PFAS are a group of over 14,000 synthetic chemicals that don’t break down in the environment or in your body. Scientists call them “forever chemicals” because that’s essentially what they are. Once they exist, they persist for thousands of years.
The CDC has detected PFAS in the blood of 99% of Americans, including newborn babies. As of March 2026, 176 million Americans are drinking tap water contaminated with PFAS.
This guide explains what PFAS are, where you’re being exposed, what the health risks look like, and what you can actually do about it.
The Short Version
PFAS (per- and polyfluoroalkyl substances) are man-made chemicals built on carbon-fluorine bonds, which are among the strongest bonds in chemistry. That strength is what makes them useful in products (nonstick coatings, waterproof fabrics, grease-resistant food packaging) and also what makes them nearly impossible to destroy.
They were first developed around World War II, and we’ve been manufacturing and releasing them into the environment ever since. The EPA’s toxicity database now lists 14,735 unique PFAS compounds.
The problem: they accumulate. In your blood, in your organs, in groundwater, in soil, in fish, in rain. A 2022 study found PFAS in rainwater worldwide at levels exceeding EPA safety guidelines. There is essentially no place on Earth that is PFAS-free.
Where Are PFAS Found?
PFAS show up in more products than most people realize. Here’s where you’re most likely encountering them.
Drinking Water
About 50% of U.S. rivers and streams contain measurable PFAS. The EWG has mapped 9,728 contamination sites across all 50 states, and that number keeps growing. Both public water systems and private wells are affected.
The major contamination sources are military bases and airports (from firefighting foam), industrial facilities (textile and chemical manufacturing), landfills (where PFAS-containing products leach into groundwater), and wastewater treatment plants (which can’t remove PFAS with standard treatment).
Cookware
Nonstick cookware is the product most people associate with PFAS, and for good reason. Traditional Teflon coatings are made with PTFE, which is itself a PFAS compound. When these coatings overheat or get scratched, they can release PFAS particles and fumes directly into your food.
The good news is that PFAS-free cookware options have improved dramatically. Cast iron, stainless steel, carbon steel, and certified ceramic coatings all avoid PFAS entirely.
Food Packaging
Fast food wrappers, microwave popcorn bags, pizza boxes, take-out containers, and candy wrappers have historically used PFAS-based grease-proofing agents. The FDA announced in February 2024 that these agents are no longer being sold for use in food-contact materials in the U.S., but existing inventory may still be in circulation, and imported products may not follow the same rules.
Clothing and Textiles
Waterproof jackets, stain-resistant pants, hiking boots, and backpacks often use PFAS-based treatments for water and stain resistance. The outdoor clothing industry has been slow to change, though brands like Patagonia and The North Face have committed to phasing out PFAS.
Cosmetics and Personal Care
Waterproof eyeliner, mascara, lipstick, foundation, and even some dental floss contain PFAS. A 2021 Notre Dame study found PFAS indicators in over half of the cosmetics tested.
Other Sources
Stain-resistant carpet treatments, fire-suppressing foam (used by firefighters and at airports), and even toilet paper have been found to contain PFAS.
Health Effects: What PFAS Do to Your Body
The research on PFAS health effects has accelerated in the past few years, and the findings are consistently bad. Here’s what the science says as of 2026.
Cancer
Multiple studies have linked PFAS exposure to increased risk of kidney, testicular, and prostate cancers. A 2024 study published in the Journal of Exposure Science & Environmental Epidemiology found that PFAS in drinking water was associated with increased cancer incidence in digestive, endocrine, oral, and respiratory systems.
Thyroid Disease
PFAS are endocrine disruptors, meaning they interfere with hormones. They specifically target the thyroid, adrenal, and reproductive systems. A study published in Lancet eBioMedicine examined the connection between PFAS exposure and thyroid cancer risk.
Immune System Suppression
PFAS weaken your body’s ability to fight infections and reduce vaccine effectiveness. This has been documented in both adults and children. If your immune system isn’t responding to vaccines as well as it should, your PFAS exposure could be a contributing factor.
