PFAS chemicals

March 11, 2024

Farmers facing PFAS pollution struggle for solutions

By Shannon Kelleher

When Jim Buckle and his wife, Hannah Hamilton, started their 18-acre organic vegetable farm in Unity, Maine more than a decade ago, they wanted to grow the healthiest food possible. But after a wholesale buyer asked them to test their operation for toxic chemicals called per- and polyfluoroalkyl substances (PFAS) in 2022, the couple was in for a shock.

The soil tests came back clean, as the couple expected. But Buckle’s heart sank when the results arrived for the well water they used to wash and irrigate their vegetables. Through no fault of their own, the farm Buckle and Hamilton had carefully cultivated for nearly a decade was contaminated with PFAS-laced sewage sludge that had been used as fertilizer on land nearby years earlier.

Faced with evidence that their harvests were also likely contaminated with potentially hazardous PFAS toxins, he and Hamilton made the decision to close down their farming operations, at least temporarily, as they wrestled with how they might clean up their farm and protect it from future contamination.

“We said, ‘wow, this is crazy. We actually have this problem,’” Buckle said.

About a year earlier, first-generation organic farmers Katia Holmes and her husband faced a similar crisis on their 700-acre Misty Brook Farm in Albion, Maine, where they raise livestock and grow grains. In their case, the well water was fine, said Holmes. But testing of their cows’ milk – and the hay they bought from a neighbor to feed the cows – came back with elevated levels of PFAS.

Further testing revealed that a previous owner of the Holmes’ land had spread sewer sludge on certain fields 20 years ago, leaving behind PFAS in the soil.

“We called all the stores and pulled all our products,” said Holmes.

Buckle’s and Holmes’ stories are, sadly, becoming more common.

October 26, 2023

PFAS chemicals linked to thyroid cancer, human data suggests

By Shannon Kelleher

Exposure to some per- and polyfluoroalkyl substances (PFAS) may increase thyroid cancer risk, according to a study published Tuesday.

The analysis, which compared blood samples from 88 people who developed thyroid cancer with samples from people who did not, is the first to document an association between PFAS and thyroid cancer, which had been previously hypothesized. Past research has linked these endocrine-disrupting chemicals to thyroid disease, a condition in which the gland produces too many or too few hormones. The new research adds to a growing list of health problems linked to PFAS, including kidney cancer, testicular cancer, ulcerative colitis, high cholesterol, and hypertension during pregnancy.

The study, which looked at eight different types of so-called “forever chemicals,” found that doubly high levels of perfluorooctanesulfonic acid (PFOS) in the blood corresponded with a 56% higher risk for thyroid cancer diagnosis. The PFAS chemicals perfluorononanoic acid (PFNA), perfluorooctylphosphonic acid (PFOPA), and perfluorohexanesulfonic acid (PFHxS) were also found to be associated with thyroid cancer.

“Although preliminary, this is an important study highlighting the risk of thyroid cancer derived from PFAS contamination of water and soil,” said Luca Chiavato, a professor of endocrinology at the University of Pavia in Italy who was not involved with the study.

June 5, 2023

PFAS contamination trial delayed as 3M negotiates sweeping settlement

By Shannon Kelleher and Carey Gillam

Chemical conglomerate 3M is working to settle claims that it is liable for knowingly contaminating the environment with toxic chemicals for decades, delaying what would have been a closely watched bellwether trial in South Carolina.

The trial that had been set to start Monday morning was expected to spotlight long-held secret documents regarding 3M’s knowledge about the dangers of its per- and polyfluoroalkyl substances (PFAS) and how it worked with DuPont to conceal risks of PFAS from the public.

On Friday, DuPont and two related companies that also were named as defendants in the litigation said they would pay close to $1.2 billion to settle liability claims brought by public water systems serving the vast majority of the US population.

Bloomberg reported Friday that 3M was considering a $10 billion settlement.

The plaintiff in the bellwether case is the small city of Stuart, Florida, which accused 3M, Dupont and several other companies of contamination its drinking water with two types of PFAS called PFOS and PFOA that were used in “aqueous film-forming foams” (AFFF) the local fire department had used in training exercises.

