What are PFAS?

What does PFAS stand for?

PFAS stands for per-and polyfluoroalkyl substances, which contain a strong carbon-fluorine bond that allows them to accumulate over time in the environment and in the bodies of animals and people, posing health risks. PFAS chemicals might also be thought of as “everywhere chemicals,” since they’ve become so common in the products we use every day.

Where does PFAS contamination come from?

Manufacturing processes and waste storage and treatment sites release PFAS into the air, soil, and water. The Environmental Working Group (EWG) has identified 41,828 industrial and municipal sites in the U.S. that are known or suspected of using PFAS. Among the industrial facilities the group pointed to are petroleum stations and terminals, chemical manufacturers, commercial printers, plastics and resin manufacturing sites, paint and coating manufacturers, semiconductor manufacturers, makers of metal products and electrical components, and electroplating and polishing.

EWG recently released an additional report based on EPA data that found PFAS may be discharged by more than 1,500 U.S. textile mills. Landfills and waste disposal facilities, along with sewage and waste treatment plants, are other common sources of contamination.

In addition, military bases and airports are major contributors to PFAS contamination, mostly from training and testing exercises using firefighting foam. EWG mapped 385 U.S. military installations with PFAS contamination and several hundred more that are suspected to be contaminated. Many nearby communities also suffer groundwater and drinking water contamination as a result of their proximity to these facilities.

What’s the difference between PFAS, PFOS, PFOA, PTFE, and GenX?

There are estimated to be more than 9,000 PFAS chemicals. Some of the most common include Perfluorooctane Sulfonate (PFOS) and Perfluorooctanoic Acid (PFOA), also known as C8. These chemicals were once widely used in substances like fabric and leather coatings, household cleaning products, firefighting foams, and stain-resistant carpeting. Although manufacturers have phased out their use in Canada and the U.S. over the past two decades, they remain ubiquitous in the environment—and in our bodies. Dupont developed GenX as a replacement for PFOA in 2009, but subsequent studies of GenX have also raised health concerns.

Polytetrafluoroethylene (PTFE), along with C8/PFOA, were used to produce Teflon, the non-stick chemical coating manufactured for decades by Dupont and now Chemours, which Dupont spun off in 2015.

What are the dangers of PFAS?

PFAS are in the blood of nearly all Americans, and testing of umbilical cord blood and breast milk indicates that exposure begins before birth. Some PFAS bioaccumulate—build up—which means even low exposures are cause for concern over time as our bodies accumulate more and more of them. PFAS bioaccumulation also occurs in non-human organisms, including fish and other human food sources, which eventually end up in people. That’s another reason protecting the environment from PFAS contamination—and monitoring PFAS levels—is so important.

PFAS are endocrine disrupting chemicals, meaning they interfere with our hormone systems. When an external chemical interferes with our hormone systems, it can lead to changes in our bodies and brains capable of causing disease and, in some cases, even death.

Research links PFAS to health problems including kidney and testicular cancer, liver and thyroid problems, reproductive problems, pregnancy-induced high blood pressure, low birthweight, and increased risk of birth defects, among others. PFAS has also been linked to changes in cholesterol levels and in the timing of puberty. Evidence of PFAS impacts on immune function is another growing concern, and studies have found some PFAS may lower vaccine effectiveness.

PFAS contamination also has an environmental justice dimension, as low-income communities and communities of color are often more likely to be located near sites of PFAS contamination, increasing their health risks.

Why is PFAS getting so much attention now?

Although there is evidence that makers of PFAS were aware of their adverse health effects as far back as the 1950s, the general public was largely uninformed. The companies kept health research from employees and the public for decades, as EWG chronicles in this timeline. We know much more about the health impacts of PFAS today.

In 1998, the company 3M, maker of the Scotchgard water- and stain-repellent material, alerted the EPA that PFOS builds up in blood and had been detected in blood samples of people across the United States who weren’t exposed on the job. Data received from 3M eventually prompted greater EPA scrutiny of PFAS.

While almost everyone has PFAS in their bodies today, those living or working near PFAS manufacturing, industry, or disposal sites face heightened risk of health problems.

• Some 80,000 local residents of Parkersburg, West Virginia, settled a lawsuit against Dupont, which was found to be knowingly contaminating ground and river water with PFAS chemicals for decades, despite evidence that the chemicals were toxic to humans and animals. A subsequent study found a likely link between PFOA/C8, and several serious health conditions, including cancer.

• For more than three decades, a chemical manufacturing plant outside of Fayetteville, North Carolina owned by Dupont and later Chemours dumped PFAS-contaminated waste into the Cape Fear River. Not until 2017 did the public learn they were consuming water contaminated with a newer PFAS, GenX, and other lesser-known PFAS compounds.

