(Beyond Pesticides, November 1, 2023) A study published in Environmental Health Perspective finds the risk of acute childhood leukemia (AL), specifically acute lymphoblastic leukemia (ALL), slightly increases with exposure to pesticides (i.e., insecticides and herbicides) from uses on vines, a crop subject to intensive pesticide use. Within 1 kilometer [km] of vineyards, the risk of ALL among children increases in areas with a higher density of vines. Although medical advancements in disease survival are more common nowadays, childhood AL remains the secondary cause of child mortality following physical injury. Furthermore, childhood leukemia survivors can suffer from chronic or long-term health complications that may be life-threatening. The etiology or cause of childhood AL involves the interaction of multiple components, including lifestyle and genetics; emerging evidence indicates that environmental contaminants (e.g., pesticides, air pollution, solvents, diet, etc.) play a role in disease. Pesticide contamination is widespread in all ecosystems, and chemical compounds can accumulate in human tissues, resulting in chronic health effects. Children are particularly vulnerable to the impacts of pesticide exposure as their developing bodies cannot adequately combat exposure effects. Already, studies find low levels of pesticide exposure during pregnancy or childhood cause adverse health effects, from metabolic disorders to mental and physical disabilities. Moreover, […]

(Beyond Pesticides, October 31, 2023) With cooler weather setting in and people heading indoors and closing windows, the issue of COVID-19 transmission escalates, as do concerns about toxic chemicals filling the indoor ambient air. As a recent segment of 60 Minutes (October 29, 2023) stresses, COVID-19 spreads elevated public concern and understanding about the importance of ventilation, filtration, and air exchange to indoor air quality. Unfortunately, the concerns about indoor air are not limited to COVID-19 as volatile organic compounds (VOCs) invade most spaces where people live and work. These invisible toxic substances can be found in common household products, furniture, mattresses, and more, including pesticides in and around the house. Recognizing the risks associated with VOCs and the potentially hazardous off-gassing process is crucial for protecting public health.  VOCs are a group of chemicals that can easily vaporize into the air at room temperature. These compounds are found in many everyday items, including furniture, cleaning products, pesticides, cosmetics, and even air fresheners. Some household products, particularly pesticides, can introduce their own set of risks in addition to the risks they pose due to their VOC content. VOCs can range from harmless to harmful, and their presence can have a […]

(Beyond Pesticides, October 25, 2023) A study published in Environmental Pollution finds farming and organophosphate (OP) pesticide exposure are risk factors for depression, with pesticide poisoning being a risk factor for suicidal behavior. Additionally, psychiatric disorder prognosis affects men more than women, with depression and suicidal outcomes more common among pesticide-exposed males. Age also affected depression and suicidal consequences, with elevated rates among older farmers. Research on pesticide-induced diseases commonly investigates pesticide exposure concerning the development of various physical illnesses. However, previous studies show that occupational (work-related) risks of developing depression are high in agriculture, where pesticide use is widespread. Acute exposure to chemicals, including organophosphate, organochlorine, triazine, and carbamate pesticides, tends to put farmers at elevated risk. More study is needed on pesticide exposure and similar psychological (psychiatric) effects in the general population. According to the World Health Organization (WHO), depression affects 322 million people globally, with the number of diagnosed patients increasing by 18.4% from 2005 to 2015. Although the etiology of depression—and many other psychiatric disorders—is often genetic, studies suggest that other etiological factors, like pesticide exposure, play a role in depression incidents. Poor mental health has a tangible influence on physical health (e.g., depression and cardiovascular disease); therefore, the combination of pesticide exposure […]

(Beyond Pesticides, October 18, 2023) A meta-analysis published in Toxics finds an association between exposure to organophosphate pesticides (OPs) and respiratory diseases and diabetes mellitus (DM). Specifically, wheezing and asthma are the most common respiratory manifestations of OP exposure, while fluctuation in weight and fat/glucose levels are the most common metabolically related manifestations. Organophosphorus pesticides have a wide range of biological uses—from insecticides to flame retardants—that make these chemicals ubiquitous, significantly contributing to ecosystem contamination. Thus, OP compounds have a global distribution, with evaporation and precipitation facilitating long-range atmospheric transport, deposition, and bioaccumulation of hazardous chemicals in the environment. Many studies show OPs are highly toxic, and residues are consistently present in human and animal urine, blood, tissues, and milk. Considering 90 percent of Americans have at least one pesticide compound in their body, primarily stemming from dietary exposure, including food and drinking water, advocates maintain that current restrictions on their use must adequately detect and assess total chemical contaminants.  This study investigated the effects and possible mechanisms involved in adverse health outcomes associated with OP exposure. Reviewing studies from Web of Science, PubMed, Embase, OVID, and the Cochrane Library, researchers systematically searched for articles on OP exposure and respiratory, DM, and cardiovascular disease (CVD) outcomes until 2022. […]

