Environmental Toxins in America: What’s in Your Water, Food, and Air

Table of Contents

• I. Introduction: Environmental Toxins in Modern America
• II. How Do Environmental Toxins Get Into Your Body?
• III. PFAS: The “Forever Chemicals”
• IV. Pesticides and Glyphosate: How Much Is in Our Food?
• V. Microplastics: They’re Inside Us — What Does That Mean?
• VI. What Are Endocrine Disruptors — and Why Do Scientists Worry About Them?
• VII. BPA and Phthalates in Consumer Products
• VIII. Air Pollution and Particulate Matter
• IX. Heavy Metals
• X. Contamination in Drinking Water
• XI. Toxins in the Food Supply
• XII. How Do Environmental Toxins Damage the Body?
• XIII. Who Is Most Vulnerable?
• XIV. The Regulatory Landscape
• XV. The Real Problem: You’re Exposed to Dozens of Chemicals at Once
• XVI. What the Evidence Adds Up To
• Frequently Asked Questions

I. Introduction: Environmental Toxins in Modern America

The Centers for Disease Control and Prevention tests Americans’ blood for environmental chemicals, and the findings are striking. PFAS, known as the “forever chemicals,” show up in the blood of nearly all Americans tested [1]. Glyphosate, the world’s most-used herbicide, appears in 81% [2]. BPA, an endocrine disruptor found in food packaging, is in roughly 93% [3].

These numbers come from the CDC’s biomonitoring program, part of the National Health and Nutrition Examination Survey (NHANES), which measures chemicals and their metabolites in blood and urine samples from a nationally representative population [4]. CDC’s broader environmental exposure report materials, updated in 2024, provide biomonitoring data across hundreds of environmental chemicals in the U.S. population [5]. The report shows that measurable levels of synthetic chemicals — including PFAS, pesticide metabolites, phthalates, BPA, heavy metals, and volatile organic compounds — are present in a large share of the population tested.

What does widespread chemical exposure mean for human health? The World Health Organization (WHO) estimates that environmental risk factors contribute to a significant share of the global disease burden, including cancers, cardiovascular disease, respiratory illness, and neurodevelopmental disorders [6]. In the United States, chronic diseases account for approximately 90% of the nation’s $4.9 trillion in annual healthcare spending [7], and a growing body of research links environmental chemical exposures to many of these conditions.

This guide examines what the scientific evidence shows about the major classes of environmental toxins Americans encounter, how exposure occurs, what health effects have been documented, and how the regulatory landscape in the United States compares with international standards. It draws on government agency data, peer-reviewed research, and official reports from recognized scientific bodies. 

II. How Do Environmental Toxins Get Into Your Body?

Environmental toxins reach the human body through four primary routes: inhalation, ingestion, dermal (skin) absorption, and transplacental transfer from mother to fetus [8]. Understanding these pathways is the foundation for understanding exposure.

Inhalation is the primary route for airborne pollutants, including particulate matter (PM2.5), volatile organic compounds (VOCs), and industrial emissions. The lungs provide a large surface area for absorption, and fine particles can penetrate deep into lung tissue and enter the bloodstream [9].

Ingestion accounts for exposure through food, drinking water, and incidental hand-to-mouth contact, particularly important in young children. Pesticide residues on food, PFAS in drinking water, heavy metals in contaminated soil, and chemicals leaching from food packaging all enter the body through this route [10].

Dermal absorption occurs when chemicals in personal care products, cleaning agents, or contaminated surfaces pass through the skin. Phthalates in lotions, BPA on thermal receipt paper, and pesticides on treated surfaces are common examples [11].

Transplacental transfer is the passage of chemicals from a pregnant woman's bloodstream to the developing fetus through the placenta. Research has documented the presence of PFAS, heavy metals, pesticides, phthalates, and microplastics in placental tissue and cord blood [12][13].

Once in the body, different chemicals behave differently. Some are metabolized and excreted relatively quickly. BPA, for example, has a biological half-life commonly reported at approximately six hours, though research indicates the actual elimination half-life may be longer [14]. Others persist. PFAS compounds can remain in the human body for years, with half-lives ranging from approximately 2.7 to 5.3 years depending on the specific compound [15]. Heavy metals such as lead can accumulate in bone tissue over decades [16].

The concept of “body burden” refers to the total amount of a chemical present in the body at any given time. CDC biomonitoring data show that Americans carry measurable levels of many environmental chemicals simultaneously [5]. That cumulative reality, rather than one-chemical-at-a-time exposure, is an important consideration for understanding environmental toxin risk.

III. PFAS: The “Forever Chemicals”

Per- and polyfluoroalkyl substances (PFAS) are a class of thousands of synthetic chemicals characterized by strong carbon-fluorine bonds, which make them exceptionally resistant to degradation in the environment [17]. That persistence is why they are commonly called “forever chemicals.” PFAS have been manufactured since the late 1940s and are used in nonstick cookware, water-resistant clothing, food packaging, firefighting foams, and a wide range of industrial applications [18].