Reproductive Problems
A 2025 Chinese CDC study found that women with two or more unexplained miscarriages had significantly higher PFAS blood levels than women without pregnancy complications. PFAS exposure has also been linked to decreased fertility in both men and women, and increased blood pressure during pregnancy.
Accelerated Aging
One of the more alarming recent findings: a February 2026 study published in Frontiers in Aging found that two specific PFAS compounds (PFNA and PFOSA, detected in 95% of study participants) were strongly linked to accelerated epigenetic aging in men aged 50 to 64. In plain terms, PFAS may be making your cells age faster than they should.
Liver Damage
PFAS accumulate in the liver and have been associated with elevated cholesterol, fatty liver disease, and reduced liver function.
How Long Do PFAS Stay in Your Body?
PFAS do eventually leave your body, primarily through urination, but the process is painfully slow.
The half-life of the most common PFAS compounds (PFOA, PFOS, PFHxS) in the human body ranges from 2.7 to 8 years. For comparison, lead has a half-life of about 2 months in blood.
So if you stopped all PFAS exposure today, it would take roughly 5 to 16 years for your body to eliminate half of the PFAS currently in your blood. But because we’re all continuously exposed through water, food, and consumer products, our body levels stay elevated even as individual molecules are slowly excreted.
This is why reducing ongoing exposure matters so much. You can’t eliminate what’s already in your body quickly, but you can stop adding more.
The EPA’s Drinking Water Rule (and What Happened to It)
In April 2024, the EPA finalized the first-ever national limits for PFAS in drinking water:
| Chemical | Maximum Level |
|---|---|
| PFOA | 4 parts per trillion |
| PFOS | 4 parts per trillion |
| PFHxS | 10 parts per trillion |
| PFNA | 10 parts per trillion |
| HFPO-DA (GenX) | 10 parts per trillion |
These limits were extremely strict. For context, 4 parts per trillion is equivalent to about 4 drops of water in 20 Olympic swimming pools. The EPA estimated this rule would protect approximately 100 million people and prevent thousands of deaths.
What happened next: In May 2025, the current EPA administration announced it would keep the 4 ppt limits for PFOA and PFOS but rescind limits for several other PFAS compounds and extend the compliance deadline from 2029 to 2031.
Meanwhile, at least 10 states (including Maine, Minnesota, and California) have enacted their own laws restricting PFAS in consumer products like cookware, cleaning supplies, and food packaging. State-level action is filling some of the gaps left by federal rollbacks.
PFAS Lawsuits: The $14 Billion Reckoning
The legal consequences of PFAS contamination are massive and still growing.
As of March 2026, there are 15,220 lawsuits pending in the AFFF multidistrict litigation in South Carolina federal court. These cases involve communities, water utilities, and individuals harmed by PFAS contamination from firefighting foam.
DuPont secured a $2 billion settlement in August 2025 for PFAS contamination at four industrial sites. It was the largest environmental settlement by any U.S. state.
3M and DuPont have a combined $14 billion in water system settlements, with a deadline to submit claims of July 31, 2026. If your local water system has been affected by PFAS, your utility may be eligible for a share of that settlement.
How to Reduce Your PFAS Exposure
You can’t eliminate PFAS exposure completely. It’s in the rain, the soil, and the food supply. But you can significantly reduce the biggest sources of ongoing exposure.
Filter Your Water
This is the single most impactful step. The EPA and EWG both recommend water filtration for PFAS removal.
Reverse osmosis (RO) systems are the most effective, removing close to 99% of PFAS compounds. Look for systems certified to NSF/ANSI 58.
Activated carbon filters are also effective and more affordable. Look for NSF/ANSI 53 certification, which specifically tests for PFAS reduction. Multi-stage carbon filters perform better than single-stage.
Important: Standard Brita pitchers and basic fridge filters are NOT certified to remove PFAS. You need a filter specifically designed and tested for PFAS removal. Check out our guide to the best water filters for PFAS removal for specific product recommendations.