(Beyond Pesticides, October 12, 2023) A new study published in Environment International finds novel environmental chemicals (i.e., piperidine insecticide, 2,4-dinitrophenol, benzo[a]carbazole, and a benzoate derivative) involved in developing breast cancer through various inflammation pathways. These new potential factors contribute to breast cancer and highlight the importance of employing epidemiological biomonitoring like exposome (total exposure from birth to death) to discover mechanisms involved in disease development that are otherwise overlooked. According to the Centers for Disease Control and Prevention (CDC), breast cancer is a disease that causes breast cells to grow out of control, with the type of breast cancer depending on the cells themselves. Several studies and reports, including U.S. Environmental Protection Agency (EPA) data, identify hundreds of chemicals as influential factors (either promoting or initiating) associated with breast cancer risk. Breast cancer is the most common cancer among women, accounting for 12 percent of all new annual cancer cases worldwide and causing the second most cancer-related deaths in the United States. Past studies suggest genetic inheritance factors influence breast cancer occurrence. However, genetic factors only play a minor role in the incidence of breast cancer, while exposure to external environmental factors (e.g., chemical exposure) appears to play a more notable role. One in […]

(Beyond Pesticides, October 11, 2023) Rachel Carson Conservation Park, a 650-acre conservation area in Montgomery County, Maryland, named in honor of the renowned scientist and author Rachel Carson, is now at the center of a controversy surrounding the use of toxic herbicides. Ms. Carson played a pivotal role in raising awareness about the harmful ecosystem and human health effects of pesticides that led to the banning of DDT. Environmentalists and concerned citizens have raised alarm over the recent spraying of “invasive weeds” with Garlon 3A, a powerful herbicide, within the park’s boundaries. Concern about pesticide use in Montgomery County is complicated by competing jurisdictions and restrictions within the county, and highlights the stark difference between nontoxic organic practices and pesticide-dependent Integrated Pest Management. (See more below on Montgomery County land management policy for local parks.) According to the Montgomery County website: “Montgomery County Parks [Maryland-National Capital Park and Planning Commission or M-NCPPC] are a State agency. M-NCPPC operates under an integrated pest management plan (IPM). Montgomery Parks manages all playgrounds, community gardens and common lawn areas within local parks without the use of pesticides. In 2016, Montgomery Parks designated ten pesticide-free parks. In September 2019, the program expanded to 45 […]

(Beyond Pesticides, October 10, 2023) In recent years, the effects of climate change have become more frequent and more severe, from extreme weather events to rising sea levels. But perhaps one of the most insidious consequences of a warming planet is the way it influences the spread of diseases, often hitting marginalized communities the hardest. This is no more evident than in the case of malaria, where the disease transmission through the Anopheles stephensi mosquito serves as a dire warning of the challenges caused by a changing climate. As this deadly vector of disease expands its territory, it is clear that pesticide-intensive approaches are poorly equipped to cope with the threat as insect resistance to chemical controls steadily grows.  Native to South Asia, the Anopheles stephensi mosquito has been on a relentless journey, crossing continents from the Arabian Peninsula to East Africa and deeper into the African continent. The mosquito’s ability to quickly adapt to new environments, bolstered by shifting climate patterns, illustrates how global warming affects disease vectors. Matthew Thomas, PhD, emphasizes, “Anopheles stephensi has higher thermal tolerance and a capacity to transmit at higher temperatures than Anopheles gambiae [another malaria-spreading mosquito]. This is significant when considering climate change […]