Where Does PFAS Exposure Occur?

PFAS exposure is pervasive in the United States. CDC biomonitoring data show that PFAS compounds are detectable in the blood of nearly all Americans tested [1]. Exposure occurs through multiple pathways: contaminated drinking water is one of the most significant, particularly near military bases, airports, and industrial facilities where PFAS-containing firefighting foams and industrial releases have contributed to contamination [19]. PFAS also enter the body through food, both from contaminated water sources used in agriculture and from food packaging materials [20]. Consumer products, including nonstick cookware, stain-resistant fabrics, and some cosmetics, are additional sources [18].

What Does the Science Show?

The health effects of PFAS exposure have been studied extensively. The Agency for Toxic Substances and Disease Registry (ATSDR) published a comprehensive Toxicological Profile for PFAS in 2021, identifying associations between PFAS exposure and several health outcomes [21]. Reported associations include increased cholesterol levels, changes in liver enzymes, decreased antibody response to some vaccines in children, kidney and testicular cancer, and pregnancy-induced hypertension or preeclampsia. Impaired fertility and thyroid-related effects have been documented, but results remain inconsistent across studies [22].

The International Agency for Research on Cancer (IARC) classified perfluorooctanoic acid (PFOA) as a Group 1 carcinogen (carcinogenic to humans) and perfluorooctane sulfonic acid (PFOS) as a Group 2B carcinogen (possibly carcinogenic to humans) in 2023 [23].

What Is the U.S. Regulatory Standard?

In April 2024, the EPA finalized the first national drinking water standard for PFAS, setting maximum contaminant levels (MCLs) at 4 parts per trillion (ppt) for PFOA and PFOS individually, and 10 ppt for PFHxS, PFNA, and HFPO-DA (GenX chemicals) [24]. Public water systems are being phased into compliance over several years. This marked a major regulatory shift: before 2024, PFAS in drinking water were subject only to non-enforceable health advisories.

How Does the U.S. Compare Internationally?

The European Union has proposed a broad restriction on the manufacture and use of PFAS under its chemicals framework, which would phase out many PFAS applications [25]. Other jurisdictions have also proposed or adopted narrower PFAS restrictions. The U.S. approach has focused primarily on drinking water standards and some state-level product bans.

IV. Pesticides and Glyphosate: How Much Is in Our Food?

Pesticides are chemical substances designed to prevent, destroy, or control organisms deemed harmful to agricultural production, public health, or human comfort. The United States is one of the largest users of pesticides globally, with approximately 1.1 billion pounds of conventional pesticides applied annually [26].

Glyphosate: The Most Widely Used Herbicide

Glyphosate is the active ingredient in Roundup and the most widely used herbicide in the world. In the United States, agricultural use of glyphosate increased approximately 300-fold between 1974 and 2014, driven by the adoption of genetically modified glyphosate-tolerant crops [27]. The U.S. Geological Survey has documented glyphosate and its degradation product AMPA as prevalent contaminants in streams and rivers. A 2020 study found glyphosate in 66 of 70 U.S. streams and rivers [28].

CDC biomonitoring data from the 2013–2014 NHANES cycle showed glyphosate detectable in approximately 81% of urine samples from the U.S. population [2]. Dietary exposure is one important route; the CDC notes that fruits, fruit juices, vegetables, and cereals are possible sources, and the FDA monitors glyphosate residues in food [29].

The Glyphosate Classification Disagreement

The safety of glyphosate remains one of the most contested issues in toxicology and regulation. In 2015, IARC classified glyphosate as “probably carcinogenic to humans” (Group 2A), based on evidence of non-Hodgkin lymphoma in epidemiological studies and sufficient evidence of carcinogenicity in animal studies [30]. The EPA, however, concluded in its interim registration review decision that glyphosate is “not likely to be carcinogenic to humans,” based on its own evaluation of the evidence [31]. In 2022, the Ninth Circuit held that EPA’s human-health analysis was not adequately supported, forcing the agency to revisit parts of that assessment [32].

The disagreement stems from different methodologies: IARC evaluates whether a substance can cause cancer under any circumstances (hazard identification), while EPA evaluates whether it is likely to do so at typical exposure levels (risk assessment) [30][31].

Organophosphate Pesticides and Children

Beyond glyphosate, organophosphate pesticides have drawn particular concern for children’s neurodevelopment. The American Academy of Pediatrics has published policy statements noting that children’s exposure to pesticides is associated with pediatric cancers, decreased cognitive function, and behavioral problems [33]. Epidemiological research has linked prenatal organophosphate exposure to reduced IQ in children [34].

U.S. vs. European Approach

The European Union has not renewed the approval of several pesticides that remain in use in the United States, including chlorpyrifos (which the EPA banned for food-use applications in 2022). The EU's regulatory approach applies the precautionary principle more broadly, while the U.S. system generally requires demonstration of harm before restricting use [35].

