Cited by 141Per- and polyfluoroalkyl substances researchPesticide and Herbicide Environmental StudiesPesticide Exposure and Toxicity

Forever Pesticides: A Growing Source of PFAS Contamination in the Environment

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Donley, Nathan, Cox, Caroline, Bennett, Kyla, Temkin, Alexis M., Andrews, David Q., Naidenko, Olga V.·2024·Environmental Health Perspectives

Abstract

BACKGROUND: Environmental contamination by fluorinated chemicals, in particular chemicals from the per- and polyfluoroalkyl substances (PFAS) class, has raised concerns around the globe because of documented adverse impacts on human health, wildlife, and ecosystem quality. Recent studies have indicated that pesticide products may contain a variety of chemicals that meet the PFAS definition, including the active pesticide ingredients themselves. Given that pesticides are some of the most widely distributed pollutants across the world, the legacy impacts of PFAS addition into pesticide products could be widespread and have wide-ranging implications on agriculture and food and water contamination, as well as the presence of PFAS in rural environments. OBJECTIVES: The purpose of this commentary is to explore different ways that PFAS can be introduced into pesticide products, the extent of PFAS contamination of pesticide products, and the implications this could have for human and environmental health. METHODS: We submitted multiple public records requests to state and federal agencies in the United States and Canada and extracted relevant data from those records. We also compiled data from publicly accessible databases for our analyses. DISCUSSION: We found that the biggest contributor to PFAS in pesticide products was active ingredients and their degradates. Nearly a quarter of all US conventional pesticide active ingredients were organofluorines and 14% were PFAS, and for active ingredients approved in the last 10 y, this had increased to 61% organofluorines and 30% PFAS. Another major contributing source was through PFAS leaching from fluorinated containers into pesticide products. Fluorination of adjuvant products and "inert" ingredients appeared to be limited, although this represents a major knowledge gap. We explored aspects of immunotoxicity, persistence, water contamination, and total fluorine load in the environment and conclude that the recent trend of using fluorinated active ingredients in pesticides may be having effects on chemical toxicity and persistence that are not given adequate oversight in the United States. We recommend a more stringent risk assessment approach for fluorinated pesticides, transparent disclosure of "inert" ingredients on pesticide labels, a complete phase-out of post-mold fluorination of plastic containers, and greater monitoring in the United States. https://doi.org/10.1289/EHP13954.

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  • Tetraconazole contains fluorinated functional groups capable of degrading into short-chain PFAS.

    “Similarly, tetraconazole contains fluorinated functional groups capable of degrading into short-chain PFAS.51,52”

    From Per- and Polyfluoroalkyl Substances in Surface Water and Fluvial Sediments of a Rural Gulf Coast Watershed: A Year-long Spatiotemporal Assessment (2026) · cites this paper as [52]

    Table 2 in the Discussion lists tetraconazole as a PFAS pesticide active ingredient. The ‘Consequences of PFAS in Pesticides’ discussion says many PFAS active ingredients may eventually yield ultrashort-chain PFAS, but it does not establish that tetraconazole specifically can do so. The paper also distinguishes ultrashort-chain from short-chain PFAS, so the claimed product category does not match its wording. Page numbers were not available in our copy. (LLM, conf=0.84)

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  • Fluometuron contains a -CF3 moiety and has been identified as a potential precursor of trifluoroacetic acid (TFA).

    “Fluometuron contains a -CF 3 moiety and it has been identified as a potential precursor of trifluoroacetic acid (TFA).”

    From Per- and Polyfluoroalkyl Substances in Surface Water and Fluvial Sediments of a Rural Gulf Coast Watershed: A Year-long Spatiotemporal Assessment (2026) · cites this paper as [52]

    Table 2 in the Discussion lists fluometuron as a PFAS active ingredient. The Discussion’s “Consequences of PFAS in Pesticides” section says many −CF3-containing pesticide ingredients may break down into TFA, but it does not specifically identify fluometuron as having a −CF3 group or as a potential TFA precursor. Page numbers are unavailable in our copy. (LLM, conf=0.82)

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Cites

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Research works printed but not linked: 4

  1. [17]US EPA. 2022. Lifetime drinking water health advisories for four perfluoroalkyl substances. Docket No. FRL 9855-01-OW. Fed Reg 87(118): 36848– 36849. https://www.govinfo.gov/content/pkg/FR-2022-06-21/pdf/2022-13158.pdf [accessed 23 January 2024].
  2. [71]US EPA. 2024. Pesticides; proposed removal of polytetrafluoroethylene from list of approved inert ingredients for pesticide products. Docket Nos. EPA-HQ-OPP-2024-0041, FRL-11698-01-OCSPP. Fed Reg 89(40): 14646– 14648. https://www.govinfo.gov/content/pkg/FR-2024-02-28/pdf/2024-04059.pdf [accessed 30 April 2024].
  3. [91]US EPA. 2023. IRIS Toxicological Review of Perfluorohexanesulfonic Acid (PFHxS, CASARN 335-46-4) and Related Salts. Public Comment and External Review Draft. EPA/635/R-23/148a. https://downloads.regulations.gov/EPA-HQ-ORD-2021-0562-0006/content.pdf [accessed 14 August 2023]. 40334024
  4. [95]US EPA. 2007. Pesticides; data requirements for conventional chemicals. Docket Nos. EPA-HQ-OPP-2004-0387, FRL-8106-5. RIN 2070-AC12. Fed Reg 72(207): 60933– 60988. https://www.govinfo.gov/content/pkg/FR-2007-10-26/pdf/E7-20826.pdf [accessed 14 August 2023].

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Authors
Donley, N., Cox, C., Bennett, K., Temkin, A. M., Andrews, D. Q., & Naidenko, O. V.
Affiliations
  • Center for Biological Diversity, Portland, Oregon, USA
  • Center for Environmental Health (US)
  • Public Employees for Environmental Responsibility, Silver Spring, Maryland, USA
  • Environmental Working Group, Washington, District of Columbia, USA
Corresponding author
Donley, Nathan
Venue
Environmental Health Perspectives
Published
2024-07
Volume
132
Issue
7
Pages
75003-75003
ISSN
  • 0091-6765 (ISSN-L)
  • 1552-9924
OpenAlex
W4400952853
Cited by
140
References
70
Citations by year
2026: 71 · 2025: 64 · 2024: 5
FWCI
18.43
Type
journal article
Language
en
Open access
Licence
public-domain
Locations
  • Environmental Health Perspectives (publishedVersion, public-domain)
  • PubMed Central (publishedVersion, public-domain)
  • PubMed (publishedVersion)
Funders
U.S. Geological Survey
Topics
  • Physical Sciences › Environmental Science › Environmental Chemistry › Per- and polyfluoroalkyl substances research
  • Physical Sciences › Environmental Science › Pollution › Pesticide and Herbicide Environmental Studies
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Pesticide Exposure and Toxicity
Keywords
PFAS, per- and polyfluoroalkyl substances, pesticide active ingredients, PFAS leaching, immunotoxicity, chemical persistence, water pollution, risk assessment, regulatory oversight, food and water contamination
MeSH terms
Canada, Environmental Exposure, Environmental Monitoring, Environmental Pollutants, Environmental Pollution, Fluorocarbons, Humans, Pesticides, United States

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