(Beyond Pesticides, October 4, 2023) A study published in Food and Chemical Toxicology finds acute exposure to chlordane, an organochlorine insecticide, results in decreased lipid (fat) levels, altered anti-oxidant capacity, and increased testosterone levels (pro-androgenic) in male mice, while increasing liver enzyme activation and reducing regulation of both liver identity and function in females. These findings indicate that chlordane induces toxicant-associated steatosis (fat retention) liver disease (TASLD) with underlying, sex-specific, endocrine, and metabolic effects. It is well-known that traces of legacy (past-use) pesticides, like organochlorine pesticides (OCPs), remain in the environment for decades—possibly centuries, post-final application, as OCPs have greater chemical stability and gradual attenuation. However, these chemicals have profound adverse impacts on human health, especially on the endocrine system. Obesity, insulin resistance, type 2 diabetes, and elevated liver enzymes resulting from endocrine disruption contribute to liver diseases and can lead to liver cirrhosis. Although some, but not all, manufacturing and use of specific OCPs have declined in the U.S., OCPs remain a global issue, as much of the developing world still report usage. Considering the lack of studies on OCP-induced endocrine disruption, TASLD, and other liver diseases, research like this highlights the need to understand the underlying mechanisms contributing to […]

(Beyond Pesticides, September 29, 2023) In unsurprising news, the Environmental Protection Agency (EPA) has reversed itself and decided not to ban a dangerous pesticide: tetrachlorovenphos (TCVP) used in pet flea collars and other flea products. This is despite its own earlier decision to ban TCVP in pet collars and scathing criticism of its methods and conclusions by the courts. First registered in 1966, TCVP belongs to the notoriously toxic organophosphate chemical family and is classified by the World Health Organization as “possibly carcinogenic to humans.” It was originally registered to Shell Chemical, then to E.I. duPont de Nemours, then to Hartz Mountain Corporation and Fermenta Animal Health Company.  Early on, it was registered for use on food crops and livestock, but the crop uses were voluntarily de-registered in 1987. It is still widely used on pets and farm animals. In 1995, EPA issued the opinion that “all uses of tetrachlorvinphos, with the exception of oral feed-through larvicide treatment to livestock intended for food use, will not cause unreasonable risk to humans or the environment.” Since then, the agency has contorted itself repeatedly to allow TCVP to remain on the market. There is little research available on TCVP’s human health effects; the […]

(Beyond Pesticides, September 27, 2023) A study published in Pesticide Biochemistry and Physiology finds organophosphate (OP), organochlorine (OC), and pyrethroid (PYR) pesticides have links to insulin resistance (IR) associated with metabolic disorders like diabetes, obesity, chronic kidney disease (CKD), and hypertension. Metabolic disorders are among the leading causes of morbidity and mortality, with over 11 percent (>37 million) of individuals in the U.S. having diabetes, and cases are growing by millions annually. Additionally, there is a rise in metabolic disorders among young people. Studies even find low levels of pesticide exposure during pregnancy or childhood cause adverse health effects, including metabolic disorders tied to gut microbiome disruption (dysbiosis). With increasing rates of diabetes and obesity, the two most prominent metabolic diseases in the study, cases among the global population, studies like these highlight the importance of evaluating how chemical contaminants deregulate normal bodily function through metabolic changes.  To investigate the association between pesticide exposure and insulin-related metabolic disorders in humans, researchers searched the PubMed database for articles, performing a systematic review. The study notes, “IR is defined as a pathological state in which a higher-than-normal level of insulin is required to produce the optimal response in cells.” The search generated 4,051 articles related to the topic. However, after excluding duplicates and […]

(Beyond Pesticides, September 21, 2023) A literature review published in Ciência & Saúde Coletiva finds environmental exposure to all classes of pesticides (fungicides, herbicides, insecticides) has an association with childhood astrocytoma (brain/central nervous system [CNS] tumor). CNS tumors represent half of all malignant neoplasms (tumors) in children. Although medical advancements in disease survival are progressing, childhood cancer remains the leading cause of death from disease among children. Furthermore, childhood cancer survivors can suffer from chronic or long-term health complications that may be life-threatening. The etiology or cause of childhood cancer involves the interaction of multiple components that include environment, lifestyle and genetics. However, emerging evidence indicates that environmental contaminants like pesticides (e.g., occupational exposures, air pollution, pesticides, solvents, diet, etc.) affect disease etiology. Pesticide contamination is widespread in all ecosystems, and chemical compounds can accumulate in human tissues, resulting in chronic health effects. Children are particularly vulnerable to the impacts of pesticide exposure, as their developing bodies cannot adequately combat exposure effects. Moreover, several studies demonstrate an association between environmental or occupational pesticide exposure and the risk of childhood cancer. Considering that maternal pesticide exposure can have a stronger association with cancer among children than childhood exposure, and newborns can still encounter pesticides, it is […]

