommendation is not intended to suggest other information that registrants typically include on the very back page should be moved elsewhere.
- EPA recommends that the registrant community consider designing new booklets/accordion/saddle stitch labels that are not easily removed from the containers. Per 40 C.F.R. Part 156.10(a)(4), the labels are to be “securely attached” to the immediate container of the pesticide product. EPA believes that in many instances these labels are easily removed which is why, EPA states, it believes many registrants have already chosen to put the duplicative first aid statements on the very last page of the label that is attached to the container.
Registrants should review this guidance carefully, as this issue has been the subject of concern and controversy for a number of registrants.
By Lynn L. Bergeson, Karin F. Baron, and Margaret R. Graham
On December 20, 2016, the U.S. Environmental Protection Agency (EPA) announced the start of a pilot program to evaluate the usefulness and acceptability of a mathematical tool (the GHS Mixtures Equation), which is used in the Globally Harmonized System of Classification and Labeling of Chemicals (GHS). EPA states that the goal of the pilot program is to “evaluate the utility and acceptability of the GHS Mixtures Equation as an alternative to animal oral and inhalation toxicity studies for pesticide formulations.”
For this pilot program, EPA is requesting submission of acute oral and acute inhalation toxicity study data paired with mathematical calculations (GHS Mixtures Equation data) to support the evaluation of pesticide product formulations; instruction for doing so are available on the GHS Equation Pilot Program webpage, and Guidance on the GHS Mixtures Equation is available in the Guidance on the Application of the CLP (Classification, Labeling and Packaging) Criteria.
The program is an interesting approach considering the conceptual differences of risk assessment and hazard determination that exist at the core of EPA risk approaches and GHS fundamentals. Also, the definition of the EPA Categories compared to GHS has been problematic for hazard communication applications.
Mixture calculation tools rely on the availability of data for all components and would only be applicable if the data for each were generated using the same species under similar exposure conditions.
This pilot program is being developed under EPA’s initiative to develop non-animal alternatives for acute toxicity testing, as well as EPA’s Office of Pesticide Programs’ Strategic Vision for Adopting 21st Century Science Methodologies. More information on these initiatives can be found on our Pesticide Law and Policy blog under key phrase “toxicity testing.”
By Lisa M. Campbell and Timothy D. Backstrom
On July 5, 2016, a three judge panel of the U.S. Court of Appeals for the Ninth Circuit issued a brief opinion denying a petition for review of a U.S. Environmental Protection Agency (EPA) order in which EPA declined to “immediately adopt interim prohibitions on the use of toxic drift-prone pesticides … near homes, schools, parks, and daycare centers or wherever children congregate.” Petitioners Pesticide Action Network North America (PANNA), United Farm Workers, and Pineros y Campesinos Unidos del Noroeste (PANNA, et al.) filed an administrative petition in 2009 asking EPA to conduct pesticide-specific drift assessments and to impose interim buffer zones to protect children from pesticide drift.
The Circuit Court agreed with EPA’s contention that the petitioners do not have jurisdiction to review the reregistration and tolerance determinations previously made by EPA pursuant to the Food Quality Protection Act (FQPA), because such challenges are now time barred. EPA agreed with the petitioners that it should consider potential risks from spray drift as part of the registration review under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA). The petitioners argued that EPA had thereby acknowledged legal error when it previously reregistered food-use pesticides, but EPA has vigorously contested that premise. In 2014, EPA issued a proposal describing the methodology for assessing risk from pesticide drift that EPA will use prospectively in making registration review decisions.
The petitioners requested that EPA adopt interim relief by imposing uniform buffer zones for all pesticides that are registered for application by ground sprayers, broadcast, or aerial application, and that may cause certain human health effects. EPA rejected this request for across-the-board buffer zones as unscientific and inefficient and likely to result in a misallocation of EPA resources. The Circuit Court concluded that “substantial evidence” supports EPA’s decision to deny this interim relief, stating that “[t]he record suggests that the risk of exposure to pesticide draft depends on a number of factors, including pesticide toxicity, the method of application, the size of pesticide droplets, and weather conditions,” and “adequately supports EPA’s conclusion that the imposition of uniform buffer zones is not the most ‘scientifically appropriate’ method for mitigating the risk of exposure to pesticide drift.”
