PFAS Health Effects: What the Science Actually Says
PFAS & Water Quality
PFAS Health Effects: What the Science Actually Says
An evidence-based look at how PFAS exposure affects your body, which health effects have the strongest research behind them, and what you can do about it.
Yes, PFAS exposure is linked to real health risks. The EPA, CDC, IARC, and the National Academies of Sciences all agree that exposure to certain PFAS compounds is associated with adverse health effects, including increased cancer risk, thyroid disruption, immune system suppression, elevated cholesterol, and reproductive complications. In November 2023, the International Agency for Research on Cancer (IARC) classified PFOA as a Group 1 carcinogen (the highest category), meaning there is sufficient evidence it causes cancer in humans (IARC, 2023).
That said, the severity of the risk depends on the concentration, duration, and type of PFAS you are exposed to. Not all PFAS compounds carry the same risk, and the science is still evolving on many of the lesser-studied variants. This article walks through what we know, what is still uncertain, and what the research actually supports.
TL;DR: Key Facts About PFAS and Health
- PFOA is a confirmed human carcinogen (IARC Group 1, 2023). PFOS is classified as "possibly carcinogenic" (Group 2B).
- The EPA set enforceable drinking water limits of 4 parts per trillion (ppt) for PFOA and PFOS in April 2024, the strictest federal contaminant limits ever established.
- Nearly all Americans have measurable PFAS in their blood. NHANES data shows over 97% of the U.S. population has detectable PFAS levels.
- Health effects with the strongest evidence: kidney cancer, testicular cancer, elevated cholesterol, thyroid disruption, reduced vaccine response in children, and pregnancy complications.
- PFAS persist in your body for years. PFOA has a half-life of 2 to 8 years; PFOS has a half-life of 3 to 7 years. They are not metabolized and accumulate in your liver and kidneys.
- Children and pregnant women face elevated risk due to developmental vulnerability and placental transfer.
- The most effective treatment for PFAS in drinking water is activated carbon filtration, ion exchange, or reverse osmosis. The EPA's new standards require public water systems to treat to 4 ppt by 2029.
Sources: EPA, IARC, CDC/ATSDR, National Academies, 2022
What Makes PFAS Different from Other Contaminants
Most water contaminants break down over time. Iron oxidizes. Bacteria die. Chlorine dissipates. PFAS do none of these things. The carbon-fluorine bond that forms the backbone of every PFAS molecule is one of the strongest in organic chemistry, which means these compounds resist heat, water, oil, acids, and biological degradation. For the full picture on PFAS, including how they enter water supplies and what the EPA is doing, see our Complete PFAS Guide.
This persistence creates two problems that set PFAS apart from virtually every other drinking water contaminant:
They persist in the environment indefinitely
PFAS do not biodegrade, photolyze, or hydrolyze under normal environmental conditions. Once released into groundwater, surface water, or soil, they remain. The EPA has detected PFAS in drinking water systems across all 50 states, and the contamination is expected to last for decades to centuries without active treatment (EPA). For a state-by-state breakdown of contamination levels and risk, see our PFAS Contamination by State guide.
They accumulate in your body over years
Unlike most contaminants that your body filters and excretes within hours or days, PFAS bind to proteins in your blood and accumulate in your liver and kidneys. They are not metabolized. Renal reabsorption and enterohepatic circulation slow excretion to a crawl (CDC/ATSDR, 2024).
The result: PFAS levels in your body build up over months and years of exposure, and decline very slowly even after the exposure source is removed.
How Long PFAS Persist in the Human Body (Estimated Half-Life)
Sources: CDC/ATSDR Clinician Guide, 2024; Li et al., Occupational & Environmental Medicine, 2018
Nearly all Americans already carry measurable PFAS in their blood. According to NHANES data (2017 to 2018), the geometric mean serum PFOS concentration in the general U.S. population is 4.25 ng/mL, and PFOA is 1.42 ng/mL. Over 97% of Americans tested have detectable levels (CDC/ATSDR).
The good news: blood levels of PFOA and PFOS have declined significantly since manufacturers began phasing them out. PFOS levels dropped more than 85% and PFOA more than 70% between 1999 and 2018. But these compounds remain widespread, and many people continue to be exposed through contaminated drinking water, food packaging, and consumer products.
EPA Drinking Water Standards for PFAS
In April 2024, the EPA finalized the first-ever enforceable national drinking water standards for PFAS. These are among the strictest contaminant limits the EPA has ever set (EPA, 2024).