More than 4,000 other plaintiffs are part of the broader litigation being overseen by the US District Court in Charleston, South Carolina. The multidistrict litigation (MDL) aims to recover the expenses public and private water utilities are incurring to test, monitor and replace water supplies and to install equipment to try to clear the chemicals from tainted systems.

On Sunday, 3M and lawyers representing plaintiffs in the MDL filed a joint motion for a trial continuance, saying “the parties are making material and significant progress toward a resolution…”

March 14, 2023

EPA announces proposed drinking water standards for six toxic PFAS chemicals

By Shannon Kelleher

The US Environmental Protection Agency (EPA) on Tuesday proposed national standards aimed at reducing levels of six harmful chemicals in drinking water. The move was applauded by health and environmental advocates who say the action is long overdue.

The agency said in a press release that if the rule is implemented it will “over time, prevent thousands of deaths and reduce tens of thousands of serious PFAS-attributable illnesses.”

The EPA action is part of a larger government move to respond to scientific evidence showing that certain types of per- and polyfluoroalkyl substances (PFAS) are associated with a range of health problems, including a heightened risk of developing cancer, birth defects, liver disease, thyroid disease, decreased immunity, hormone disruption and a range of other serious health problems. PFAS have become nearly ubiquitous in the environment, including in water sources.

The new standards target six types of PFAS. For PFOA and PFOS – types known to be particularly dangerous to human health – the agency said the new rule would require public water systems to ensure levels of PFOA and PFOS do not exceed a maximum contaminant level (MCL) of four parts per trillion (ppt). Additionally, the EPA would require public water providers to use a hazard index calculation to determine if combined levels of PFNA, PFHxS, PFBS, and GenX Chemicals pose a potential risk.

“Today we can celebrate a huge victory for public health in this country – US EPA is finally moving forward to protect drinking water across the United States by proposing federally-enforceable limits on some of the most toxic, persistent, and bioaccumulative chemicals ever found in our nation’s drinking water supply,” US attorney Rob Bilott said in a statement. Bilott has been calling for the EPA to address PFAS in US drinking water in 2001.

“It has taken far too long to get to this point, but the scientific facts and truth about the health threat posed by these man-made poisons have finally prevailed over the decades of corporate cover-ups and misinformation campaigns designed to mislead the public and delay action,” added Bilott.

If finalized, all public drinking water systems will be required to monitor for all six PFAS chemicals and to notify the public and reduce PFAS levels if they exceed the standards.

“It’s not surprising that [EPA under the Biden administration] is doing it,” said Phil Brown, co-director of the PFAS Project Lab at Northeastern University and co-principal investigator of a PFAS research and education project at the Silent Spring Institute, in response to the drinking water standards announcement. “Everyone wishes it had happened a long time ago,” he added.

The American Chemistry Council (ACC), which represents the interests of more than 190 chemical companies, called the EPA’s approach “misguided,” and said the new low limits would “likely result in billions of dollars in compliance costs.”

The ACC said it had “serious concerns with the underlying science” used to develop the proposed MCLs, and said the agency was violating its own guidance by combining substances affecting different health endpoints into a single index.

November 7, 2022

New PFAS exposure scoring method could speed research on health effects

Researchers have developed a new statistical tool they say could speed up research on the health effects of exposures to toxic “forever chemicals” that are commonly found in an array of consumer products.

In a study published last week in Environmental Health Perspectives, researchers from the Mount Sinai Medical Center and Johns Hopkins School of Public Health presented a new tool that offers PFAS researchers a way to compare total exposures to PFAS across scientific studies. The tool may provide researchers a more effective method to study these persistent toxins.

PFAS, an acronym for per- and polyfluoroalkyl substances, are a class of thousands of chemicals commonly used in non-stick cookware, food packaging, and waterproof clothing. The chemicals have been linked to certain cancers and reproductive issues.

Studying chemical mixtures is crucial to public health research, since people are exposed to many chemicals—including many types of PFAS—at once in their daily lives. But most studies that focus on toxic chemical mixtures only study those effects in relation to specific health outcomes; for example, a study might determine a chemical’s effect on blood pressure, or heart disease. Additionally, studies might measure different types of PFAS chemicals. That makes it hard for environmental health researchers to compare data.