The Circuit Court has clearly recognized that uniform buffer zones like those sought by the petitioners would not be “scientifically appropriate.” While this decision is both welcome by industry and constructive, the evaluation of potential exposure and risk from pesticide drift during the registration review process for individual pesticides will likely remain controversial.
More information on EPA’s spray drift policy is available in our memorandum Spray Drift and Volatilization: Issues to Navigate Carefully as EPA Develops Registration Review Decisions.
By Lisa M. Campbell and Margaret R. Graham
On March 17, 2016, the U.S. Environmental Protection Agency’s (EPA) Office of Pesticide Programs (OPP), announced in an open letter to stakeholders, that it has developed new tools to “enhance the quality of its risk assessments and risk management decisions and better ensure protection of human health and the environment from pesticide use.” These tools have been developed as part of EPA’s efforts to implement OPP’s Strategic Vision for Adopting 21st Century Science Methodologies (Strategic Vision) initiative. As part of this initiative, OPP released two guidance documents:
- Final Guidance: Process for Establishing & Implementing Alternative Approaches to Traditional In Vivo Acute Toxicity Studies. OPP states that this guidance will “expand the use of alternative methods for acute toxicity testing” and “describes a transparent, stepwise process for evaluating and implementing alternative testing methods (not using live animals) for acute oral, dermal and inhalation toxicity, along with skin and eye irritation and skin sensitization.”
- Draft Guidance: Retrospective Analysis & Guidance for Waiving Acute Dermal Toxicity Tests for Pesticide Formulations. OPP states that this draft guidance “to waive all acute lethality dermal studies for formulated pesticide products” was developed through an analysis “across numerous classes representing conventional pesticides, antimicrobials, and biopesticides [that] examined the utility of the acute dermal toxicity study for formulations in pesticide labelling for end-use products.”
Comments on the draft guidance for waiving acute dermal toxicity tests are due May 16, 2016. The National Research Council’s 2007 report, Toxicity Testing in the 21st Century: A Vision and a Strategy, instigated OPP’s Strategic Vision initiative. EPA states that these guidance documents are significant steps in the report’s implementation and intended to reduced animal testing.
By Susan Hunter Youngren, Ph.D., James V. Aidala and Lisa M. Campbell
The Environment Protection Agency (EPA) extended the comment date on its draft guidance, Pesticide Cumulative Risk Assessment: Framework for Screening Analysis, in a Federal Register notice published on August 28, 2015. EPA’s draft framework provides guidance on how the EPA will screen groups of pesticides for cumulative evaluation. EPA proposes using a two-step approach, beginning with the evaluation of available toxicological information and, if necessary, followed by a risk-based screening approach. This framework supplements the existing guidance documents for establishing common mechanism groups (CMG) and conducting cumulative risk assessments (CRA). Additionally, EPA is also seeking comments on a draft copy of the human health risk assessment where the cumulative assessment was conducted in conjunction with pending actions for abamectin.
EPA has described a process that is data intensive and that requires sophisticated knowledge and modeling. EPA acknowledges that “the level of refinement provided by this approach is not necessary or even feasible for all existing pesticide classes.” The policy documents for conducting the first step in the process, “developing CMGs,” are still being refined.
This document provides the guidance for screening information to identify candidate CMGs and does not outline how actually to conduct CRAs. Rather, this document relies on policies and principles provided in other documents found on the EPA cumulative risk assessment website. These additional policies and principles were developed during the conduct of five CRAs for chemical groups such as the organophosphates and carbamates.
One of the major questions raised by the issuance of this document is the extent of the information that EPA will require for each chemical to determine if there are CMGs. The five CMGs currently assessed have relatively well defined mechanisms of action. It is not clear, however, what EPA will consider to be adequate justification that there are no other chemicals with the same mechanism of action for other chemicals of concern.
