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The Guardian - US
The Guardian - US
Tom Perkins with photographs by Justin Cook

A North Carolina PFAS factory claims its emissions fell by 99.99%. A Guardian test reveals otherwise

Downwind from chemical giant Chemours’ PFAS manufacturing plant in North Carolina, Jamie White’s life is a series of unpleasant negotiations.

She fears the plant’s toxic “forever chemicals” are in the air she breathes and the rain replenishing her well. She suffers from a thyroid disorder – an issue linked to PFAS exposure.

Protecting herself and her family means sacrifice: should she let her grandkids play outdoors on her small farm and ride the horse, or keep them indoors? Her inground swimming pool sits dry. Should she eat potentially contaminated vegetables, or give up gardening?

“It’s awful, but there’s nothing we can do,” said White, who has lived on her small farm for 15 years.

But residents should be safe, Chemours and state regulators claim. A 2019 state consent order legally requires Chemours to rein in pollution from its Fayetteville Works plant and reduce air emissions by at least 99%.

The mandate prompted Chemours to invest $100m on air emission controls, including a thermal oxidizer it bills as “world class” technology allegedly capable of destroying PFAS, which are widely considered impossible to eliminate on an industrial scale.

Chemours made the thermal oxidizer the centerpiece of an ongoing, controversial public relations campaign launched in early 2022. The new technology, the company claims, has reduced PFAS air emissions by “greater than 99.999-plus percent”. State regulators have largely concurred, stating PFAS emissions have been reduced by at least 99%, suggesting the air is safe for residents like White.

Guardian-commissioned testing of air quality outside the plant, however, finds that may not be true. Using a more comprehensive test than those used by state regulators, the Guardian found PFAS levels outside the plant far above those detected and reported as evidence of Chemours’ success – as much as 30 times higher.

Researchers fear the air emissions contribute significantly to widespread PFAS contamination of the region’s water and food supplies.

The Guardian collected air samples at two sites monitored by the North Carolina department of environmental quality (DEQ). Chemours’ tests only check for a very limited number of PFAS, while the Guardian commissioned a test that looks for markers of all the chemicals.

Though the Guardian’s testing employed similar methodology to regulators’, it is not peer-reviewed and has limitations. However, it provides a snapshot of PFAS levels around the plant, researchers who helped design the analysis say.

The findings “clearly raise questions about emissions of compounds not targeted by [state regulators],” said Detlef Knappe, a professor of environmental engineering at North Carolina State University who has studied Chemours’ PFAS pollution and tested some of the Guardian’s samples.

In a statement, Chemours called the Guardian’s findings “false” and “irresponsible”, while questioning the testing methodologies.

Mike Watters’s home (left) is only a mile from Chemours/DuPont plant property on the horizon.
Mike Watters’s home (left) is only a mile from Chemours/DuPont plant property on the horizon. Photograph: Justin Cook/The Guardian


PFAS are a class of chemicals most often used to make water-, heat- and stain-resistant products. The chemicals have been linked to cancer, liver disease, kidney problems and decreased immunity, among other serious health problems.

Chemours, a PFAS manufacturer spun off from DuPont in 2015, has contaminated the environment across hundreds of square miles in south-east North Carolina with PFAS waste, a previous Guardian analysis of regulatory documents found. Many residents charge that it has sickened and killed people on a wide scale and the United Nations recently raised concern that the plant’s pollution violated residents’ right to clean water.

Chemours’ air emissions are concerning because they are easily dispersed across the region. PFAS do not naturally break down once in the environment and many are toxic at very low exposure levels; when it rains, the chemicals can contaminate soil, crops and drinking water supplies.

The Guardian’s findings come as Chemours has proposed an expansion of Fayetteville Works. In its expansion bid and in statements to the Guardian, Chemours repeatedly stressed that its air emissions were in compliance with the consent order and the 99% reduction claim is central to its case.

Knappe said the “disconnect” between the company’s test results and the Guardian’s may stem from the terms of Chemours’ consent order, which includes narrow definitions of PFAS.

Chemours must reduce emissions for three PFAS compounds plant-wide, as well as about 50 through its thermal oxidizer, a DEQ spokesperson said in an email. However, about 15,000 PFAS exist.

