PFAS come from industrial manufacturing and end up in your life through a surprisingly wide range of everyday products, from nonstick pans to rain jackets to fast food wrappers. These synthetic chemicals, often called “forever chemicals” because they don’t break down naturally, have been produced since the 1940s and now contaminate drinking water, soil, and food supplies worldwide. Understanding where they originate helps explain why they’re so hard to avoid.
What PFAS Are and Why They’re Everywhere
PFAS are a family of thousands of synthetic chemicals built around chains of carbon and fluorine atoms. That carbon-fluorine bond is one of the strongest in chemistry, which is exactly why manufacturers prize these compounds: they repel water, resist grease, withstand heat, and reduce friction. It’s also why they persist in the environment essentially forever. Once released, they don’t degrade into harmless substances the way most organic chemicals eventually do.
U.S. domestic PFAS manufacturing volume has fluctuated over the past decade but remained in the hundreds of millions of pounds annually. 3M, one of the original and largest PFAS producers, announced in December 2022 that it would exit PFAS manufacturing entirely, and company officials confirmed they completed that phase-out by the end of 2025. However, 3M acknowledged that finding PFAS-free alternatives for products like lithium batteries, circuit boards, seals, and gaskets remains difficult. Other manufacturers around the world, particularly in China, continue large-scale production.
Consumer Products in Your Home
The most direct way PFAS reach people is through the products they buy and use. Nonstick cookware is the most well-known example, but the list is long: stain-resistant coatings on carpets and upholstery, water-resistant fabrics like rain jackets, umbrellas, and tents, cleaning products, and paints, varnishes, and sealants. Personal care products including shampoo, dental floss, nail polish, and eye makeup can also contain PFAS. Even ski wax uses them.
These products slowly release PFAS into the air and dust inside your home. A study of childcare centers found median total PFAS concentrations of 523 nanograms per gram in household dust and 471 nanograms per gram in carpet samples. The researchers found strong associations between PFAS levels in carpets and the dust collected nearby, confirming that treated carpets act as both a source and a reservoir for these chemicals. Young children, who spend more time on floors and put their hands in their mouths, face higher exposure from this pathway.
Food Packaging and Wrappers
Grease-resistant food packaging is a major source of PFAS exposure. Fast food containers, microwave popcorn bags, pizza boxes, candy wrappers, and other grease-resistant paper products are commonly treated with PFAS to keep oil from soaking through. Testing of paper and board food packaging has revealed total fluorine concentrations ranging from roughly 300 to 4,000 parts per million in the material itself, with some packaging exceeding 100 parts per million of PFAS specifically.
The chemicals migrate from packaging into the food it holds, especially when the food is hot or greasy. After testing revealed high PFAS concentrations in their packaging, some companies have worked with paper mills to redesign fiber chemistry so the paper resists grease without PFAS. But the transition is uneven across the industry, and many food wrappers still contain these chemicals.
Firefighting Foam
Aqueous film-forming foam, known as AFFF, is one of the most concentrated sources of PFAS contamination in the environment. This foam has been the standard tool for extinguishing fuel fires (the kind involving gasoline, jet fuel, and other flammable liquids) at airports, military bases, oil refineries, and fire training facilities for decades. When sprayed, the PFAS-laden foam soaks into the ground and eventually reaches groundwater.
Research on U.S. military bases has directly linked AFFF formulations to groundwater contamination. The problem is especially severe at sites where training exercises involved repeatedly dousing practice fires with foam over many years. Firefighters themselves carry elevated levels in their blood. A study in San Francisco found that female firefighters assigned to airport fire stations had twice the blood levels of certain PFAS compared to firefighters stationed elsewhere. A similar study in Finland confirmed that training activities using AFFF to extinguish jet fuel fires increased firefighters’ blood concentrations of PFAS.
Industrial and High-Tech Manufacturing
Beyond consumer goods, PFAS play critical roles in industries where their chemical stability is hard to replace. Semiconductor manufacturing relies on PFAS across numerous production processes because of their unique combination of heat resistance, chemical inertness, and surface properties. As chip production expands globally, this sector represents a growing source of PFAS waste. Medical devices, including certain implants and tubing, also use PFAS for their nonstick and biocompatible properties.
How PFAS Spread Through Water and Soil
Once PFAS enter the environment from any of these sources, they cycle through water systems in ways that amplify exposure. Wastewater treatment plants are a key pathway. These facilities receive PFAS from households, hospitals, and industries through the sewer system, but conventional treatment processes can’t break down or remove them. The chemicals pass straight through and are discharged into rivers, lakes, and streams. A 2016 study of Washington state surface waters found that PFAS levels were elevated in waterways receiving a large proportion of treated wastewater, particularly under low-flow conditions where there was less clean water to dilute the discharge.
The solid waste left over from wastewater treatment, called biosolids, concentrates PFAS at levels an order of magnitude higher than in the liquid wastewater. Biosolids often contain types of PFAS not even detected in the incoming water, likely formed through chemical transformations during the treatment process. When these biosolids are spread on agricultural fields as fertilizer (a common practice), they introduce PFAS directly into farmland soil. Research on how far PFAS migrate through soil after this application is still limited. One Arizona study found the chemicals stayed tightly bound to the upper soil layers, but conditions vary widely by region, and no national soil thresholds exist yet.
Landfills as Long-Term Reservoirs
Landfills are one of the most significant environmental reservoirs of PFAS. Every PFAS-containing product that gets thrown away, from old nonstick pans to stain-treated carpets to greasy food wrappers, ends up decomposing in a landfill while its PFAS remain intact. Rain and moisture percolating through the waste dissolve these chemicals and carry them into leachate, the liquid that drains from the bottom of a landfill. Studies have consistently found high levels of PFAS in landfill leachate, which can contaminate surrounding groundwater if containment systems leak or are overwhelmed.
What Regulators Have Done So Far
In April 2024, the EPA finalized the first-ever national drinking water standard for PFAS, setting maximum contaminant levels of 4.0 parts per trillion for the two most studied compounds, PFOA and PFOS. The agency set its health goals for these chemicals at zero, meaning no amount is considered completely safe, but established the 4.0 parts per trillion limit as the lowest level that water systems can feasibly detect and achieve. To put that number in perspective, one part per trillion is roughly equivalent to a single drop of water in 20 Olympic-sized swimming pools. Water utilities across the country now face deadlines to test for PFAS and install treatment systems if their levels exceed this threshold.
These standards address one exposure route, but PFAS continue entering the environment through manufacturing, product use, wastewater discharge, and landfill leachate simultaneously. The chemicals’ durability means that even as some producers phase out PFAS, the ones already released will persist in soil and water for generations.