(Beyond Pesticides, September 20, 2023) Higher concentrations of a pyrethroid metabolite (3-PBA) in the body have an association with increased osteoarthritis (OA) risk among US adults, according to a study published in BMC Public Health. Regardless of analysis sensitivity and population subgroup (e.g., sex, socioeconomic status, etc.), the association between pyrethroid exposure and OA remains. Osteoarthritis is a degenerative joint disease resulting from the degradation (breakdown) of joint cartilage and underlying bone. This disease affects 1 in 7 U.S. adults and is the fourth leading cause of disability in the U.S. Unfortunately, OA is one of the most recently attributed pesticide-induced diseases associated with this dangerous class of chemical insecticides—harm to individual Americans that the U.S. Environmental Protection Agency (EPA) is not considering when it registers pesticides. To remedy the significant deficiencies in EPA’s reviews and protect residents from chronic disease, more and more communities are transitioning to safer, organic pest management practices that do not require pyrethroids and other toxic synthetic pesticides. Thus, this study and others like it highlight the need for increased monitorization of pyrethroid exposure among the general population. Using data from the 1999–2002 and 2007–2014 National Health and Nutrition Examination Survey (NHANES), this study explores the relationship between pyrethroid exposure and osteoarthritis. NHANES is […]

(Beyond Pesticides, August 31, 2023) A study published in Environmental Research finds glyphosate levels in the body adversely affect neurological health. Specifically, oral intake (e.g., eating contaminated foods), inhalation, and dermal exposure to glyphosate lowered cognitive function scores, heightened likelihood of severe depressive symptoms, and impaired auditory (hearing) function. Thus, this study provides some of the first evidence linking glyphosate exposure to specific neurological health outcomes among the general U.S. population, indicating the need for further studies on mechanisms driving neurotoxicity and the medical significance over time. Although this study is among the first to highlight specific neurological effects from glyphosate exposure among the general population, this study is not the first to identify potential neurotoxicity from glyphosate exposure. (Previous research cited below.) The ubiquity of glyphosate uses in agriculture—which leaves residues of the toxic chemical in food—and in public areas (e.g., parks, and walkways) may mean that exposures to it represent a significant risk factor for the disease. Glyphosate is already implicated or proven in developing numerous health anomalies, including cancer. The neurological system, including the brain, spinal cord, and a vast network of nerves and neurons, is responsible for many bodily functions—from sensation to movement. However, pesticides play various roles in […]

(Beyond Pesticides, August 23, 2023) Researchers are investigating a cutting-edge method to identify the impact of pesticides on reproductive health—shrinking the wait time from months to weeks. Scientists at the University of California, Davis, are developing a method for identifying harmful chemicals in pesticides with the help of glowing fish. This scientific breakthrough could revolutionize pesticide research and help prevent long-term health problems caused by exposure to these chemicals.  Pesticide exposure can cause acute and long-term health problems for the human endocrine system, the hormone system that regulates many biological processes from reproduction to blood sugar, growth, and more. Beyond Pesticides has written about the connections between EPA-registered pesticides and involuntary abortions, reproductive cancers, pregnancy loss, early-onset puberty, and more.   The American Academy of Pediatrics (AAP) has expressed concern over the limited or missing data regarding the health effects of pesticides and food additives on infants and children, who are more vulnerable to chemical exposures. AAP has identified several compounds as being of particular concern, including bisphenols, which are commonly used in the lining of metal cans; phthalates, which are used in adhesives and plasticizers; nonpersistent pesticides, which have been addressed in a previous AAP policy statement; perfluoroalkyl chemicals (PFCs), […]

A recently completed study (available in preprint before peer review) identifies the development of what the authors term Toxicant-Induced Loss of Tolerance (TILT), the constellation of symptoms associated with chemical exposures.

(Beyond Pesticides, August 16, 2023) A study published in Environmental Science and Pollution Research further supports the indication that exposure to organophosphate insecticides (OPs) increases the risk of asthma among the U.S. general population. According to the Asthma and Allergy Foundation of America, “The burden of asthma in the United States falls disproportionately on people with low-income, senior adults, and Black, Hispanic and American Indian/Alaska Native people,” making these groups more susceptible to developing this chronic lung disease upon OP exposure.   Organophosphorus pesticides have a wide range of biological uses—from insecticides to flame retardants—that make these chemicals ubiquitous, significantly contributing to ecosystem contamination. Furthermore, while organophosphates have less bioaccumulation potential, residues are consistently present in human and animal blood, urine, tissues, and milk. Although research demonstrates that OPs are highly toxic, there remains an inadequate understanding of how OP exposure impacts body systems like the repository system. The respiratory system is essential to human survival, regulating gas exchange (oxygen-carbon dioxide) in the body to balance acid and base tissue cells for normal function. However, damage to the respiratory system can cause several issues—from asthma and bronchitis to oxidative stress that triggers the development of extra-respiratory manifestations like rheumatoid arthritis and cardiovascular disease. Therefore, the rise in respiratory illnesses and organophosphate […]