When Chemours says it has reduced PFAS emissions by “99.999 plus percent”, the company is referring to the smaller number of PFAS.

A horse drinking water from a trough while a woman wearing a pink t-shirt looks over
‘She gets poisoned water,’ said Jamie White of her horse, Daisy, a 23-year-old Tennessee Walker who drinks from her water trough. White has owned Daisy for 11 years, and she’s been drinking ‘poisoned water’ contaminated with PFAS. She says several horses in the area of died of cancers. Photograph: Justin Cook

The Guardian-commissioned test looked for PFAS that cannot be identified by the tests used by Chemours and regulators. But they are still PFAS, said Graham Peaslee, a professor of physics at University of Notre Dame who conducted the analysis using an “absorbable organic fluorine” test he developed.

Chemours is “spraying PFAS all over the environment”, said Peaslee, referring to the higher level of PFAS detected by the Guardian’s testing. “And it is probably dangerous.”

Fayetteville Works’ air emissions probably come from one of three sources in the plant, according to researchers who participated in the data collection and other experts who reviewed the Guardian’s analysis.

One of those sources is the plant’s thermal oxidizer, which breaks apart PFAS at high temperatures and captures them. But it is possible the PFAS compounds are not captured, researchers who spoke with the Guardian say.

They could also escape as gases that are not detected by testing commissioned by the Guardian or regulators, and there is “no information on what stack emissions are in terms of [PFAS] gases”, Knappe said.

Chemours’ use of thermal oxidizer technology to reduce emissions at a PFAS manufacturing plant is new and the consent order is limited in its testing requirements, so the Guardian’s findings are “not surprising”, said Barbara Turpin, a professor at University of North Carolina who studies PFAS.

“The thermal oxidizer was an important first step but it certainly doesn’t mean Chemours has stopped emitting PFAS,” said Turpin, who has studied Fayetteville Works’ air emissions, but did not collaborate on the Guardian’s testing.

Jamie White, her grandson Aiden Autry, 14, and their horse, Daisy.
Jamie White, her grandson Aiden Autry, 14, and their horse, Daisy. Photograph: Justin Cook/The Guardian

PFAS are highly mobile, volatile and can easily escape from the plant’s piping and buildings, so a second source of air pollution, which Knappe said the Guardian’s testing probably detects, is called “fugitive emissions”. The PFAS found by the Guardian could also stem from failure in other filtration systems, he added.

The DEQ, which conducts air quality testing around Fayetteville Works and enforces the consent order, did not comment on the findings, but said Chemours was in compliance with the consent order.

In an email, a Chemours representative described the absorbable organic fluorine test used by the Guardian as “unproven”. He added that regulators verified the fugitive emissions and thermal oxidizer levels and found them to be in compliance with the consent order.

Like Turpin, White is unsurprised by the Guardian’s findings, but for a different reason – Chemours had tried to deceive residents about Fayetteville Works’ PFAS pollution for years, she said, and many have lost trust. The test results show another discrepancy, she said.

“We don’t expect them to tell the truth,” White added.


The Guardian checked ambient air samples by collecting rainwater in non-fluorinated buckets that were placed within feet of the state environmental agency’s collection sites near Fayetteville Works. It did so during the same time period as the agency – the week of 28 September 2022.

In collaboration with the Guardian, Peaslee conducted the more comprehensive test that looks for markers of all PFAS. The results were compared with the findings from the state test – known as an “EPA 537 modified” – which looked for about 50 PFAS compounds.

At one site, the state reported two parts per trillion (ppt) of PFAS in the air, while Guardian-commissioned testing found 30 times that – 62ppt. At another site, the state showed 76 ppt, while the Guardian found 119 ppt.

The difference is “pretty remarkable”, Peaslee said.

Because the Guardian did not test the same water collected by the state and use identical methodologies, the analysis is not a true side-by-side comparison.

To account for that, the Guardian also checked its samples using a test similar to the EPA 537 modified test used by the state. In three out of four samples, the more comprehensive test still found similar or higher levels – in one case over 30 times above the state’s test.