V. Microplastics: They’re Inside Us. What Does That Mean?

Plastic particles smaller than a grain of sand are now turning up inside human bodies. Microplastics are plastic particles smaller than 5 millimeters in diameter, as defined by the National Oceanic and Atmospheric Administration (NOAA) [36]. Nanoplastics — particles smaller than 1 micrometer — are an even smaller subset that has become a growing focus of research. These particles originate from the breakdown of larger plastic products, industrial processes, synthetic textiles, tire wear, and microbeads in personal care products [37].

How Widespread Is Exposure?

Microplastic contamination is now documented across virtually every environment studied, from deep ocean sediments to Arctic ice to urban air. Microplastics have also been detected inside the human body.

A 2022 study published in Environment International detected and quantified microplastic particles in human blood, finding measurable concentrations in 17 of 22 healthy adult donors [38]. Subsequent research has detected microplastics in human lung tissue and placental tissue [12][39]. A 2024 study published in the Proceedings of the National Academy of Sciences used advanced imaging techniques to detect an average of approximately 240,000 nanoplastic particles per liter of bottled water, far more than earlier estimates based on older detection methods [40].

What Are the Health Concerns?

The health effects of microplastic exposure in humans remain an active research area with substantial uncertainty. The World Health Organization published an assessment noting that microplastics in drinking water do not appear to pose a health risk at current levels, while emphasizing the need for more research, particularly on nanoplastics and long-term exposure [41].

Laboratory and animal studies have identified several potential mechanisms of concern, including inflammation, oxidative stress, cytotoxicity, and the ability of microplastic particles to act as carriers for other toxic chemicals that adsorb to their surfaces [42]. Some researchers have also raised concerns about endocrine disruption, given that many plastics contain or carry chemicals with known hormonal activity [43].

It is still too early to draw firm conclusions about the relationship between the levels of microplastics detected in human tissue and specific measurable health outcomes. The National Academies of Sciences, Engineering, and Medicine has highlighted the need for standardized methods to measure exposure and assess health risks [44].

Regulatory Status

There is currently no U.S. federal regulatory standard for microplastics in food or drinking water. The European Union has moved further, implementing restrictions on intentionally added microplastics in products and building monitoring frameworks for microplastics in the environment [45]. California has established a statewide microplastics strategy and is developing monitoring standards for drinking water [46].

VI. What Are Endocrine Disruptors — and Why Do Scientists Worry About Them?

Some chemicals do not need to be present in large amounts to cause problems. Endocrine-disrupting chemicals (EDCs) are substances that interfere with the body’s hormonal system. The Endocrine Society defines EDCs as exogenous chemicals, or mixtures of chemicals, that can interfere with any aspect of hormone action [47]. WHO and UNEP jointly published a landmark assessment in 2013 identifying endocrine disruption as a global public health concern [48].

What Makes a Chemical an Endocrine Disruptor?

EDCs exert their effects through multiple mechanisms. Some mimic natural hormones, particularly estrogen, binding to hormone receptors and triggering biological responses at the wrong time or in the wrong tissue. Others block hormones from binding to their receptors. Still others interfere with the synthesis, transport, metabolism, or elimination of natural hormones [47][48].

What makes EDCs particularly concerning is that they can produce effects at very low doses, sometimes lower than those considered “safe” by traditional toxicological risk assessment. This phenomenon, known as non-monotonic dose-response, means that effects observed at high doses may not predict effects at low doses, and vice versa [47].

Major Classes of Endocrine Disruptors

Major EDCs Americans commonly encounter include:

• Bisphenol A (BPA) and some substitutes such as BPS and BPF
• Phthalates
• PFAS
• Certain pesticides
• Dioxins and PCBs
• Flame retardants such as PBDEs

Health Effects Linked to Endocrine Disruption

The Endocrine Society’s second scientific statement on EDCs, published in 2015, reviewed evidence linking endocrine disruptor exposure to a range of health effects across the lifespan [47]. These include reproductive disorders, metabolic effects, thyroid disruption, neurodevelopmental effects in children, hormone-sensitive cancers, and immune system changes.

Research has increasingly focused on developmental windows of susceptibility — fetal development, infancy, and puberty — when hormonal signaling guides tissue formation and organ development. Exposure during these periods can produce effects that may not become visible until years later [47][48].

U.S. vs. EU Regulatory Approach

The European Union’s REACH regulation explicitly identifies endocrine disruption as a criterion for restricting chemicals and has established a framework for identifying and regulating EDCs [49]. 

The United States does not have an equivalent system focused specifically on endocrine disruptors. EPA has developed an Endocrine Disruptor Screening Program (EDSP), but progress has been slow relative to the number of chemicals in commerce [50].

VII. BPA and Phthalates in Consumer Products

Bisphenol A (BPA) and phthalates are among the most studied endocrine-disrupting chemicals. Both are common in consumer products, and both are detected in the bodies of many Americans.

Bisphenol A (BPA)

BPA is a synthetic chemical used primarily in the production of polycarbonate plastics and epoxy resins. It is found in food and beverage can linings, polycarbonate containers, water pipes, thermal receipt paper, and dental sealants [51].