(Beyond Pesticides, August 11, 2023) Reinforcing earlier findings, a systematic review published in Chemosphere finds the popular herbicide glyphosate and its formulations (glyphosate-based formulations-GBF) exhibit five out of the ten key characteristics (KC) of carcinogens (cancer-causing chemicals). Specifically, glyphosate exhibits strong evidence of genotoxicity, epigenetic alterations (heritable changes in gene expression), oxidative stress, chronic inflammation, endocrine disruption, and disturbs gut microbiota implicated in lymphomagenesis (growth and development of lymphoma). Although organizations like the International Agency for Research on Cancer (IARC) designate glyphosate as a probable human carcinogen, and scientific literature supports the findings on these adverse effects purported by glyphosate, the chemical remains on the U.S. market in various formulations. Glyphosate is the most commonly used active ingredient worldwide, appearing in many herbicide formulas, not just Bayer’s (formerly Monsanto) Roundup®. The use of this chemical has been increasing since the inception of crops genetically modified to tolerate glyphosate over two decades ago. The toxic herbicide readily contaminates the ecosystem with residues pervasive in food and water commodities. In addition to this study, literature proves time and time again that glyphosate has an association with cancer development, as well as human, biotic, and ecosystem harm. Therefore, advocates point to the need for national policies to reassess hazards associated with […]

(Beyond Pesticides, August 8, 2023) A study published in PLOS ONE finds a pointed, positive association between chronic kidney disease (CKD) of unknown origins (CKDu) and the use of indoor pesticides. Longer exposure times have an especially detrimental impact on kidney function, even among individuals without underlying diseases like diabetes mellitus and hypertension. The innovation of this study’s purpose highlights the lack of exposure-related studies on kidney health outcomes associated with indoor pesticide use. Although CKD risk increases with age and is associated with other health factors like smoking, heart disease, and diabetes, cases without clear causes are increasingly common, indicating that environmental factors are likely playing a role. Over six million people in the U.S. have kidney disease (i.e., nephritis [kidney inflammation], nephrotic syndrome [improper protein filtration], and nephrosis). Although many studies find an association between exposure to outdoor environmental contaminants like pesticides and CKD, the association between CKDu and indoor pesticides—whose uses are more commonly concentrated in homes— remains unclear. Therefore, studies like this highlight the need for comprehensive information regarding co-occurring exposure patterns and disease prevalence that can have global implications.  The study notes, “Previous research has highlighted the potential harm of pesticides on kidney function, particularly in outdoor uses. Our findings raise […]

(Beyond Pesticides, August 2, 2023) A study published in Pest Management Science finds resistance to insecticides like pyrethroids are challenging attempts to control the mosquito Aedes aegypti (Ae. aegypti), the primary transmitter (vector) of dengue fever. While this study takes place in Bangladesh, resistance to biocides—whether to antibiotics, antimicrobials, or pesticides—is growing globally. Prevention of disease outbreaks is threatened by reliance on chemical biocides to which pathogens and their vectors develop resistance. In fact, resistance is predicted by elementary population genetics, and the speed of its evolution is directly related to the toxicity—that is, the strength of selection pressure—and inversely related to the generation length of the organism. (See PAY articles here and here, a PBS article here.) Insecticide resistance has been an issue since the introduction of DDT (dichlorodiphenyltrichloroethane) in the 1940s. Although most countries currently ban DDT use, the compound is not the only chemical pesticide promoting pest resistance. Several current-use insecticides pose the same threat. Areawide, indiscriminate spraying of insecticides is causing resistance to develop among many pests. Mosquitoes have become increasingly resistant to synthetic pyrethroids, in addition to other classes of insecticides, such as carbamates and organophosphates. Thus, this study demonstrates the need for sustainable and practical strategies […]