PFOA
Maximum Contaminant Level
4 ppt
MCLG (goal) set at zero. The EPA determined there is no safe level of PFOA exposure based on current evidence. The 4 ppt MCL reflects the lowest level achievable with current treatment technology.
PFOS
Maximum Contaminant Level
4 ppt
MCLG (goal) also set at zero. PFOS is classified as possibly carcinogenic by IARC and is associated with immune, liver, and developmental effects.
PFHxS, PFNA, HFPO-DA (GenX)
Maximum Contaminant Level
10 ppt
Individual limits for three additional PFAS compounds. MCLGs also set at 10 ppt.
PFAS Mixtures
Hazard Index
1.0
For mixtures containing two or more of PFHxS, PFNA, HFPO-DA, and PFBS. Accounts for the cumulative effect of multiple PFAS compounds in the same water supply.
What this means for homeowners: Public water systems must test for PFAS and reduce levels below these limits by 2029. If you are on a private well, no federal agency monitors your water. Testing and treatment are your responsibility. If your water has not been tested for PFAS, you do not know your exposure level.
Cancer Associations
Cancer is the health effect that generates the most concern around PFAS, and it is also the one with the most substantial body of evidence. Here is what the research supports:
IARC Classification (2023)
In November 2023, the International Agency for Research on Cancer (a division of the World Health Organization) evaluated PFOA and PFOS and issued the following classifications (IARC Monograph Volume 135):
- PFOA: Group 1, "Carcinogenic to Humans." This is the highest classification, the same category as asbestos, benzene, and tobacco smoke. The classification was based on sufficient evidence of cancer in laboratory animals, strong mechanistic evidence in humans, and limited but consistent epidemiological evidence linking PFOA to kidney cancer and testicular cancer.
- PFOS: Group 2B, "Possibly Carcinogenic to Humans." Based on strong mechanistic evidence but limited evidence in both humans and experimental animals.
C8 Science Panel Findings
The C8 Science Panel studied approximately 69,000 people living near DuPont's Washington Works plant in West Virginia, one of the most PFOA-exposed populations ever studied. The panel found a "probable link" between PFOA exposure and both kidney cancer and testicular cancer (Steenland et al., Environmental Health Perspectives, 2013).
USC Keck School of Medicine Study (2025)
A large-scale study from USC's Keck School of Medicine examined cancer incidence across U.S. counties from 2016 to 2021 and found that communities with PFAS-contaminated drinking water experienced up to 33% higher incidence of certain cancers. The study estimated that PFAS in drinking water contributes to approximately 4,600 to 6,900 cancer cases per year nationwide (Keck School of Medicine, USC).
Cancer Types with Evidence
| Cancer Type | Evidence Level | Key Sources |
|---|---|---|
| Kidney (renal cell) | Strong. C8 Science Panel "probable link." IARC cited limited but consistent human evidence. National Academies listed as associated. | C8 Panel; IARC 2023; NAS 2022 |
| Testicular | Strong. C8 Science Panel "probable link." Consistent across multiple studies. | C8 Panel; IARC 2023 |
| Thyroid | Suggestive. NIEHS and USC study found associations, particularly in women. | NIEHS; USC Keck 2025 |
| Bladder | Suggestive. Some epidemiological studies show elevated risk in exposed populations. | USC Keck 2025 |
| Liver | Suggestive. Animal evidence is strong; human evidence is emerging. | Yale; IARC 2023 |
| Breast | Limited. Some studies suggest association; others show no significant link. Research is ongoing. | Various epidemiological studies |
Important context: "Associated with" does not mean "causes." Epidemiological studies show a statistical relationship between PFAS exposure and certain cancers, but individual cancer risk depends on many factors: genetics, overall chemical exposure, lifestyle, and exposure duration. The IARC Group 1 classification for PFOA is the strongest statement available, meaning the evidence is sufficient to conclude PFOA can cause cancer in humans.
Thyroid Effects
Your thyroid gland regulates metabolism, energy, and growth. Multiple studies have found that PFAS exposure disrupts normal thyroid function, though the effects vary by compound and population group.
The C8 Science Panel found a "probable link" between PFOA exposure and thyroid disease in the 69,000-person study population. Since then, additional research has confirmed the association:
- Thyroid hormone disruption: PFAS exposure is associated with altered levels of thyroid hormones (T3, T4, TSH), particularly in women and adolescents. A 2024 NIEHS study found that higher serum PFAS concentrations were associated with increased thyroid cancer risk (NIEHS).