CDC biomonitoring data from NHANES have consistently found detectable levels of BPA in approximately 93% of Americans aged six years and older [3]. Dietary exposure is considered a major route, particularly through food-contact materials [52].

Health effects: Research has associated BPA exposure with reproductive harm, metabolic disruption, cardiovascular effects, and neurobehavioral effects in children [53]. The National Toxicology Program has expressed “some concern” for effects on brain, behavior, and the prostate gland in fetuses, infants, and children at current human exposure levels [54].

“BPA-free” alternatives: Following public concern and manufacturer phaseouts, many companies shifted to substitutes such as bisphenol S (BPS) and bisphenol F (BPF). Emerging research suggests some substitutes may have similar endocrine-disrupting properties [55]. This is a classic example of “regrettable substitution” — replacing one problematic chemical with a structurally similar alternative that may pose similar concerns.

Regulatory status: FDA maintains that BPA is safe at current exposure levels in food-contact applications, based on its most recent safety assessment [56]. The European Union has taken a more restrictive approach: the European Food Safety Authority dramatically lowered its tolerable daily intake for BPA in 2023, and the EU has moved toward broader restrictions [57].

Phthalates

Phthalates are a group of chemicals used to make plastics more flexible and to act as solvents in some personal care products. They are found in vinyl flooring, shower curtains, food packaging, medical devices, fragranced products, nail polish, and hair spray [58].

CDC biomonitoring data show that phthalate metabolites are commonly detected in the urine of the U.S. population [59].

Health effects: The National Academy of Sciences published a major report in 2008, Phthalates and Cumulative Risk Assessment: The Tasks Ahead, concluding that phthalates are widely used chemicals that have been shown to affect development of the male reproductive system in laboratory animals and that their risks should be evaluated using cumulative risk assessment approaches rather than one chemical at a time [60]. Human epidemiological research has added to those concerns: one study found that higher prenatal exposure to antiandrogenic phthalates was associated with less male-typical play behavior in boys, consistent with the idea that prenatal exposure may influence androgen-responsive aspects of brain development [61]. Another study linked prenatal phthalate exposure to changes in childhood behavior and executive functioning, reinforcing concerns that some phthalates may affect neurodevelopment in children [62].

Regulatory status: The Consumer Product Safety Improvement Act of 2008 permanently banned three phthalates (DEHP, DBP, BBP) and placed interim restrictions on three others in children’s toys and child care articles [63]. The EU’s REACH regulation restricts several phthalates more broadly, including in food-contact materials [49]. Several phthalates remain in widespread use in other product categories in the United States.

VIII. Air Pollution and Particulate Matter

Air pollution is one of the most studied environmental health risks globally. The EPA identifies six criteria air pollutants regulated under the Clean Air Act: particulate matter, ground-level ozone, carbon monoxide, sulfur dioxide, nitrogen dioxide, and lead [64]. Among these, fine particulate matter (PM2.5 ) poses the greatest documented risk to human health.

What Is PM2.5?

PM2.5 refers to airborne particles approximately 30 times smaller than a human hair. Their small size allows them to penetrate deep into the lungs and enter the bloodstream [9]. Sources include vehicle emissions, power plant emissions, industrial processes, wildfires, agricultural burning, and residential wood burning. Indoor sources include cooking, candles, and certain cleaning products [64].

Health Effects

The EPA’s Integrated Science Assessment for Particulate Matter concluded that long-term PM2.5 exposure has a causal relationship with cardiovascular effects and mortality, and a “likely to be causal” relationship with respiratory effects [65].

THe WHO updated its air quality guidelines in 2021, lowering the recommended annual mean PM2.5 concentration from 10 µg/m³ to 5 µg/m³ [66]. The current U.S. annual PM2.5 standard, revised by EPA in 2024, is 9 µg/m³ [67].

Who Is Affected?

The American Lung Association’s State of the Air report consistently finds that over 100 million Americans live in counties with unhealthy air quality [68]. Air pollution exposure is not equally distributed: communities of color and low-income neighborhoods are disproportionately located near highways, industrial facilities, and power plants [69]. EPA environmental justice data have documented these disparities across multiple pollutant categories [70].

Indoor Air Quality

Americans spend approximately 90% of their time indoors, where concentrations of some pollutants can be higher than outdoors [71]. Indoor air quality concerns include VOCs from building materials and household products, formaldehyde, radon, and combustion byproducts from gas stoves and heating.

IX. Heavy Metals

Heavy metals — including lead, mercury, arsenic, and cadmium — are persistent environmental hazards because they do not break down and can accumulate in ecosystems and the body over time.

Lead

Lead is one of the most thoroughly studied environmental toxins. The CDC has stated unequivocally that there is no safe level of lead in the blood of children [73].

Lead exposure in the United States has declined dramatically since the phase-out of leaded gasoline and the 1978 ban on residential lead-based paint, but legacy contamination remains a major concern. HUD’s American Healthy Homes Survey II found that 34.6 million U.S. homes contain lead-based paint, including 21.9 million with dust lead hazards [74]. Lead in drinking water, primarily from lead service lines, gained national attention during the Flint, Michigan, water crisis that began in 2014 [75].