Chemours questioned the efficacy of testing conducted by Peaslee because it was not verified by a second lab. It also claimed the PFAS detected outside Fayetteville Works may not have come from its plant.

Researchers who reviewed the data said it was possible a very small amount of the PFAS originated elsewhere, but most of the chemicals identified are unique to Chemours.

Fayetteville Works produces particularly small “ultra short-chain” PFAS of which the full amount present in the environment cannot be captured by virtually any test, according to Peaslee, and most of the world’s PFAS pollution is thought to be made up of these chemicals.

“There’s a lot more out there that we’re not capturing, but we’re still finding a lot of the PFAS that [regulators] kicked out of the library and don’t test for,” he said.

Most PFAS research has focused on water pollution and how it affects human health. However, there’s a dearth of research on how PFAS inhalation harms people.

“It’s a good question and the answer is I don’t know, and nobody knows,” Knappe said. “That exposure route is poorly understood.”

But given the track record of the PFAS class, regulators should “exercise extreme caution” with unstudied chemicals, Turpin said.

“Putting more PFAS in the environment is not advisable,” she said.


After over a decade living in the shadow of Fayetteville Works, Mike Watters suffers from blood disease, stubbornly high cholesterol and hypertension, all linked to PFAS exposure. In April, the military veteran had a heart attack that caused his heart to stop beating for nearly three minutes.

He believes PFAS is to blame. “I’m positive it was tied to the PFAS contamination,” Watters said. “In 23 years an enemy could not kill me, but DuPont and Chemours did for 2 minutes and 38 seconds.”

Aside from the toll on his health, the pollution is an endless source of frustration and a financial burden. Watters’s problems are a microcosm of those faced by the larger region.

When PFAS air pollution lands or rains on to the ground, the chemicals percolate through soil into groundwater where they can contaminate wells, or taint drinking water. The contaminated groundwater has been moving into the Cape Fear River, and contaminating downstream communities’ drinking water. Testing has also found chemicals in local vegetables.

Watters, who helped collect samples for the Guardian’s testing, knows firsthand how the pollution can upend lives.

A blue, daily medicine box with doses of medications and different pills
Some of the medications Mike Watters has to take daily in his weekly pill schedule container. Watters has polycythemia vera, a rare blood disease (a type of cancer, pre leukemia) that doctors say is linked to PFAS contamination in his blood. He lives only a mile from the Chemours/DuPont plant. Photograph: Justin Cook/The Guardian

His well is so contaminated that Chemours has provided him with clean drinking water or filtration since 2017, at which point, Watters stopped growing his own food. He began researching ways of living off the land without furthering his exposure to PFAS. His solution: an elaborate, $11,000 greenhouse with air and water filtration systems that he began developing last year. It is expensive, but “it’s the only way to know your vegetables are safe”, Watters said.

In the years since 2017, Watters’s soil appears to have stayed contaminated. In September 2022, soil testing conducted by Knappe on Watters’s property found PFAS at 6ft deep.

Most around Fayetteville do not take these and other precautions against air emissions, he said. He believes they’re misinformed.

“The DEQ tells them it reduces 99.999% [of PFAS],’” he said. “But I’m going ‘OK, you need to read the consent order.’”

In fact, regulators use three separate legal definitions of “PFAS” in the consent order, which opens the door for Chemours to make claims that are legally true but likely do not line up with reality.

According to the consent order and a related air pollution permit, Chemours must reduce “all PFAS” coming from the thermal oxidizer by at least 99.99%. But “all PFAS” in this instance actually means about 50 compounds, the DEQ spokesperson Shawn Taylor told the Guardian in response to emailed questions seeking clarification.

The order also requires Chemours to reduce “facility-wide” emissions of “GenX compounds” by at least 99%. “GenX compounds” encompasses just three kinds of PFAS chemicals, Taylor said.

Taylor did not respond to questions about why the agency would test for three compounds facility-wide, but about 50 from the thermal oxidizer, but reiterated that Chemours emissions were in compliance with the consent order. He noted Chemours was only legally required to reduce emissions emitted from inside the plant, but was not responsible for PFAS in the air outside the plant.