Requirements for EPA to determine and assess the risks of possible common mechanism of action among groups of similar pesticides was one of the most far-reaching new requirements imposed by the Food Quality Protection Act. Some observers expected a larger impact on pesticide use than what has occurred to date; whether EPA’s new approach results in more groupings or otherwise leads to restrictions on more groups of pesticides remains to be seen.
Comments on the draft guidance are due September 28, 2015. More information regarding EPA’s assessment of pesticide cumulative risk is available online.
By Lisa M. Campbell and Jane S. Vergnes, Ph.D.
On June 19, 2015, the U.S. Environmental Protection Agency (EPA) announced a plan for incorporating validated high throughput assays and a computational model into the Endocrine Disruptor Screening Program (EDSP) to screen chemicals for their ability to interact with the endocrine system. These proposed new methods would serve as an alternative for three of the eleven current assays in the EDSP Tier 1 screening battery, specifically the estrogen receptor binding (ER), estrogen receptor transactivation (ERTA), and uterotrophic assays.
These computational high-throughput (HTP) tools will have the potential to impact significantly the prioritization for testing and will have a significant impact on List 2 test orders. EPA states that use of these alternative methods will accelerate the pace of screening, decrease costs, and reduce animal testing. In addition, this approach advances the goal of providing sensitive, specific, quantitative, and efficient screening using alternative test methods to some assays in the Tier 1 battery to protect human health and the environment. EPA has stated its commitment to the development of HTP and computational tools to improve regulatory science, as recommended in the 2007 National Research Council report, “Toxicity Testing in the 21st Century: A Vision and a Strategy,” and to meet its statutory obligations in the face of challenging budget constraints.
Comments are due by August 18, 2015. EPA specifically seeks comment on the following issues, which are related to its stated intention to use the scientific tools discussed as alternatives to some of the current EDSP Tier 1 screening assays:
- The use of the ToxCastTM “ER Model” for bioactivity as an alternative method for the current ER binding and ERTA Tier 1 screening assays.
- The use of the ToxCastTM “ER Model” for bioactivity as an alternative method for the current uterotrophic Tier 1 screening assay.
- The use of results from the ToxCastTM “ER Model” for bioactivity on over 1800 chemicals as partial screening for the estrogen receptor pathway.
EPA concludes that the ToxCastTM “ER Model” meets the criteria for use as “other scientifically relevant information” to satisfy Tier 1 for the ER, ERTA, and uterotrophic assays. EPA’s conclusion is based upon the findings of the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) Scientific Advisory Panel (SAP) peer review held in December, 2014 that endorsed the ToxCastTM “ER Model” as a replacement for the ER and ERTA assays, and additional data developed by EPA to address the SAP’s concerns regarding the uterotrophic assay. Recipients of EDSP Tier 1 test orders would have three options for addressing the Tier 1 requirements with respect to the three EDSP Tier 1 endpoints that EPA considers validated:
- Cite existing ToxCastTM “ER Model” data, if it is applicable.
- Generate new data using the 18 ER HTP assays and the ToxCastTM “ER Model.”
- Generate Tier 1 data using the validated methods for the ER, ERTA, and uterotrophic endpoints in the traditional EDSP Tier 1.
EPA is careful to note that activity in the ToxCastTM “ER Model” is not a determination that a chemical causes endocrine disruption, only that is has the potential to do so, and that further testing (Tier 2) would be needed to make a determination regarding the ability to cause “adverse effects in an intact organism or its progeny, or subpopulations,” as stated in the World Health Organization International Programme on Chemical Safety definition.
More detailed information on the Endocrine Disruptor Screening Program and its use of computational tools is available at: http://www.epa.gov/endo/ or http://www.epa.gov/endo/pubs/pivot.htm.
By Lisa M. Campbell and James V. Aidala
The U.S. Environmental Protection Agency’s (EPA) Proposal to Mitigate Exposure to Bees from Acutely Toxic Pesticide Products published in the Federal Register on May 29, 2015, seeks comment on a proposal to adopt mandatory pesticide label restrictions to protect managed bees under contract pollination services from foliar application of pesticides that are acutely toxic to bees on a contact exposure basis, unless the application is made in accordance with a government-declared public health response. These label restrictions would prohibit applications of pesticide products that EPA has identified as acutely toxic to bees, during bloom when bees are known to be present under contract.
