{"id":41170,"date":"2026-03-13T00:01:50","date_gmt":"2026-03-13T04:01:50","guid":{"rendered":"https:\/\/beyondpesticides.org\/dailynewsblog\/?p=41170"},"modified":"2026-03-13T10:02:02","modified_gmt":"2026-03-13T14:02:02","slug":"study-shows-widely-used-weed-killer-to-contain-pfas-further-threatening-health-and-the-environment","status":"publish","type":"post","link":"https:\/\/beyondpesticides.org\/dailynewsblog\/2026\/03\/study-shows-widely-used-weed-killer-to-contain-pfas-further-threatening-health-and-the-environment\/","title":{"rendered":"Study Shows Widely Used Weed Killer To Contain PFAS, Further Threatening Health and the Environment"},"content":{"rendered":"

(Beyond Pesticides<\/em>, March 13, 2026) In a press release<\/a> on March 10, 2026, Public Employees for Environmental Responsibility (PEER) cites independent test data on the herbicide indaziflam<\/a> with detections of per- and poly-fluoroalkyl substances (PFAS<\/a>), the \u201cforever chemicals\u201d known for significant toxicity at low level exposure and high persistence. The product, Rejuvra\u2122, is produced by Envu (a former division of Bayer) and \u201cis being sprayed and considered for use across millions of acres of Bureau of Land Management (BLM) and US Forest Service land.\u201d Scientific literature connects indaziflam and PFAS with adverse effects to human, soil, and biodiversity health, raising serious concerns about their wide use in agriculture and general land management of lawns, parks, playing fields, ornamentals, fence lines, rights-of-way, rangeland, open space, and Christmas trees.<\/p>\n

Background
\n<\/strong>As a pre-emergent weed killer used to kill annual grasses and unwanted broadleaf plants, the fluoroalkyltriazine herbicide is broadly labeled for use in residential areas, commercial ornamental and sod production, forestry, and mostly orchard crops. While indaziflam is considered a \u201cselective\u201d herbicide, it actually kills and prevents germination of a wide range of broad-leaved plants and grasses and comes close to being a soil sterilant. \u00a0Since the chemical is subject to drift and movement off the target site, it can kill annual native plants that provide important ecosystem services for pollinators<\/a> and wildlife<\/a>. Documented health and environmental effects of indaziflam include genotoxicity<\/a>\/DNA damage<\/a>, endocrine disruption<\/a>, neurotoxicity<\/a>, kidney<\/a> and liver damage<\/a>, birth\/developmental effects<\/a>, leaching<\/a>, and acute and chronic toxicity to aquatic organisms<\/a>, among others. (See here<\/a>, here<\/a>, and here<\/a>.)<\/p>\n

The classification of PFAS encompasses a large group of chemicals, with a definition that the U.S. Environmental Protection Agency (EPA) eschews. A large number of scientists and the Organisation for Economic Co-operation and Development (OECD) classify compounds with one fully fluorinated carbon atom as PFAS, which are not accurately captured in EPA\u2019s risk assessments. A wide body of science<\/a> on the adverse health and environmental effects of PFAS exists, as these synthetic chemicals have become ubiquitous in nature, wildlife, and humans, as demonstrated by biomonitoring studies. Research, documented in a literature review in Environmental Science & Technology<\/em><\/a> and additional articles, highlights the importance of a universal, cohesive definition of PFAS that incorporates all fluorinated compounds, including the long carbon chain PFOA (perfluorooactanoic acid) and PFOS (perfluorooctanesulfonic acid), as well as the ultrashort-chain perfluoroalkyl acids (PFAAs).<\/p>\n

Both long and short chain PFAS\u2019 adverse effects include, but are not limited to, cancer<\/a>, endocrine-disrupting effects<\/a>, and immune system damage<\/a>. The multitude of sources of PFAS and various exposure routes lead to widespread contamination of the environment and organisms. PFAS use in agriculture represents a large source of poisoning and contamination because of their wide application as pesticide active ingredients, use in the plastic containers that pesticides are stored in<\/a>, and as surfactants in pesticide products. Additionally, PFAS are used in many other plastic storage containers and food packaging, personal care products, nonstick cookware, cleaning supplies, treated clothing, firefighting foam, and machinery and equipment used in manufacturing\u2014all of which contaminate food<\/a>, water, soil, and the air. \u00a0(See Daily News<\/em> here<\/a>.)<\/p>\n