• In the 1960s, the Wolverine Worldwide Tannery in Rockford, Michigan contaminated land, groundwater, and the Rogue River—once Rockford’s drinking water source—with PFAS-laden leather manufacturing waste. The EPA is now considering whether to designate the former tannery and its old dump as federal Superfund sites.

• The group Physicians for Social Responsibility recently reported that oil and gas companies used PFAS and substances that could degrade into PFAS at more than 1,200 fracking wells across six states—Arkansas, Louisiana, Oklahoma, New Mexico, Texas, and Wyoming—between 2012 and 2020.

Where do you find PFAS?

PFAS have been used around the world since the 1950s in a wide variety of consumer goods. Today, they can be found in products like firefighting foam, non-stick cookware, cosmetics, and materials that protect against grease, oil, and water, such as stain-resistant carpeting and fabrics, food packaging, and water-repellent clothing. So whether we’re camping, hiking, hunting, fishing, cooking, putting on makeup, enjoying a takeout meal, or playing with our kids on the living room floor, PFAS have infiltrated everyday life.

Are PFAS alternatives safer?

An international group of scientists has called for a phase-out of PFAS according to how essential the chemicals are. In short, things like cosmetics and most other personal care products that can be made without PFAS should be. In other cases, there may be safer substitutes available, such as for waterproof jackets and equipment.

Right now, though, the most common substitutes for PFAS are other PFAS chemicals. So-called short-chain PFAS have been developed as supposedly safer alternatives to the older long-chain PFAS. That’s what happened in the 1990s, when 3M struck a deal with the EPA to phase out PFOS in Scotchgard products. The company replaced it with an alternative that lingers in people’s bodies for significantly less time, decreasing human exposure. The EPA subsequently created a voluntary stewardship program for PFOA that encouraged companies to phase out its use and develop safer alternatives.

Researchers from around the world have expressed concerns, however, that more study is needed to determine whether current PFAS alternatives are truly safe. Even if they leave the human body sooner, they still build up in the environment, which could continue to create serious pollution problems over time.

What are governments doing to protect people from PFAS?

Even now, there are no federal standards limiting PFAS discharges. In 2021, the EPA issued a “PFAS roadmap” with a timeline for setting drinking water and wastewater treatment standards, health assessment protocols, and hazardous substance designations for several PFAS chemicals, including PFOA and PFOS.

Congress is currently considering comprehensive PFAS legislation. The U.S. House of Representatives passed the PFAS Action Act of 2021 and advanced it to the Senate. A separate House bill, The Clean Water Standards for PFAS Act, would require water discharge limits on PFAS from chemical manufacturers, paint, paper, plastics, electrical components, textiles, leather tanning, metal finishing and electroplating companies.

Growing concerns about the health and environmental impacts of PFAS is prompting action at the state level as well. A recent analysis found that at least 32 U.S. states are considering more than 210 bills that would ban or restrict PFAS, including in personal care products, clothing, and food packaging.

Europe is moving faster. The European Union is considering a ban on thousands of PFAS chemicals except when their use is deemed essential. If successful, a final agreement could come by 2025.

What can you do to avoid PFAS?

Completely avoiding PFAS is almost impossible, and the cost of cleanup is enormous. But there are things you can do to reduce your risk and advocate for change.

• Avoid water and stain-repellent carpeting and household textiles, such as curtains, furniture upholstery, bedding, table cloths, and napkins.

• Limit use and purchase of “waterproof,” “water-resistant,” and “stain-resistant” clothing and other products, and “anti-fog” eyeglass sprays and wipes

• Avoid food packaged in greaseproof bags or containers. As an alternative, use your own glass containers for takeout and leftovers. Encourage restaurants to ditch food containers and packaging containing PFAS. Skip microwave popcorn from PFAS-treated bags.

• Be aware that not all compostable packaging is PFAS-free: choose BPI-certified packaging to be sure, and ask about it at restaurants that use compostable containers.

• Cook with stainless steel, cast iron, glass, or ceramic cookware instead of non-stick options.

• Read personal care product and cosmetic labeling carefully and avoid those with “perfluor-,” “polyfluor-,” “PTFE,” or Teflon on the label.

• Find out if your water source has been tested for PFAS. If it contains PFAS, or if it hasn’t been tested, a water filter might be a good purchase. However, be aware that not all water filters are equally effective; a 2020 Duke University study found that reverse osmosis filters and two-stage filters performed best at eliminating PFAS.

• If you drink bottled water, try to purchase water labeled “purified,” rather than spring water.

And, of course, stay in touch with EHN. We will continue to report on PFAS. Our ongoing testing and coverage of PFAS contamination in food packaging and common consumer goods, coupled with reporting on policy and regulation, seeks to hold companies, political leaders, and agency officials accountable for protecting the public.

We also have a rich archive of PFAS coverage from U.S. and international news organizations. Enter “PFAS” in our search tool in the upper right-hand corner of our homepage to find all of it.

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