- Hypothyroidism: Several studies have found associations between PFAS exposure and clinical hypothyroidism (underactive thyroid), which causes fatigue, weight gain, cold sensitivity, and depression.
- Mechanism: PFAS compounds are structurally similar to thyroid hormones and may interfere with hormone transport, receptor binding, and metabolism. They also compete for binding sites on the protein transthyretin, which carries thyroid hormones in the blood.
Sources: CDC/ATSDR Health Effects, 2024; C8 Science Panel; NIEHS
Immune System Effects
Immune system suppression is one of the health effects where the evidence is strongest, and it is the health effect that most directly influenced the EPA's strict 4 ppt drinking water standard.
The National Academies of Sciences stated in their 2022 report that decreased antibody response is an established association with PFAS exposure (National Academies, 2022).
Vaccine Response in Children
The most consistent finding is that PFAS exposure reduces the body's ability to produce antibodies after vaccination. A 2023 systematic review and meta-analysis found approximately a 5% reduction in antibody levels for each doubling of PFOA concentration in the blood. The effect has been documented for diphtheria, tetanus, rubella, and influenza vaccines (Abraham et al., Environment International, 2023).
This matters most for children, whose immune systems are still developing and who depend on vaccine-induced immunity for protection against serious diseases.
Broader Immune Changes
Beyond vaccine response, PFAS exposure has been associated with:
- Changes in natural killer cell, T helper, and T cytotoxic cell populations (Environmental Research, 2024)
- Increased susceptibility to infections in children with higher PFAS serum levels
- Associations with inflammatory bowel disease and ulcerative colitis (C8 Science Panel "probable link")
Reproductive and Developmental Effects
PFAS cross the placenta and are found in breast milk, which means exposure begins before birth. The National Academies identified decreased infant and fetal growth as an established association with PFAS exposure.
Pregnancy Complications
- Preeclampsia: A 2025 systematic review found moderate associations between maternal PFOA and PFOS exposure and preeclampsia, a serious pregnancy complication involving high blood pressure that can threaten both mother and baby (BMC Pregnancy and Childbirth, 2025).
- Low birth weight: Multiple studies have found associations between higher maternal PFAS levels and reduced birth weight, though effect sizes are generally small (in the range of 10 to 30 grams per unit increase in PFAS concentration).
- Pregnancy-induced hypertension: The C8 Science Panel listed this as a "probable link" with PFOA exposure.
Developmental Effects
- Early puberty: Some studies have found associations between PFAS exposure and earlier onset of puberty, particularly in girls.
- Fertility: Research suggests possible associations between PFAS exposure and reduced fertility, including longer time-to-pregnancy and altered hormone levels, though the evidence is still developing.
Sources: CDC/ATSDR, 2024; NAS, 2022
Liver Effects and Cholesterol
The liver is one of the primary organs where PFAS accumulate, and liver-related effects are among the most well-documented health outcomes.
Elevated Cholesterol (Dyslipidemia)
The National Academies identified dyslipidemia (abnormal cholesterol levels) as an established association with PFAS exposure. The C8 Science Panel also found a "probable link" between PFOA and high cholesterol.
A 2025 meta-analysis confirmed that PFOA and PFOS exposure are significantly associated with increased total cholesterol and LDL ("bad" cholesterol). PFOA exposure was also associated with elevated triglycerides (European Journal of Epidemiology, 2025).
The mechanism: PFAS interfere with bile acid metabolism and bind to lipid transport proteins, disrupting the liver's normal regulation of cholesterol and fat processing.
Liver Damage Markers
A systematic review in Environmental Health Perspectives found that PFAS exposure is associated with elevated serum markers of liver injury (ALT, GGT), suggesting ongoing hepatic stress even at relatively common exposure levels (EHP, 2022).
Cardiovascular Effects
The cardiovascular connection is primarily indirect, operating through PFAS's documented effect on cholesterol:
- PFAS exposure raises total cholesterol and LDL, which are established risk factors for heart disease and stroke.
- A 2026 study found that PFAS exposure is associated with accelerated biological aging (2 to 4 years of epigenetic aging) in middle-aged men, which carries its own cardiovascular implications.
The evidence for direct cardiovascular effects (independent of cholesterol) is still limited and an active area of research. At this point, the primary concern is the well-documented cholesterol increase, which over time can contribute to atherosclerosis and cardiovascular disease.