Product Testing Results
\n<\/strong>In testing Rejuvra\u2122, PEER finds the presence of multiple PFAS in all twelve samples, including PFHxS (perfluorohexanesulfonic acid) and PFHxA (perfluorohexanoic acid). PFBS (perfluorobutanesulfonic acid) and PFOS were also detected in many of the samples. (See the full lab reports here<\/a>, here<\/a>, and here<\/a>.)<\/p>\n

The press release notes: \u201c\u2018The discovery of toxic chemicals in a product intended for landscape-level use should set off alarm bells,\u2019 said Chandra Rosenthal, PEER Public Lands Advocate. \u2018Our public lands should not be exposed to chemicals whose impacts remain unknown and that will persist in the environment indefinitely.\u2019\u201d<\/p>\n

On the product label<\/a> itself, it is listed that indaziflam is the only active ingredient, making up 19.05% of the mixture, with the other 80.95% as \u201cOther Ingredients\u201d or \u201cinert ingredients<\/a>\u201d that are not disclosed on product labels but can have adverse biological and chemical effects. EPA interprets the federal pesticide law, the Federal Insecticide, Fungicide, and Rodenticide Act<\/em> (FIFRA), to allow secrecy of all inert or other ingredients\u2014regardless of toxicity, except for highest toxicity category above a designated percentage of the product\u2014in pesticide products that the manufacturer claims are not included in the formulation as the \u201cactive\u201d chemical ingredient to attack the target pest. Active ingredients are mostly a small fraction of the total formulation.<\/p>\n

PEER writes: \u201cManufacturers are not required to disclose the inert ingredients in pesticides, which can make up to 95% of the product and may include PFAS. The detection of PFAS in Rejuvra reinforces the need for full chemical disclosure of all ingredients in pesticides.\u201d<\/p>\n

While not detailing all of the human health risks that independent scientific literature documents for indaziflam, the label highlights some of the environmental hazards. \u201cThe product label warns that Indaziflam can contaminate surface waters via runoff and is toxic to fish, vertebrates, and aquatic plants,\u201d PEER notes. \u201cThis is a serious concern, given the extensive network of streams, wetlands, and riparian corridors across public lands.\u201d<\/p>\n

The presence of PFAS in this herbicide product is alarming to scientists and public health and environmental advocates, not only in terms of the lack of disclosure but because of the increased risks associated with chemical mixtures<\/a> within products and pesticide mixtures<\/a> as they are encountered in the environment, which can have additive or synergistic effects<\/a>. This heightened toxicity is not accounted for in individual active ingredient assessments, further threatening health and the environment.<\/p>\n

Previous Research
\n<\/strong>Both indaziflam and PFAS have been covered in previous Daily News<\/em>. One study published in Science of the Total Environment<\/em><\/a>, entitled \u201cThe silence of the clams: Forestry registered pesticides as multiple stressors on soft-shell clams,\u201d finds that chronic exposure to pesticides, including indaziflam, used in conventional forestry operations runoff harm soft shell clams. Rather than focusing on the impact of a single chemical, researchers analyzed the combined effects of several pesticides. \u201cThis is an important data gap to fill as research on these compounds\u2019 toxicity typically focuses on individual compound effects at high concentrations to determine lethality, which while necessary for understanding compound toxicity, can miss sublethal effects that can have long term impacts on these systems,\u201d said lead author Allie Tissot, PhD, previously of Portland State University and currently with the Oregon Department of Agriculture. (See Daily News<\/em> here<\/a>.)<\/p>\n

Another article highlights how indaziflam causes broadscale devastating ecological and health effects<\/a>. Use of the herbicide indaziflam is an example of the ineffectiveness of management based on herbicides. The action on seedlings is long-lasting, thus inhibiting the growth and establishment of a resilient plant community that is resistant to invasion. Given its persistence and widespread effects and the extent of the damage it causes to native soil seed banks and plant biodiversity, indaziflam could contribute to the decline of ecosystems where it is applied, similar to the cascading impacts of the systemic insecticides, such as fipronil and the neonicotinoids, on animals. The impacts of indaziflam could be even greater than insecticides since plants are the foundation of all living systems. Building resilience and resistance into a plant community requires working with succession, which requires the growth of some annuals, in preparation for the longer term community of mostly perennials\u2014contrary to the approach of killing all \u201cweeds.\u201d<\/p>\n