Replace filters on schedule. A clogged or expired filter can actually release concentrated contaminants back into your water.
Switch Your Cookware
Ditch nonstick pans with PTFE/Teflon coatings. Replace them with cast iron, stainless steel, carbon steel, or certified PFAS-free ceramic cookware. The switch is easier and cheaper than most people expect. See our guide to non-toxic cookware for specific recommendations.
Avoid Treated Fabrics and Furniture
Skip stain-resistant treatments on carpets and furniture. When shopping for outdoor clothing, look for brands that explicitly state “PFAS-free” or “PFC-free” water resistance. Many brands now use silicone-based or wax-based water repellents instead.
Check Your Cosmetics
Look for cosmetics labeled PFAS-free, or check the ingredient list for anything containing “fluoro” in the name (like PTFE, polyfluoroethylene, or perfluorononyl). Several clean beauty brands now market specifically as PFAS-free.
Be Careful with Food Packaging
Avoid heating food in fast food wrappers or takeout containers. Transfer food to a plate or glass container before microwaving. While the FDA’s phase-out of PFAS in food packaging is a positive step, existing treated packaging may still be in circulation.
Test Your Water
If you’re on a public water system, your utility should have PFAS testing data available (check the EPA’s database or contact them directly). If you’re on a private well, you’ll need to get your water tested independently. Home test kits are available, though professional lab testing is more accurate.
Our guide on how to test your water quality walks through the options step by step.
How PFAS Get Destroyed (Spoiler: It’s Hard)
One of the reasons PFAS contamination is so persistent is that these chemicals are incredibly difficult to destroy. Standard water treatment processes don’t break them down. Incineration requires temperatures above 1,000 degrees Celsius, and even then, incomplete combustion can create new PFAS byproducts.
Researchers are working on several promising approaches, including supercritical water oxidation, electrochemical treatment, and a 2023 Northwestern University method using sodium hydroxide and DMSO to break carbon-fluorine bonds at relatively low temperatures. But none of these methods are ready for large-scale water treatment yet.
For now, the practical solution for individuals is filtration. You can’t destroy the PFAS in your water at home, but you can remove it before it reaches your glass.
FAQ
How do I know if my water has PFAS? Check the EWG’s interactive PFAS contamination map at ewg.org. You can search by zip code to see documented contamination near you. For definitive results, get your water tested through a certified lab. If you’re on a public system, your water utility should have test data available in their annual Consumer Confidence Report.
Does boiling water remove PFAS? No. Boiling water actually concentrates PFAS because the water evaporates but the chemicals don’t. The only effective home treatment methods are reverse osmosis and activated carbon filtration.
Are PFAS banned in the U.S.? Not broadly. The EPA has set drinking water limits for a few specific PFAS compounds, and some states have restricted PFAS in consumer products. But PFAS as a class are not banned. Thousands of PFAS compounds remain legal and in active use.
Can I get PFAS out of my body faster? There’s no proven medical treatment to accelerate PFAS elimination from your body. Your liver and kidneys process and excrete PFAS naturally, but slowly (half-life of 2.7 to 8 years depending on the compound). The best strategy is to minimize ongoing exposure so your body’s natural elimination process can gradually reduce your levels over time. Some preliminary research suggests that blood donation may slightly reduce PFAS levels, but this hasn’t been conclusively proven.
Is bottled water PFAS-free? Not necessarily. Some bottled water brands have tested positive for PFAS. Consumer Reports tested dozens of bottled water brands and found detectable PFAS in several. If you’re relying on bottled water to avoid PFAS, check whether the brand publishes third-party test results. A home RO filter connected to your tap is more reliable and significantly cheaper over time.
Should I be worried? The honest answer: yes, but not panicked. PFAS exposure is widespread and the health effects are real, but they’re dose-dependent. Reducing your exposure through water filtration and product choices can meaningfully lower your risk. The biggest thing you can do right now is filter your drinking water with a system certified for PFAS removal, because water is typically the largest single source of ongoing exposure.