PFAS Health Effects by Body System
This overview shows which organ systems are affected by PFAS exposure, based on the body of evidence described above.
Kidneys
Kidney cancer (IARC Group 1 for PFOA). PFAS accumulate in kidneys due to renal reabsorption.
Liver
Elevated liver enzymes, cholesterol disruption, fat accumulation. Primary PFAS storage organ.
Thyroid
Hormone disruption, hypothyroidism, thyroid cancer risk. PFAS compete with hormone transport proteins.
Immune System
Reduced vaccine antibody response. Changes in immune cell populations. Increased infection susceptibility.
Cardiovascular
Elevated LDL cholesterol and triglycerides. Indirect heart disease risk through lipid disruption.
Reproductive
Preeclampsia risk, low birth weight, possible fertility effects. PFAS cross the placenta.
Color indicates evidence strength: Red = Strong/Sufficient, Orange = Suggestive, Yellow = Limited/Emerging
Evidence Strength Summary
Not all PFAS health effects have the same level of scientific support. The table below categorizes each effect by the strength of current evidence, based on IARC, EPA, CDC/ATSDR, and National Academies assessments.
| Health Effect | Evidence Level | Key Supporting Evidence |
|---|---|---|
| Kidney cancer | Sufficient | IARC Group 1 (PFOA). C8 Panel "probable link." NAS listed as associated. Consistent across multiple study designs. |
| Testicular cancer | Sufficient | C8 Panel "probable link." IARC cited limited human evidence. Consistent occupational studies. |
| Elevated cholesterol | Sufficient | NAS listed as established association. C8 Panel "probable link." Meta-analyses confirm. |
| Decreased antibody response | Sufficient | NAS listed as established association. Meta-analyses show ~5% reduction per PFOA doubling. |
| Thyroid disease | Suggestive | C8 Panel "probable link." Multiple epidemiological studies. NIEHS thyroid cancer association. |
| Decreased fetal/infant growth | Suggestive | NAS listed as associated. Multiple birth cohort studies show reduced birth weight. |
| Preeclampsia | Suggestive | C8 Panel "probable link." 2025 meta-analysis confirms moderate association. |
| Liver damage | Suggestive | EHP meta-analysis shows elevated liver enzymes. Strong animal evidence. Mechanistic support. |
| Ulcerative colitis | Suggestive | C8 Panel "probable link." 2024 meta-analysis links PFAS to inflammatory bowel disease. |
| Thyroid cancer | Limited | USC Keck study found association in women. NIEHS notes possible increased risk. Research ongoing. |
| Fertility effects | Limited | Some studies show longer time-to-pregnancy and altered hormones. Results are mixed. |
| Breast cancer | Limited | Some epidemiological studies suggest association; others find no significant link. |
How to read this table: Sufficient = consistent evidence across multiple high-quality studies and expert panel assessments. Suggestive = meaningful evidence from multiple studies, but with some inconsistencies or limitations. Limited = preliminary evidence that warrants attention but requires additional research.
Risk by Population Group
PFAS affect everyone, but certain groups face greater vulnerability based on biology, life stage, or pre-existing conditions.
Infants and Young Children
Why higher risk: Developing immune and endocrine systems are more sensitive to disruption. Children have higher relative PFAS intake per body weight. Exposure begins in utero through placental transfer and continues through breast milk.
Key concerns: Reduced vaccine effectiveness, developmental delays, thyroid disruption during critical growth periods.
Pregnant Women
Why higher risk: PFAS cross the placenta. Pregnancy itself increases vulnerability to thyroid disruption and hypertensive disorders.
Key concerns: Preeclampsia, low birth weight, gestational hypertension. The NAS recommends clinicians discuss PFAS testing with pregnant patients who have elevated exposure histories.
Immunocompromised Individuals
Why higher risk: PFAS suppress immune function. People with already compromised immune systems (autoimmune diseases, cancer treatment, organ transplant recipients) may experience compounded effects.
Key concerns: Further reduction in antibody response, increased infection susceptibility.
Older Adults
Why higher risk: Longer lifetime of cumulative PFAS exposure. Higher prevalence of cardiovascular disease and cancer risk factors that PFAS may exacerbate.
Key concerns: Cholesterol elevation compounding existing cardiovascular risk, kidney cancer risk with prolonged exposure.