From epigenetic<\/a> to immunotoxic<\/a> effects, there is a wide range of health implications with PFAS exposure. Because of their ubiquitous use, studies<\/a> report that PFAS compounds are detectable in infants, children, and pregnant women. Furthermore, pregnant women can readily transfer compounds to the developing fetus through the placenta. PFAS residues are persistent in food and drinking water, with over six million U.S. residents regularly encountering drinking water with PFAS levels<\/a> above the EPA health advisory of 70 ng\/L. Therefore, PFAS are detectable in almost all of the U.S. population\u2014disproportionately afflicting people of color communities<\/a>\u2014and have implications for human health. (See Daily News<\/em> here<\/a>.)<\/p>\n

A previous Daily News <\/em>article, titled “Science on \u201cForever Chemicals\u201d (PFAS) as Pesticide Ingredients and Contaminants Documented<\/a>,” shows how and to what extent PFAS can be introduced into pesticide products, and how this impacts health and the environment. The findings are gleaned from public records requests to state and federal agencies in the U. S. and Canada, as well as from publicly accessible databases discussed in the commentary Forever Pesticides: A Growing Source of PFAS Contamination in the Environment<\/a>. According to the authors: \u201cThe biggest contributor to PFAS in pesticide products was active ingredients and their degradates [chemical breakdown products]. Nearly a quarter of all U.S. conventional pesticide active ingredients were organofluorines and 14% were PFAS, and for active ingredients approved in the last 10 y[ears], this had increased to 61% organofluorines and 30% PFAS.\u201d \u00a0<\/p>\n

In related research, a review using California Department of Pesticide Regulation fruit and vegetable test data conducted by the Environmental Working Group<\/a> (EWG), PFAS pesticides were found in peaches, strawberries, and other popular fruits. According to the report, \u201cOut of 930 samples of 78 types of non-organic, California-grown fruits and vegetables tested, 348 samples, or 37%, had traces of PFAS pesticides, based on state testing data EWG reviewed.\u201d<\/p>\n

EPA Continues to Register PFAS Pesticides, with Declaration of an \u201cEmergency
\n<\/strong>Policy and toxicology are slated to collide as EPA considers allowing the use of the PFAS pesticide<\/a>, tetflupyrolimet, by invoking an emergency waiver process in federal pesticide law. If authorized, EPA\u2019s decision will permit the use of an unregistered pesticide under an emergency waiver provision\u2014in this case, an emergency caused by weed resistance to weed killers (herbicides) on the market. EPA is accepting public comments until March 16, 11:59 pm EDT. Beyond Pesticides is urging the public to object to EPA approval by writing to EPA and\u00a0Congress stating that herbicide resistance is not an emergency and PFAS chemicals must not be broadcast in the environment<\/a>.\u00a0<\/strong><\/p>\n

Meanwhile, EPA continues to register PFAS pesticides through its normal registration review process. (See Daily News<\/em> At Odds with Intl Regulatory Bodies, EPA Defines Away PFAS Problem, Allows Widespread Contamination<\/a>.) The latest pesticide proposed for EPA registration,\u00a0epyrifenacil\u00a0<\/a>(agricultural weed killer), joins\u00a0cyclobutrifluram<\/a>\u00a0(soil fungicide\/nematicide),\u00a0isocycloseram<\/a>\u00a0(household and agricultural insecticide),\u00a0diflufenican<\/a>\u00a0(lawn and agricultural weed killer), and\u00a0trifludimoxazin<\/a>\u00a0(agricultural weed killer), making a total of five PFAS pesticide proposals in 2025 that have been associated with national and worldwide contamination of food, land, and water. Two of these, cyclobutrifluram and isocycloseram, have been approved as of last fall.<\/p>\n

The Organic Solution
\n<\/strong>As PEER points out in their press release: \u201c\u2018Land managers have safer, proven alternatives to spraying Rejuvra,\u2019 said David Jenkins, former Senior Executive at BLM. \u2018Mechanical removal, restoration with native plants, and improved grazing management can reduce invasive grasses without introducing new toxic risks.\u2019\u201d<\/p>\n

With EPA\u2019s failure to perform its statutory duty to adequately protect the health of the environment and all organisms within it, as extensively covered<\/a> by Beyond Pesticides, the call to truly safeguard ecosystems and public health with the elimination of pesticides, including all herbicides like indaziflam and all PFAS, takes on a greater urgency. Instead of creating a complicated workaround that will not address the urgent health, biodiversity, and climate crises, EPA must cancel registrations of pesticides that harm health and the environment and facilitate a widescale conversion to organic practices<\/a>.<\/p>\n