Health effects of lead exposure include neurodevelopmental impairment in children, kidney damage, cardiovascular effects, and reproductive harm [76]. Lead accumulates in bone, where it can remain for decades and later be mobilized back into the bloodstream [16].

Mercury

Mercury enters the environment primarily through coal-fired power plant emissions, small-scale gold mining, and natural volcanic activity. In aquatic environments, inorganic mercury is converted by bacteria into methylmercury: an organic form that bioaccumulates in fish, reaching the highest concentrations in large predatory species [77].

For most Americans, the primary exposure pathway is consumption of contaminated fish. IARC classifies methylmercury compounds as Group 2B (possibly carcinogenic to humans) [78]. The primary health concern with prenatal methylmercury exposure is neurodevelopment, as in utero exposure has been associated with deficits in language, attention, memory, and, to a lesser extent, visuospatial and motor function in children [79].

Arsenic

Arsenic is found naturally in groundwater in many regions of the United States, with particularly high concentrations in parts of the Southwest, Midwest, and New England [80]. It is also present in rice and in some treated wood products [81].

IARC classifies arsenic and inorganic arsenic compounds as Group 1 carcinogens, with strong evidence for skin, lung, and bladder cancer [82]. Long-term exposure to arsenic in drinking water is also associated with cardiovascular disease, diabetes, and developmental effects [83]. The current EPA maximum contaminant level for arsenic in drinking water is 10 parts per billion (ppb) [84].

Cadmium

Cadmium exposure occurs primarily through tobacco smoke, diet, and occupational exposure in industries such as battery manufacturing and metal smelting [85]. IARC classifies cadmium and cadmium compounds as Group 1 carcinogens, with sufficient evidence for lung cancer [82].

X. Contamination in Drinking Water

Drinking water is one of the most direct pathways through which Americans are exposed to environmental toxins. While the U.S. public water supply is regulated under the Safe Drinking Water Act (SDWA), major contamination challenges remain, from aging infrastructure to contaminants that regulations have not fully caught up with [86].

What Contaminants Are Found in U.S. Drinking Water?

The EPA regulates approximately 90 contaminants in drinking water under the SDWA, setting enforceable maximum contaminant levels [87].

Many contaminants of concern, however, have historically fallen outside the regulated list. PFAS were unregulated in drinking water until 2024, when EPA established MCLs for six PFAS compounds [24]. Other unregulated contaminants include perchlorate, 1,4-dioxane, and some pharmaceutical and personal care product residues that have been detected in water supplies [88].

PFAS in Drinking Water

PFAS contamination in drinking water affects millions of Americans. USGS research estimates that at least 45% of U.S. tap water contains one or more PFAS compounds [89]. Contamination is especially concentrated near military installations, airports, and industrial facilities [19].

The 2024 EPA PFAS rule requires public water systems to reduce PFOA and PFOS to 4 ppt and three other PFAS compounds to 10 ppt [24]. Public water systems are being phased into compliance over several years.

Lead in Drinking Water

Lead enters drinking water primarily through corrosion of lead service lines — the pipes connecting water mains to individual homes — and from lead solder, fixtures, and fittings. EPA has estimated that millions of lead service lines remain in use across the United States, although different estimates vary [90]. In 2024, EPA finalized the Lead and Copper Rule Improvements, requiring water systems to replace lead service lines on a national timeline [91].

Agricultural and Industrial Contamination

In rural areas, agricultural runoff introduces nitrates, pesticides, and sediment into drinking water sources [92]. Industrial contamination affects specific communities, including those near mining operations, chemical manufacturing facilities, and waste disposal sites. The USGS National Water Quality Assessment Project monitors contaminant trends across U.S. watersheds [93].

Infrastructure Challenges

The American Society of Civil Engineers has consistently given U.S. drinking water infrastructure grades in the C-to-D range, citing aging pipes, funding gaps, and the challenge of addressing emerging contaminants [94]. Small and under-resourced systems often face greater compliance challenges.

XI. Toxins in the Food Supply

The food Americans eat is a significant pathway for environmental chemical exposure. Pesticide residues, heavy metals, PFAS, BPA, phthalates, and other contaminants can enter the food supply through agricultural practices, food processing and packaging, and contamination of farmland and water sources.

Pesticide Residues in Food

The USDA Pesticide Data Program tests thousands of food samples annually for pesticide residues [96]. The program consistently finds that most food samples contain detectable pesticide residues, though most fall below EPA tolerance levels. Glyphosate residues — not routinely tested in the program until recently — have also been documented in oats, cereals, crackers, and other grain-based products through FDA monitoring and independent testing [29][97].

The distinction between “below tolerance levels” and “safe” still matters. EPA tolerance levels are legal residue limits derived through pesticide-specific risk assessments, and current reviews do consider aggregate exposure and cumulative effects for pesticides that share a common mechanism of toxicity. Still, the National Academy of Sciences has warned that traditional pesticide risk-assessment approaches may not always adequately protect vulnerable populations such as infants and children and that multiple sources of exposure should be considered [98].