PFAS Exposure Level Risk Table
How concerning are the PFAS levels in your water? This table puts concentration levels in context, using EPA standards and published health research.
PFAS Concentration Risk Spectrum (parts per trillion)
| PFAS Level | Classification | Health Context | Recommended Action |
|---|---|---|---|
| Non-detect (0 ppt) | Below detection limit | No PFAS-related health concern from drinking water. | No treatment needed. Retest every 2 to 3 years. |
| 1 to 4 ppt | Below EPA MCL | Meets federal standards. EPA considers lifetime exposure at this level acceptable, though the MCLG for PFOA/PFOS is zero. | Meets standards. Treatment is optional but can further reduce exposure. |
| 4 to 10 ppt | Above EPA MCL | Exceeds federal drinking water standard. Long-term exposure associated with immune and cholesterol effects in epidemiological studies. | Treatment recommended. See PFAS water filter options. |
| 10 to 70 ppt | Significantly elevated | Well above federal MCL. Exceeds individual limits for PFNA, PFHxS, and GenX (10 ppt each). Increased risk of multiple health effects with chronic exposure. | Treatment strongly recommended for all household members. Prioritize pregnant women and children. |
| Above 70 ppt | High contamination | Exceeds all current standards including the previous 2016 EPA health advisory (70 ppt). Populations with these levels have shown elevated cancer, thyroid, and immune effects in studies. | Treat immediately. Use bottled water until system is installed. Contact your state health department. Call Aidan at 800-460-5810. |
Sources: EPA PFAS NPDWR, 2024; CDC/ATSDR
How to Reduce Your PFAS Exposure
The first step is knowing your PFAS levels. If you have not tested yet, see our PFAS Testing Guide for a walkthrough of options, costs, and how to read your results. If your water test shows PFAS above the EPA's 4 ppt limit (or at any detectable level you are not comfortable with), treatment is the most direct way to reduce your exposure. Here are the proven methods:
Drinking Water Treatment
| Treatment Method | PFAS Removal Rate | Best For | Consideration |
|---|---|---|---|
| Reverse Osmosis | 95%+ removal | Point-of-use (kitchen sink). Removes virtually all PFAS compounds including short-chain variants. | Treats drinking and cooking water at one tap. The Pure-75 RO system ($595) is a cost-effective option. |
| Activated Carbon (GAC) | 60 to 90%+ depending on compound and contact time | Whole-house treatment. Effective for long-chain PFAS (PFOA, PFOS). Less effective for short-chain. | Treats all water in the home. Whole-house carbon filters provide broad contaminant reduction. |
| Ion Exchange (Specialized PFAS Resin) | 95%+ removal | Whole-house PFAS-specific treatment. Effective for both long-chain and short-chain PFAS. | The MAW PFAS Removal System ($1,695) uses ResinTech SIR-110-HP, a PFAS-specific ion exchange media. |
Aidan's recommendation: For most homeowners concerned about PFAS, the best approach is a two-stage system: a whole-house PFAS removal system to reduce PFAS throughout the home, combined with a point-of-use reverse osmosis system at the kitchen sink for drinking and cooking water. This layered approach provides the highest level of protection. Not sure what you need? Call Aidan at 800-460-5810 with your water test results for a personalized recommendation.
Beyond Your Water
Drinking water is a major exposure pathway, but not the only one. To further reduce your total PFAS burden:
- Avoid PFAS-containing food packaging. Microwave popcorn bags, pizza boxes, and fast food wrappers may contain PFAS coatings.
- Check consumer products. Stain-resistant fabrics, water-resistant clothing, and some cosmetics contain PFAS. Look for "PFAS-free" labeling.
- Filter your drinking water. This is the single most impactful step for most households.
- Stay informed. If you are on municipal water, request your utility's annual Consumer Confidence Report (CCR), which now must include PFAS testing results.
For a complete guide to choosing and sizing a PFAS filtration system for your home, see our PFAS Water Filter Buyer's Guide.
Frequently Asked Questions
Can PFAS cause cancer?
Yes. PFOA has been classified as a Group 1 carcinogen ("carcinogenic to humans") by the International Agency for Research on Cancer, the same classification as asbestos and tobacco smoke. The strongest evidence links PFOA to kidney cancer and testicular cancer. PFOS is classified as Group 2B ("possibly carcinogenic"). A 2025 USC study estimated that PFAS in drinking water contributes to approximately 4,600 to 6,900 cancer cases per year in the United States.
What level of PFAS in water is dangerous?
