Multiple PFAS Forever Chemicals Found in 98.5% of US Blood Samples in Major Study

A groundbreaking study has revealed the staggering extent of per- and polyfluoroalkyl substances, commonly known as PFAS or 'forever chemicals,' in the American bloodstream. Researchers analyzed over 10,500 blood samples and found these persistent pollutants in an astonishing 98.8 percent of tests, with 98.5 percent of individuals carrying multiple types simultaneously. This large-scale analysis underscores a pervasive environmental health challenge that demands urgent attention from scientists, policymakers, and the public alike.

PFAS represent a vast family of around 10,000 synthetic chemicals engineered for their resistance to heat, water, and stains. Introduced in the mid-20th century, they revolutionized industries by appearing in nonstick cookware like Teflon, water-repellent fabrics, stain-resistant carpets, firefighting foams, and food packaging. However, their indestructible nature means they accumulate in the environment and human bodies without breaking down, earning their ominous 'forever' moniker. Once inside, PFAS can linger for years—some with half-lives spanning decades—potentially disrupting biological processes over time.

🔬 Unpacking the Landmark NMS Labs Study

The study, titled 'PFAS co-positivities identified in more than 10,000 serum/plasma samples,' was led by Dr. Laura Labay, Principal Toxicologist at NMS Labs, and published in the Journal of Occupational and Environmental Hygiene. It examined 10,566 serum and plasma samples, one of the largest datasets of its kind, testing for 13 or 18 specific PFAS compounds depending on the sample. Detection limits were set at 0.1 ng/mL, a conservative threshold to capture even trace exposures.

Key results painted a picture of ubiquitous contamination: only 0.18 percent of samples contained a single PFAS, while the vast majority harbored mixtures. When testing the core 13 PFAS, researchers identified 58 unique combinations, with the most prevalent—a mix of five including legacy compounds like perfluorooctane sulfonate (PFOS), perfluorooctanoic acid (PFOA), and their replacements—appearing in 26.1 percent of cases. Linear PFOA alone showed up in 97.9 percent of samples, a chemical now restricted globally due to its toxicity profile.

This wasn't a random population survey but an observational snapshot from clinical and forensic samples, providing a real-world view of co-exposures. The findings highlight that PFAS rarely assault the body in isolation; instead, synergistic mixtures with varying bioaccumulation rates and half-lives complicate risk assessments.

Historical Context: Aligning with CDC's NHANES Data

The NMS Labs results echo long-term monitoring by the Centers for Disease Control and Prevention (CDC) through the National Health and Nutrition Examination Survey (NHANES). Since 1999, NHANES has tracked PFAS in representative U.S. blood samples, consistently finding detectable levels in over 97 percent of participants. Legacy PFAS like PFOS and PFOA peaked in the early 2000s but have declined by 85 percent and 70 percent respectively by 2018-2019, thanks to voluntary phase-outs by manufacturers like 3M and DuPont.

Yet, the picture isn't improving overall. Replacement PFAS—shorter-chain variants designed to evade regulations—have filled the gap, maintaining high body burdens. Recent NHANES cycles show emerging compounds like PFHpS detectable in 78 percent of the population. The NMS study extends this by quantifying mixtures, revealing how 98.5 percent prevalence of multiples amplifies potential interactions not captured in single-compound analyses.

Primary Pathways of PFAS Exposure

Americans encounter PFAS daily through contaminated drinking water, food, consumer products, and air. The Environmental Protection Agency (EPA) estimates 158 million people drink water with detectable PFAS, often from industrial sites, airports, and military bases using aqueous film-forming foams (AFFF). Wastewater treatment plants fail to remove them fully, discharging into rivers—studies find elevated levels downstream in 95 percent of cases.

Food chains amplify risks: PFAS bioaccumulate in fish, dairy, and produce irrigated with tainted water. Fast-food wrappers, microwave popcorn bags, and pizza boxes leach the chemicals during use. At home, they're in cosmetics, menstrual products, carpets, and upholstery. Children face higher exposures via hand-to-mouth behaviors and dust ingestion, while occupational groups like firefighters see spikes from AFFF.