As part of this mitigation proposal, the 48-hour notification exception for crops under contracted pollination services during bloom for all neonicotinoid product labels would be removed. These restrictions are intended to reduce the likelihood of acute exposure and mortality to managed bees under contract. EPA is not proposing at this time to require new language for pesticide labels for managed bees not under contract pollination services. This does not, however, alter EPA’s previous actions intended to impose more specific restrictions on neonicotinoid pesticides through label language addressing potential risks to bees not under contract for pollination services.
EPA is also seeking comment on a proposal to rely on efforts made by states and tribes to reduce pesticide exposures for application sites not under contracted services, through development of locally-based measures, specifically through managed pollinator protection plans. These plans would include local and customizable mitigation measures to address certain scenarios that can result in exposure to pollinators. EPA intends to monitor the success of these plans in deciding whether further label restrictions are warranted.
EPA states that if it receives evidence during the public comment period, and/or through outreach at stakeholder meetings, that the contract provisions that are the subject of the proposed rule commonly considered effective and mutually agreed upon stakeholder practices (i.e., beekeeper-to-grower) indicating that the application of acutely toxic pesticides is not of risk concern for bees under contract, then EPA will consider this information in determining whether this scenario needs the mitigation indicated in the proposed language.
EPA states that the proposed actions are consistent with the Presidential Memorandum issued in June 2014 to reduce the effect of factors that have been associated with pollinator declines in general, as well as the mandate to engage state and tribal partners in the development of pollinator protection plans. Comments on the proposal are due by June 29, 2015.
The main elements of EPA’s pesticide regulatory strategies and policies were only a small part of the response to the President last week on a National Strategy for pollinators, but now that EPA has issued this proposal, attention will turn to what EPA is more precisely planning to do with regard to proposing and implementing new restrictions on pesticides generally and/or neonicotinoid products in particular.
As expected, the focus of the proposal is on new restrictions for acutely toxic pesticide applications (defined in the notice as “pesticides with an acutely lethal dose to 50% of the bees tested of less than 11 micrograms per bee”), where the pesticide application site is also where there are contracted pollination services. Essentially, foliar application of pesticides acutely toxic to bees are prohibited where there are bee colonies present pursuant to a contract to provide pollination services. EPA’s proposal (at Appendix A) includes a long list of pesticides (over 75) that meet the acute toxicity criteria that will be subject to the new restrictions. This list includes many more pesticides than just the neonicotinoid products.
In addition, for managed bees not under contracted services, or for other “unmanaged” bees, EPA’s reliance on state “Managed Pollinator Protection Plans” (MP3s) is consistent with public statements that EPA officials and line staff have made in recent months, so there appears to be few surprises in the proposal at first glance. Some states already have plans; many are under development. EPA has worked closely with state pesticide regulatory officials on development of state plans, and signaled that it expects state plans to incorporate three core ideas: public participation in developing the plan; some kind of notification scheme to alert beekeepers of insecticide applications; and a way to evaluate whether the state plan is effective in reducing insecticide exposure to bees.
Even so, what may generate the most public comment about EPA’s proposal is what it does NOT do; for example:
- The proposal does not impose a ban on neonicotinoid pesticides as some advocacy groups have sought;
- The proposal does not require EPA approval of state management plans (MP3s);
- The proposal does suggest options for registrants to seek product-specific exemptions to what is mandated; in other words, it again seeks to impose EPA regulatory actions “by letter” using a “one size fits all” approach; and
- The proposal does not offer significantly new restrictions regarding pollinators generally, but maintains a focus on contracted honeybees and commercial pollination services.
As the proposal has just been issued, stakeholders will now review the content to look for “the devil in the details” -- and develop comments to submit during the 30-day comment period EPA offers. (It would not be surprising if the comment period on such a high profile proposal is extended.)
More information concerning the Presidential Memorandum and the national strategy are available in Bergeson & Campbell, P.C.’s (B&C®) blog post on Pollinator Health Task Force Issues National Strategy to Promote the Health of Honey Bees and Other Pollinators.