PFAS exposure carries documented health risks including kidney and testicular cancer, thyroid disease, elevated cholesterol, and pregnancy complications, and the manufacturers that put these “forever chemicals” into drinking water and consumer products now face one of the largest mass tort dockets in U.S. history, with 3M alone agreeing to pay up to $12.5 billion to public water suppliers. Per- and polyfluoroalkyl substances are synthetic compounds built on a carbon-fluorine bond so strong that they do not break down in the environment or in your body. They have been in use since the 1940s in nonstick cookware, waterproof clothing, stain-resistant fabrics, grease-resistant food packaging, and firefighting foam, and decades of that use have left measurable concentrations in the blood of nearly every American tested.
How People Are Exposed
Most exposure is ordinary and household. Nonstick pans, water-repellent jackets, and stain-resistant carpet and upholstery shed PFAS into indoor dust as they age. Grease-resistant food wrappers, microwave popcorn bags, and takeout containers transferred the chemicals directly into food for decades, though the FDA confirmed in early 2024 that grease-proofing agents containing PFAS have been pulled from the U.S. market, and in January 2025 formally revoked food-contact authorizations for 35 PFAS substances used on paper and paperboard packaging.1U.S. Food and Drug Administration. Market Phase-Out of Grease-Proofing Substances Containing PFAS Older stocks may still be on shelves, but new production has stopped.
The concentrated contamination comes from industry. Manufacturing plants discharge PFAS-laden wastewater into waterways. Aqueous film-forming foam, used for decades to suppress fuel fires at military bases and civilian airports, has saturated groundwater at hundreds of sites. Once PFAS reach an aquifer, they travel with the water indefinitely and surface in private wells and municipal systems that serve entire communities.
A quieter pathway runs through farmland. When sewage treatment plants process wastewater, the resulting sludge, called biosolids, is sometimes spread on fields as fertilizer. PFAS survive the treatment process and accumulate in the soil, where crops absorb them and livestock take them in through water and forage.
Health Risks Linked to PFAS
These chemicals accumulate in blood and organs over years, and the body eliminates them very slowly. The half-life of PFOS in the human body is estimated at roughly four to five years, which means a single large exposure can keep producing biological effects for a decade or more.
The most consistently documented effect is elevated cholesterol. People with higher PFAS blood levels tend to have meaningfully higher total cholesterol, which compounds cardiovascular risk over time. Liver enzyme changes indicating hepatic stress are another well-established marker. In children, high PFAS blood concentrations reduce the immune response to routine vaccinations, meaning the body produces fewer protective antibodies after immunization.
At higher exposure levels, medical data show increased rates of kidney cancer and testicular cancer in populations with documented long-term exposure. PFAS can interfere with hormone signaling, which is linked to thyroid disease and to pregnancy complications including preeclampsia. These are the diagnoses that drive the individual personal-injury side of PFAS litigation.
Getting Tested
If you suspect significant exposure, a doctor can order PFAS blood levels through any CLIA-certified commercial laboratory, and some lab companies sell the panel directly to consumers without a physician order.2Agency for Toxic Substances and Disease Registry. Clinical Evaluation and Management – PFAS Information for Clinicians Results typically come back within seven to ten days.
The National Academies of Sciences, Engineering, and Medicine groups results into three tiers based on the combined concentration of seven PFAS compounds in your blood:
- Below 2 ng/mL: adverse effects are not expected, and standard medical care applies.
- 2 to under 20 ng/mL: some potential for harm, particularly in sensitive populations. Clinicians should prioritize screening for abnormal cholesterol, hypertensive disorders of pregnancy, and age-appropriate breast cancer screening.
- 20 ng/mL or higher: increased risk of adverse effects. Clinicians should add thyroid function testing for adults, screen patients over 45 for signs of kidney cancer, and screen patients over 15 for testicular cancer and ulcerative colitis.3National Center for Biotechnology Information. Guidance on PFAS Exposure, Testing, and Clinical Follow-Up
One caveat matters for anyone considering a lawsuit: a blood test tells you how much PFAS is in your system now, but it cannot identify the exposure source, predict future outcomes, or prove on its own that a current illness was caused by PFAS.2Agency for Toxic Substances and Disease Registry. Clinical Evaluation and Management – PFAS Information for Clinicians Documented levels above the 20 ng/mL threshold are still a significant piece of evidence in both medical decision-making and litigation.