• Drinking water: Primary route for ~70 percent of intake in contaminated areas
• Consumer products: Stain- and water-resistant items contribute ongoing dermal and inhalation exposure
• Diet: Fish from polluted waters and packaged foods account for 20-30 percent
• Indoor air/dust: Especially in older homes with treated fabrics

Health Consequences: From Cellular Disruption to Chronic Disease

PFAS interfere with multiple systems by binding to proteins, mimicking hormones, and altering gene expression. Epidemiological evidence links them to kidney and testicular cancers, with the International Agency for Research on Cancer (IARC) classifying PFOA as 'carcinogenic to humans.' High cholesterol is another hallmark, raising cardiovascular risks—NHANES data show dose-dependent increases.

Immune suppression is profound: Children with elevated PFAS exhibit 40-60 percent weaker antibody responses to vaccines. Thyroid disruption affects metabolism and development, while liver enzyme elevations signal toxicity. Reproductive harms include reduced fertility, low birth weights, and preeclampsia. Emerging research ties mixtures to accelerated biological aging, particularly in men over 50, via epigenetic changes.

Real-world cases abound: Communities near Chemours and DuPont plants in North Carolina and West Virginia report clusters of cancers and thyroid disease, prompting multimillion-dollar settlements. A 2026 EPA review confirmed associations across 10+ health endpoints, urging mixture studies like the NMS findings.

Vulnerable Groups and Disparities

Not all exposures are equal. Pregnant women pass PFAS to fetuses via placenta, with 2026 studies showing higher cord blood levels than maternal. Infants ingest via breast milk, where concentrations vary by maternal diet and location. Low-income and minority communities bear disproportionate burdens—Black and Hispanic Americans show 20-50 percent higher serum levels per NHANES, linked to industrial proximity and subpar water infrastructure.

Firefighters average 10x general population levels from AFFF, correlating with cancers. Older adults face compounded risks as half-lives extend effective exposure. The NMS data, while broad, likely underrepresents these hotspots, emphasizing targeted biomonitoring.

Evolving Regulatory Landscape in 2026

Federal action accelerated with the 2024 EPA National Primary Drinking Water Regulation, capping six PFAS (PFOA, PFOS, PFHxS, PFNA, HFPO-DA, mixtures) at 4-10 ppt. Public systems must monitor by 2027, with 10 percent already compliant via advanced treatment. The PFAS Regulation and Accountability Act of 2026 phases out non-essential uses over 10 years, mandating reporting since 2011.

States lead: By 2026, 20+ have stricter limits—Maine at 20 ppt total PFAS, California banning in textiles. Nearly 200 bills target products, biosolids, and foam. CDC's PFAS biomonitoring factsheet tracks progress, showing declines where interventions succeed.

Practical Solutions: Reducing Personal Exposure

Individuals can act now. Certified reverse osmosis (NSF/ANSI 58) or granular activated carbon (GAC, NSF/ANSI 53) filters remove 90-99 percent of PFAS—test water first via labs. Avoid nonstick cookware (opt stainless/ cast iron), stain treatments, and fast food wrappers. Ventilate homes, wet-mop dust, and choose PFAS-free products via apps like EWG's guide.

Communities push remediation: Pump-and-treat, in-situ destruction like plasma tech. Policy advocates for full AFFF phase-out by 2026 DOD mandate.

Photo by Provincial Archives of Alberta on Unsplash

• Test home water: Free kits in high-risk areas
• Filter effectively: RO for point-of-use, whole-house GAC
• Product swaps: Ceramic cookware, organic cotton
• Advocacy: Support local bans, fund research

Future Directions: Research and Mitigation

The NMS study calls for mixture toxicology—how do five PFAS interact? Universities ramp up: NC State probes bumblebee impacts, Penn State blood sugar links. Funding surges via EPA grants, birthing careers in environmental health.

Outlook: With regulations biting, legacy PFAS may wane, but 4,000+ replacements loom. Global pacts like Stockholm Convention expand. Proactive science, paired with innovation, promises cleaner futures.

This crisis, while daunting, spotlights collective power—research illuminates, policy protects, actions empower.