The consent order includes varying definitions of PFAS because of the limited information on some compounds at the time, said Geoff Gisler, a Southern Environmental Law Center attorney that negotiated the consent order on behalf of North Carolina residents who in 2017 sued the company.

A man wearing a blue t-shirt tending to his garden.
Watters with his raised garden beds. He says the PFAS vented from the plant blows over his property with seasonal winds, and rain leeches it into the soil, into his garden and has contaminated his well. He now grows vegetables hydroponically and has raised garden beds full of uncontaminated soil that he buys in the next county. Photograph: Justin Cook/The Guardian

The DEQ has authority to expand its definition of PFAS and test for more chemicals as the technology to do so improves, Gisler said.

“What gets lost here frequently is the requirements in the consent order are not the ceiling, they are the floor,” he added.

Despite absorbable organic fluorine tests offering a more complete picture of PFAS levels, regulators are unlikely to begin widely using them, industry experts say.

The definition of PFAS maintained by the EPA’s toxic chemicals office is relatively narrow; it does not include some chemicals made by Chemours that are defined as PFAS by other agencies across much of the US federal government, EU and scientific world.

In 2019, a citizen group from the Cape Fear basin region in North Carolina, where Chemours is based, filed a petition asking the EPA to conduct health studies on 54 PFAS compounds found in human blood and water in the region. The agency later declined to test for 15 of those chemicals, claiming they “do not meet” the agency’s PFAS definition.

Similarly, there appears to be little appetite to look for all PFAS outside Chemours’ plant using the absorbable organic fluorine test. And so Watters, who recently finished cardiac rehabilitation following his heart attack, believes he will continue to be exposed to dangerous chemicals. So does White, who fights to keep down her weight which has nearly doubled from her thyroid disorder.

She tries to protect herself and family, and has even covered her gardens to shield them from air pollution. But the vegetables died. She said she feels a sense of helplessness.

“We feel completely trapped,” White said.


The Guardian collaborated with Graham Peaslee and Detlef Knappe to develop and conduct this research design.

Using non-fluorinated buckets, the Guardian collected four rainwater samples at three sites located within a half mile of Fayetteville Works. Two of the Guardian’s sites were set up adjacent to – ie within a few feet from – North Carolina department of environmental quality's collection stations in the yards of residential homes. Both the Guardian’s and DEQ’s buckets collected rainwater samples for seven days starting on 28 September 2022.

The Guardian tested its rainwater samples using an “absorbable organic fluorine” (AOF) test developed by Peaslee that looks for markers of all PFAS. The DEQ checked its samples using an EPA 537 modified method that checks for about 50 out of approximately 15,000 PFAS. At one site, the AOF test used by the Guardian found 62 parts per trillion (ppt) of PFAS and the DEQ’s EPA 537 modified test found 2 ppt of PFAS. At another site, the AOF test found 119 ppt and the EPA 537 modified test found 76 ppt.

This is not an apples-to-apples comparison as the Guardian did not test the same rainwater samples as the DEQ and used different buckets for collection. It could be argued that the Guardian by chance collected rainwater with more PFAS, or more ambient PFAS settled in its bucket.

To account for the discrepancy, the Guardian then conducted a second test that was comparable to the one used by the DEQ. Knappe checked the Guardian’s four rainwater samples in his North Carolina State University laboratory using a large volume injection method that looked for most of the same chemicals as the DEQ’s EPA 537 method.

When compared with this second test conducted by Knappe, the AOF test found similar or higher levels of PFAS in three out of four instances. At one site, the AOF test found 66 ppt, while Knappe’s test found 2.7 ppt. At another site, the AOF test found 62 ppt and Knappe’s test found .5 ppt. At a third site, the AOF test found 119 ppt, and Knappe’s test found 116 ppt. At a fourth site, the AOF test found 58 ppt, and Knappe’s test found 150 ppt.

Mike Watters, a resident who lives near the plant and has a DEQ collection site in his front yard, put out the buckets to collect the water. He sent water samples he collected to Knappe’s North Carolina State University lab. He also ran the water through the AOF test filters provided by Peaslee, then mailed the filters to Peaslee’s Notre Dame lab to be analyzed.

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