Checking Your Water
For public water, the EPA finalized the PFAS National Primary Drinking Water Regulation in April 2024, setting enforceable limits of 4 parts per trillion each for PFOA and PFOS and a hazard-index limit covering four additional compounds.4Federal Register. PFAS National Primary Drinking Water Regulation Utilities must complete initial monitoring by April 26, 2027 and have treatment in place by April 26, 2029. You can look up detections in your supply through the EPA’s online PFAS Analytic Tools, which compile testing data from public water systems nationwide.5U.S. Environmental Protection Agency. PFAS Analytic Tools Your utility’s annual Consumer Confidence Report will include PFAS results once the 2027 monitoring deadline arrives. Some states have set stricter standards than the federal rule, so your local limits may be lower.
If you draw from a private well, no federal regulation protects you. The EPA does not regulate private wells or set PFAS standards for them, and advises well owners to contact their state environmental or health agency and use a state-certified laboratory for testing.7U.S. Environmental Protection Agency. PFAS in Private Wells
Reducing Exposure at Home
Three home treatment technologies have proven effective:
When shopping, look for NSF/ANSI Standard 53 certification for carbon filters or NSF/ANSI Standard 58 for reverse osmosis, with a specific PFAS reduction claim.8U.S. Environmental Protection Agency. Identifying Drinking Water Filters Certified to Reduce PFAS A carbon filter without that specific certification has not been verified to remove these compounds. Point-of-use filters on a single faucet are the cheapest option; whole-house systems cost significantly more.
The PFAS Lawsuits
Thousands of cases alleging harm from aqueous film-forming foam have been consolidated into a single multi-district litigation in the U.S. District Court for the District of South Carolina, with over 10,000 cases opened as of recent filings.9United States District Court District of South Carolina. In Re: Aqueous Film-Forming Foams Products Liability Litigation Plaintiffs include both public water systems seeking cleanup costs and individuals claiming personal injuries from PFAS exposure.
3M produced the largest settlement to date, agreeing to pay between $10.5 billion and $12.5 billion over 13 years to resolve claims brought by public water suppliers.103M Investor Relations. 3M Settlement with Public Water Suppliers to Address PFAS in Drinking Water Receives Final Court Approval Those funds are earmarked for testing, treatment, and filtration upgrades at affected water systems, with claims submissions continuing through 2030. Other chemical manufacturers face separate litigation tracks.
Plaintiffs generally press two theories. Product liability claims argue that manufacturers knew about the health risks of PFAS but failed to warn users or regulators. Negligence claims target the improper disposal of chemical waste that eventually contaminated public water supplies. Individual personal injury cases require expert testimony connecting a specific diagnosis to PFAS exposure, which is a high evidentiary bar but one that medical monitoring data and blood test results have made increasingly surmountable.
Bellwether trials in the AFFF multi-district litigation, the test cases meant to signal how juries might respond, were originally scheduled for late 2025 but have been postponed as a large wave of new claims entered the docket. The judge overseeing the litigation delayed trials to allow those new cases to be incorporated and assessed. The postponement reflects the scale of the litigation, not weakness in the underlying claims.
Firefighters and Industrial Workers
Certain jobs carry far higher exposure. Firefighters face a double source: the aqueous film-forming foam itself and the turnout gear worn on every call. A National Institute of Standards and Technology study found PFAS concentrations in the outer layers of turnout coats and pants vary by manufacturer but are consistently present, and that abrasion, heat, and weathering cause those concentrations to increase over time.11U.S. Fire Administration. Results of 2nd NIST Study on PFAS in Turnout Gear Firefighters have been shown to carry higher blood concentrations of certain PFAS than the general population, and the link between occupational exposure and elevated cancer risk has driven a significant share of individual injury claims in the AFFF litigation. Workers in PFAS manufacturing, semiconductor fabrication, and other industrial users of these chemicals also face elevated exposure.
Statute of Limitations
Timing catches most PFAS plaintiffs off guard. Every state imposes a deadline for filing a personal injury lawsuit, and missing it means losing the right to sue regardless of the merits. Under the traditional rule, the clock starts at the time of injury. Toxic exposure cases rarely work that way, because you may not know you were exposed for years and symptoms can take decades to appear.
Most jurisdictions have adopted the discovery rule for toxic torts. Under that approach, the limitations period begins when you knew or reasonably should have known both that you suffered harm and that the harm was connected to the earlier exposure. For someone diagnosed with kidney cancer in 2025 who only then learns about PFAS contamination in a former neighborhood’s water supply, the clock arguably starts at diagnosis rather than at the point of exposure years earlier. Deadlines and interpretations vary significantly by state, so anyone considering a PFAS claim should consult a lawyer early. Delay itself can become the biggest obstacle to recovery.