Heavy Metals in Baby Food

In February 2021, a U.S. House Subcommittee staff report documented dangerous levels of arsenic, lead, cadmium, and mercury in commercial baby food. The investigation found that major baby food manufacturers sold products containing toxic heavy metals at levels that sometimes exceeded their own internal testing standards [99].

The FDA then launched its Closer to Zero action plan in 2021; in January 2023, the agency issued draft guidance proposing action levels for lead in foods intended for babies and young children, and in January 2025, it issued final guidance establishing action levels for lead in processed foods intended for babies and young children, along with related monitoring and analytical updates [100]. In March 2025, HHS and FDA announced Operation Stork Speed, a comprehensive initiative to expand safe infant formula options and increase testing for heavy metals and other contaminants in infant formula and foods consumed by children [123].

Chemical Migration from Food Packaging

Food packaging is a documented source of chemical exposure. PFAS have been used in grease-resistant food packaging — including fast food wrappers, microwave popcorn bags, and takeout containers — and can migrate into food [20]. BPA can leach from epoxy linings in canned foods, with migration increasing when cans are heated [51]. Phthalates can also enter food from plastic wrapping and processing equipment [58].

The FDA regulates food-contact substances under the Federal Food, Drug, and Cosmetic Act, but the regulatory framework relies heavily on manufacturer safety assessments. The Government Accountability Office has identified gaps in FDA oversight of food ingredients and food-contact chemicals, including the use of the GRAS pathway that allows manufacturers to make some safety determinations without FDA review [101].

Organic vs. Conventional Food

Research generally finds lower pesticide residue levels on organically grown food than on conventionally grown food [102]. That does not mean “organic” is pesticide-free; organic farming still permits certain natural and approved synthetic pesticides. The health significance of the difference remains debated, although some studies have found measurable reductions in urinary pesticide metabolites when participants switch to organic diets [103].

XII. How Do Environmental Toxins Damage the Body?

Environmental toxins affect human health through multiple biological mechanisms. That helps explain why low-level, chronic exposures can produce effects that are easy to miss in the short term.

Oxidative Stress and Inflammation

Many environmental stressors, including pollutants and heavy metals, can increase reactive oxygen species (ROS) production and contribute to oxidative stress [104]. In turn, oxidative stress can lead to cell and tissue damage [104]. 

DNA Damage and Epigenetic Modification

Some environmental toxins can damage DNA or interfere with DNA repair. Environmental chemicals can also alter gene expression through epigenetic mechanisms: chemical modifications that affect how genes are read without changing the DNA sequence itself. Some epigenetic changes can persist over time, and researchers continue to investigate whether any environmentally induced epigenetic alterations can be transmitted across generations [105]. 

Endocrine Disruption

As described above, endocrine-disrupting chemicals interfere with hormonal signaling at multiple levels: mimicking hormones, blocking receptors, or disrupting hormone synthesis and metabolism [47]. Because the endocrine system regulates virtually every organ system, EDC exposure has been linked to a wide range of health outcomes, from reproductive effects to metabolic disease to neurodevelopmental changes [48].

Immune System Effects

Research has linked several environmental chemicals to immune effects. PFAS exposure is associated with decreased vaccine antibody response in children [21]. Lead exposure can impair immune function in children [76]. Pesticide exposure has also been associated with altered immune parameters in agricultural workers [106].

Neurotoxicity

The developing brain is especially vulnerable to environmental chemicals. Lead, methylmercury, organophosphate pesticides, and certain solvents are established developmental neurotoxicants: chemicals that can impair brain development at exposure levels that may not produce obvious symptoms in adults [107]. A 2014 review in The Lancet Neurology identified a growing list of industrial chemicals linked to neurodevelopmental toxicity [108].

Carcinogenesis

IARC maintains one of the most widely used classification systems for carcinogenic substances. It classifies environmental agents into Group 1 (carcinogenic to humans), Group 2A (probably carcinogenic), Group 2B (possibly carcinogenic), and Group 3 (not classifiable) [109]. Among environmental agents discussed in this guide, IARC has classified arsenic and cadmium as Group 1 carcinogens, glyphosate as Group 2A, PFOS as Group 2B, and PFOA as Group 1 [23][30][82].

XIII. Who Is Most Vulnerable?

Environmental toxin exposure does not affect everyone equally. Biological factors, life stage, occupation, geography, and socioeconomic status all influence vulnerability.

Children

Children face heightened vulnerability for several reasons. Pound for pound, they eat more food, drink more water, and breathe more air relative to their body weight than adults, which can result in higher proportional exposure [110]. Children are especially vulnerable to certain environmental chemicals during critical windows of development. In particular, the developing brain is more susceptible, and exposures during early fetal development can cause injury at doses lower than those that affect adults [107].

The American Academy of Pediatrics has published policy statements documenting children’s unique susceptibility to pesticides [33], food additives [111], and environmental chemicals more broadly.