The holistic, systems-based organic solution for land management and agriculture offers numerous health<\/a> and environmental<\/a> benefits. Learn more about how to take action and have your voice heard on governmental efforts that are harmful to the environment and public and worker health, increase overall pesticide use, and undermine the advancement of organic, sustainable, and regenerative practices and policies here<\/a>.<\/p>\n

All unattributed positions and opinions in this piece are those of Beyond Pesticides. <\/em><\/p>\n

Source<\/strong>:<\/p>\n

Rosenthal, C. and Jenkins, D. (2026) New Testing Detects Toxic PFAS in Herbicide Applied Across Public Lands, Public Employees for Environmental Responsibility (PEER). Available at: https:\/\/peer.org\/new-testing-detects-toxic-pfas-in-herbicide-applied-across-public-lands\/<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

(Beyond Pesticides, March 13, 2026) In a press release on March 10, 2026, Public Employees for Environmental Responsibility (PEER) cites independent test data on the herbicide indaziflam with detections of per- and poly-fluoroalkyl substances (PFAS), the \u201cforever chemicals\u201d known for significant toxicity at low level exposure and high persistence. The product, Rejuvra\u2122, is produced by Envu (a former division of Bayer) and \u201cis being sprayed and considered for use across millions of acres of Bureau of Land Management (BLM) and US Forest Service land.\u201d Scientific literature connects indaziflam and PFAS with adverse effects to human, soil, and biodiversity health, raising serious concerns about their wide use in agriculture and general land management of lawns, parks, playing fields, ornamentals, fence lines, rights-of-way, rangeland, open space, and Christmas trees. Background As a pre-emergent weed killer used to kill annual grasses and unwanted broadleaf plants, the fluoroalkyltriazine herbicide is broadly labeled for use in residential areas, commercial ornamental and sod production, forestry, and mostly orchard crops. While indaziflam is considered a \u201cselective\u201d herbicide, it actually kills and prevents germination of a wide range of broad-leaved plants and grasses and comes close to being a soil sterilant. \u00a0Since the chemical is subject to drift […]<\/p>\n","protected":false},"author":2,"featured_media":41172,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[158,352,1213,350,565,354,411,494,553,488,515,13],"tags":[2511,292,2513,2515,997,2509,2512,2514,715,644,2516,1407,1664,2510],"class_list":["post-41170","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bayer","category-biodiversity","category-chemical-mixtures","category-contamination-2","category-ecosystem-services","category-environmental-protection-agency-epa","category-forestry","category-herbicides","category-indaziflam","category-pesticide-mixtures","category-pfas","category-wildlifeenvironment","tag-active-ingredient","tag-biodiversity","tag-chemical-mixture","tag-forestry","tag-herbicide","tag-indaziflam","tag-inert-ingredient","tag-pesticide-mixture","tag-pfas","tag-public-health","tag-public-land","tag-soil-health","tag-synergistic-effects","tag-weed-killer"],"yoast_head":"\nStudy 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Pesticides\"},\"description\":\"Beyond Pesticides is a 501(c)3 nonprofit organization headquartered in Washington, D.C., which works with allies in protecting public health and the environment to lead the transition to a world free of toxic pesticides. The founders, who established Beyond Pesticides (originally as National Coalition Against the Misuse of Pesticides) as a nonprofit membership organization in 1981, felt that without the existence of such an organized, national network, local, state and national pesticide policy would become, under chemical industry pressure, increasingly unresponsive to public health and environmental concerns. Beyond Pesticides believes that people must have a voice in decisions that affect them directly. We believe decisions should not be made for us by chemical companies or by decision-makers who either do not have all of the facts or refuse to consider them. Learn more about our work, read A Year in Review\u20142021, our accomplishments are your victories! Beyond Pesticides seeks to protect healthy air, water, land, and food for ourselves and future generations. By forging ties with governments, nonprofits, and people who rely on these natural resources, we reduce the need for unnecessary pesticide use and protect public health and the environment. Beyond Pesticides provides hands-on services to the public and supports local action by: identifying and interpreting hazards; and, designing safe pest management programs. With the information provided by Beyond Pesticides, people may not only be able to make informed choices and adopt practices that protect themselves and their families from unnecessary exposure to pesticides, but they will be able to effect changes on community-wide pest management decisions and policies that govern pesticide use, such as pesticide uses in parks, schools, for community insect control and along roadsides. 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