(Beyond Pesticides, August 1, 2023) The U.S. Environmental Protection Agency has announced that it is publishing a decade’s worth of pesticide incident data in a searchable database that will be updated on a monthly basis. The Incident Data System (IDS), with poisoning reports generated mostly from chemical manufacturers, states, a national hotline, and poison control centers, offers information on reported pesticide exposures from accidental poisoning of pets, wildlife, and humans, to pesticide drift, noncompliance, and other pesticide incidents that may be associated with product uses in compliance with label instructions. Tracking this incident data is essential to understanding the risks and damages associated with pesticide use.   The bulk of the data on incidents is from consumer reports to chemical manufacturers. Chemical companies are required under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA), Section 6(a)(2) to report incidents: “If at any time after the registration of a pesticide the registrant has additional factual information regarding unreasonable adverse effects on the environment of the pesticide, the registrant shall submit such information to the Administrator.” The determine of threshold number of incidents required to be reported as a pattern of “unreasonable adverse effects” is left to the manufacturers to determine. Through […]

(Beyond Pesticides, July 31, 2023) As the national debates on the rights of women to make health decisions about their bodies in the context of abortions, the scientific literature is increasingly documenting involuntary spontaneous abortions and other reproductive effects associated with pesticide exposure—raising critical questions about the ability to control one’s health. Last week, Beyond Pesticides reported on an exploratory study, published in Environment International, that adds to the many studies demonstrating residential prenatal pesticide exposure can result in adverse birth outcomes. Residential exposure to five active pesticide ingredients (Ais) fluroxypyr-meptyl, glufosinate-ammonium, linuron, vinclozolin, and picoxystrobin has adverse effects on gestational age (GA), birth weight (BW), mortality after birth, child’s sex, premature development, low birth weight (LBW), small for gestational age (SGA), and large for gestational age (LGA).  Despite the political furor surrounding medical abortions, the U.S. Environmental Protection Agency (EPA) continues to allow pesticides that cause involuntary spontaneous abortions (miscarriages) and other reproductive effects in exposed women. Tell EPA to ban pesticides that cause involuntary spontaneous abortions (miscarriages) and other reproductive effects. Tell Congress to ensure that EPA does not permit the use of pesticides affecting reproduction.  Most spontaneous abortions occur during the first trimester. The most common cause of miscarriage during the first […]

(Beyond Pesticides, July 26, 2023) An exploratory study published in Environment International adds to the many studies demonstrating residential prenatal pesticide exposure can result in adverse birth outcomes. Residential exposure to five active pesticide ingredients (Ais) fluroxypyr-meptyl, glufosinate-ammonium, linuron, vinclozolin, and picoxystrobin has adverse effects on gestational age (GA), birth weight (BW), mortality after birth, child’s sex, premature development, low birth weight (LBW), small for gestational age (SGA), and large for gestational age (LGA). Pesticides’ presence in the body has implications for human health, especially during vulnerable life stages like childhood, puberty, pregnancy, and old age. Pesticide exposure during pregnancy is of specific concern as health effects for all life stages can be long-lasting. Birth and reproductive complications are increasingly common among individuals exposed to environmental toxicants like pesticides. The Centers for Disease Control and Prevention (CDC) reports birth defects are the leading cause of infant mortality, with one in every 33 infants born with an abnormality that results in death. Therefore, studies like this can help government and health officials safeguard human health by assessing adverse effects following prevalent chemical exposure.  Using a Dutch birth registry from 2009 to 2013, the researchers selected pregnant mothers over 16 years who were living in non-urban areas (who […]

(Beyond Pesticides, July 19, 2023) A study in Environment International (August issue) by the United States Geological Survey (USGS) finds that almost half of U.S. tap water is contaminated with PFAS chemicals, with measured concentrations in both private wells and public water sources. Authors of the study “estimate that at least one PFAS could be detected in about 45% of U.S. drinking-water samples.” Although there are more than 12,000 different types of PFAS, only 32 are detectable by USGS lab tests, so 45% is likely a low estimate.  Per- and polyfluoroalkyl substances (PFAS) are a group of chemicals found in a variety of common household products such as nonstick pans and stain resistant carpeting, as well as pesticides and biosolids used as fertilizer. Long-chain PFAS, such as PFOA and PFOS, are more widely known because of their high toxicity and controversial use in the past. Today, long-chain PFAS are often replaced with short-chain PFAS, as the latter are not as bioaccumulative; however, short-chained PFAS also pose a significant threat because they remain highly persistent in the environment. Past Beyond Pesticides’ articles have described the prevalence of PFAS in products as well as their negative health consequences, including cancer, decreased fertility, […]