Pregnant Women and Developing Fetuses

The prenatal period is one of the most sensitive windows for environmental chemical exposure. Chemicals in the mother’s blood can cross the placenta and reach the developing fetus. Research has documented PFAS in fetal tissues and microplastics in placental tissue [12][13]. 

Prenatal exposure to lead is associated with reduced birth weight and neurodevelopmental effects [76]. Prenatal organophosphate pesticide exposure is linked to reduced IQ in children [34]. Prenatal phthalate exposure is associated with altered genital development in male infants [61].

Workers

Occupational exposure affects millions of American workers. Agricultural workers face elevated pesticide exposure [106]. Firefighters experience disproportionate exposure to PFAS from firefighting foam and to combustion byproducts [112]. Workers in manufacturing, construction, and mining may also face exposure to heavy metals, solvents, and other industrial chemicals.

Low-Income Communities and Communities of Color

Environmental justice research has consistently found that low-income communities and communities of color in the United States bear a disproportionate burden of environmental toxin exposure [69][70]. These communities are more likely to be located near industrial facilities, hazardous waste sites, major highways, and other polluting infrastructure. EPA’s environmental justice data and peer-reviewed research have documented these disparities across multiple indicators [70][114].

Older Adults

Older adults face cumulative lifetime exposure, age-related declines in detoxification and elimination capacity, and increased susceptibility to environmental stressors. Lead stored in bone can be mobilized during periods of bone loss, releasing previously stored lead back into circulation [16].

XIV. The Regulatory Landscape

The regulation of environmental chemicals in the United States involves multiple federal agencies, each with jurisdiction over specific exposure pathways. Understanding that structure is essential to understanding the country’s approach to chemical risk.

The Toxic Substances Control Act (TSCA)

TSCA is the primary federal law governing industrial chemicals. Originally passed in 1976 and significantly reformed by the Frank R. Lautenberg Chemical Safety for the 21st Century Act in 2016, TSCA gives EPA authority to evaluate and regulate chemicals in commerce [115]. The 2016 reform required EPA to evaluate existing chemicals against a safety standard, with mandatory deadlines for completing risk evaluations.

The scale of the challenge remains substantial. Tens of thousands of chemicals are listed on the TSCA Inventory [116]. The EPA is required to have ongoing risk evaluations for a limited number of chemicals at a time, and GAO has issued multiple reports identifying workforce and process problems that have contributed to missed deadlines and incomplete assessments [117].

EPA Drinking Water Standards

The Safe Drinking Water Act authorizes EPA to set enforceable standards for contaminants in public drinking water systems. Approximately 90 contaminants currently have established MCLs [87]. The addition of PFAS standards in 2024 was the first major expansion of federal drinking water regulation in more than two decades [24].

FDA Food Safety Regulation

The FDA regulates food additives, food-contact substances, and pesticide residue tolerances (in coordination with EPA). The GRAS process has been a long-running concern because it allows manufacturers to determine that some substances are safe without mandatory FDA review or public notice [101]. Both the AAP and GAO have raised concerns about that gap [111].

U.S. vs. EU: Two Approaches to Chemical Safety

The European Union’s chemicals framework differs from the U.S. model in several basic ways:

• Under REACH, industry generally bears more responsibility for demonstrating safety.
• Under TSCA, the government typically bears more of the burden of proving harm before imposing restrictions [49][115].
• The EU has built a more explicit framework for endocrine disruptors and has moved more aggressively on some chemical classes, including PFAS [49].

That does not make one system automatically superior in every respect, but it does explain why some chemicals restricted in Europe remain in use in the United States, and vice versa.

State-Level Action

In the absence of broad federal action, many states have moved ahead with their own chemical rules. California’s Proposition 65 requires warnings about significant exposures to chemicals known to cause cancer or reproductive harm [118]. Multiple states have enacted PFAS restrictions in food packaging, firefighting foam, and consumer products. Maine adopted one of the broadest state PFAS laws, establishing a phase-in framework for restricting intentionally added PFAS in products [119].

XV. The Real Problem: You’re Exposed to Dozens of Chemicals at Once

Perhaps the most fundamental challenge in understanding environmental toxin risk is that Americans are not exposed to one chemical at a time. CDC biomonitoring data show that individuals carry measurable levels of many environmental chemicals simultaneously [5]. Current regulation, however, still largely evaluates chemicals one by one.

The Mixture Problem

When multiple chemicals are present in the body at the same time, their effects may be additive, synergistic, or antagonistic. Research on chemical mixtures is still limited, but it is growing. The National Academy of Sciences has called for cumulative risk assessment approaches that better reflect how people are actually exposed [98].

Some of the clearest examples involve chemicals that share a common mechanism of action. The National Academy of Sciences concluded that certain phthalates should be assessed cumulatively rather than one by one [60]. The EPA has also developed cumulative assessment approaches for some pesticide classes that share a common mechanism [120].

Regulatory Gaps in Cumulative Assessment

The EPA has made progress on cumulative risk assessment for some chemical classes, particularly organophosphate pesticides [120]. But the agency does not routinely conduct cumulative assessments across different chemical classes, even when exposures co-occur and health endpoints overlap. That remains a major limitation in the current framework [117].