The EPA set enforceable limits of 4 parts per trillion (ppt) for PFOA and PFOS in April 2024. These are the strictest contaminant limits the EPA has ever established, and the Maximum Contaminant Level Goals for both compounds are zero, meaning the EPA determined there is no safe level of lifetime exposure. If your water contains PFAS above 4 ppt, treatment is recommended.
Does everyone have PFAS in their blood?
Essentially, yes. NHANES data from the CDC shows that over 97% of Americans have detectable PFAS in their blood. The average American has approximately 4.25 ng/mL of PFOS and 1.42 ng/mL of PFOA in their blood serum. These levels have declined significantly (PFOS down 85%, PFOA down 70%) since manufacturers began phasing out production, but the chemicals persist in both the environment and the human body.
Can you remove PFAS from your body?
Your body does eliminate PFAS, but very slowly. The half-life of PFOA is approximately 2 to 8 years, meaning it takes that long for your blood concentration to drop by half. PFOS has a half-life of 3 to 7 years. There are no clinically validated methods to accelerate PFAS elimination. The most effective strategy is to identify and eliminate your exposure sources (primarily drinking water, food packaging, and consumer products) so that your body's natural, slow elimination process can reduce your levels over time.
Are short-chain PFAS safer than long-chain PFAS?
Not necessarily. Short-chain PFAS (like GenX/HFPO-DA) were introduced as replacements for PFOA and PFOS partly because they have shorter half-lives in the body. However, a 2026 study found that short-chain PFAS toxicity varies by orders of magnitude between compounds, and some short-chain variants may be more potent than expected. The EPA has set individual MCLs for several short-chain PFAS (10 ppt for GenX, PFHxS, and PFNA), reflecting that they are not considered safe at unrestricted levels.
Should I get my blood tested for PFAS?
The National Academies of Sciences recommends PFAS blood testing for people with elevated exposure histories, including residents of communities with documented PFAS contamination, those living near military bases or industrial facilities, and people with occupational exposure. Blood testing should be a shared decision between you and your doctor. Keep in mind that blood testing identifies exposure levels but does not diagnose specific health conditions caused by PFAS.
Is boiling water effective against PFAS?
No. Boiling water does not remove PFAS. The carbon-fluorine bonds in PFAS are resistant to thermal degradation at water boiling temperatures. Boiling may actually concentrate PFAS by evaporating water volume. Effective removal requires activated carbon filtration, ion exchange, or reverse osmosis.
Does my Brita filter remove PFAS?
Standard Brita pitcher filters provide minimal PFAS reduction. Some newer models marketed specifically for PFAS removal may offer moderate reduction for certain compounds, but a standard pitcher filter should not be relied upon as your primary PFAS defense. For meaningful removal, you need either a dedicated activated carbon system with sufficient contact time, a PFAS-specific ion exchange resin, or a reverse osmosis system. See our PFAS Water Filter Guide for tested options.
Are PFAS in well water or city water?
Both. PFAS have been detected in municipal water systems and private wells across all 50 states. The contamination sources differ: municipal water is more often affected by industrial discharge and firefighting foam runoff, while private wells can be contaminated by nearby industrial sites, military bases, airports, landfills, or agricultural application of biosolids (sewage sludge). The EPA's new regulations apply to public water systems but not private wells, so well owners must test independently.
What are the symptoms of PFAS exposure?
PFAS exposure does not cause immediate, obvious symptoms in most people. The health effects documented in research (cancer, cholesterol elevation, thyroid disruption, immune suppression) develop over months to years of chronic exposure. You cannot feel PFAS in your water or detect it by taste, smell, or appearance. The only way to know your exposure level is to test your water and, if warranted, your blood. If you have unexplained thyroid issues, elevated cholesterol, or live in a known PFAS-contaminated area, talk to your doctor about your potential exposure.
About the Author: This article was reviewed by Aidan Walsh, founder of Mid Atlantic Water with over 30 years of experience in residential water treatment. Aidan has helped thousands of homeowners understand their water quality and choose the right treatment systems. All health claims in this article are cited to peer-reviewed research, government agencies (EPA, CDC/ATSDR, IARC), or expert panel reports (National Academies of Sciences). This article is for educational purposes and is not medical advice. If you have concerns about PFAS exposure and your health, consult your physician.
Questions about PFAS in your water? Call Aidan at 800-460-5810 or send your water test results to support@midatlanticwater.net for a personalized recommendation.