The Exposome

Scientists increasingly use the concept of the “exposome” — the totality of environmental exposures an individual experiences from conception onward — to frame environmental health research [121]. This approach recognizes that chemical exposures interact with diet, stress, microbiome composition, genetic susceptibility, and socioeconomic conditions to shape health outcomes.

What Can Individuals Do?

Systemic change requires regulation, but some practical steps can reduce individual exposure at the margins:

• Water: Use water filters that are certified for the specific contaminants you want to reduce. Different filtration technologies vary in what they can remove [122].
• Food: Wash produce thoroughly. When feasible, choose organic options for the most pesticide-intensive crops. Some studies find measurable reductions in urinary pesticide metabolites when people switch to organic diets [103].
• Indoor air: Ventilate living spaces. Use exhaust fans when cooking. Choose low-VOC paints and building materials. Test for radon.
• Consumer products: Read labels. Choose fragrance-free personal care products when possible. Reduce unnecessary plastic food contact and storage.
• Stay informed: Check local water quality reports. Monitor air quality indexes. Follow updates from EPA and state environmental agencies on contaminants in your area.

These are risk-reduction steps, not guarantees of safety.

XVI. What the Evidence Adds Up To

The evidence summarized in this guide shows that environmental chemical exposure in American life is widespread and measurable. 

• PFAS are detectable in the blood of nearly all Americans tested [1]. 
• Glyphosate, BPA, and phthalate metabolites are also commonly detected in U.S. biomonitoring data [2][3][59]. 
• Microplastics have been detected in human blood, lung tissue, and placental tissue [12][38][39]. 
• Air pollution continues to affect well over 100 million Americans living in counties with unhealthy air quality [68].

The science on many of these chemicals has progressed faster than regulation. The United States regulates approximately 90 contaminants in drinking water [87], while tens of thousands of chemicals are listed on the TSCA Inventory [116]. TSCA reform in 2016 improved the EPA’s authority, but the pace of assessment remains slow relative to the size of the problem [115][117]. International comparisons, especially with the European Union, show meaningful differences in how the burden of proof, precaution, and endocrine disruption are handled.

Several areas of research will shape the next phase of the debate: the health effects of nanoplastics, the cumulative impact of simultaneous exposure to multiple chemicals, the role of epigenetic changes, and the development of risk-assessment frameworks that better reflect real-world exposure mixtures.

Environmental toxin exposure is a public health issue, not just an individual-consumer issue. Personal choices can reduce exposure somewhat, but the scale of the problem ultimately depends on policy: stronger chemical safety standards, faster regulatory review, better water and air infrastructure, and continued investment in biomonitoring and health research.

Frequently Asked Questions

What Are Environmental Toxins?

Environmental toxins are chemical substances present in air, water, food, soil, and consumer products that can cause adverse health effects in humans. They include industrial chemicals like PFAS, pesticides like glyphosate, heavy metals like lead and mercury, air pollutants like PM2.5, and synthetic compounds like BPA and phthalates.

How Are Americans Exposed to Environmental Toxins?

Exposure occurs through four primary routes: inhalation, ingestion, dermal absorption, and transplacental transfer during pregnancy [8]. Most Americans are exposed to multiple environmental chemicals simultaneously through overlapping pathways.

What Are the Most Common Environmental Toxins in the United States?

Based on CDC biomonitoring data, commonly detected environmental chemicals in Americans include PFAS, BPA, glyphosate, and phthalate metabolites [1][2][3][59]. PM2.5 air pollution and microplastics are also widespread environmental exposures, although they are measured differently from blood and urine biomarkers.

Are Environmental Toxins Making Americans Sick?

The scientific evidence links environmental chemical exposures to a range of health effects, though the relationship between specific exposures and specific diseases is not always straightforward. Established associations include lead exposure and neurodevelopmental harm in children [76], air pollution and cardiovascular and respiratory disease [65], PFAS and several adverse health outcomes [21], and pesticide exposure and neurodevelopmental effects [34].

How Does U.S. Chemical Regulation Compare to Europe?

The EU and the U.S. take structurally different approaches. Under REACH, manufacturers generally shoulder more of the burden of demonstrating safety before a chemical remains on the market. Under TSCA, U.S. regulators generally carry more of the burden of proving harm before restricting a chemical [49][115]. The EU has also moved more aggressively on some chemical categories, including PFAS and endocrine disruptors [49].

What Can I Do to Reduce My Exposure to Environmental Toxins?

Evidence-based steps include using water filters certified for the contaminants you want to reduce, washing produce thoroughly, improving indoor ventilation, choosing fragrance-free personal care products when possible, and checking local water quality reports and air quality indexes [71][103][122].

Is “BPA-Free” Actually Safer?

Not necessarily. Many BPA-free products use structurally similar substitutes such as BPS or BPF, and emerging research suggests some may have comparable endocrine-disrupting properties [55].

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