In brief
Researchers from Harvard and NYU have uncovered concerning findings about per- and polyfluoroalkyl substances (PFAS), linking them to health issues and revealing their persistence in the environment.
As the global community faces significant challenges from climate change and increasing water demand, reliance on treated wastewater is on the rise. However, a recent study has shown that even after wastewater treatment, high levels of toxic substances, known as PFAS or “forever chemicals,” remain present. These chemicals, which have been associated with serious health risks, including cancer, are infiltrating the drinking water supply of millions of Americans.Conducted by a team of researchers from Harvard and New York University, the study analyzed water samples from various wastewater treatment facilities across the nation. Findings revealed that six distinct types of PFAS were notably elevated in the treated samples. In addition, the research highlighted the existence of a broader category of compounds known as organofluorines, which encompass PFAS and are utilized in numerous products such as pharmaceuticals and nonstick coatings, most of which remain unregulated.Bridger Ruyle, an environmental engineering professor at NYU and the lead investigator of the study, raised essential questions regarding the safety of these unmeasured compounds, emphasizing the potential for increased exposure due to the industry's shift towards different PFAS-related substances.The study, published in the Proceedings of the National Academy of Sciences, confirmed that wastewater treatment processes do not adequately eliminate these harmful chemicals from the water. In fact, levels of PFAS tended to rise after treatment in several facilities.Researchers noted that this issue is particularly troubling in the context of growing water scarcity across many parts of the United States, where treated wastewater is increasingly being reused or released into rivers and lakes. Concerns are mounting regarding the possibility of insufficient dilution of wastewater before it re-enters drinking supplies.Statistics show that approximately 50% of the nation’s drinking water originates from areas downstream of wastewater treatment sites, posing a significant risk. Model simulations suggest that PFAS contamination already affects around 23 million individuals in the U.S.Given these findings, researchers underscored the urgent need to address and mitigate ongoing sources of PFAS contamination. The study reflects a broader concern about how continued contamination complicates efforts to repurpose wastewater, which often includes a mix of sewage from households and polluted runoff from industrial sources. Furthermore, the practice of utilizing treated sludge as fertilizer for crops raises additional health concerns regarding PFAS exposure in agricultural settings. Hiroko Tabuchi, a veteran journalist who covers environmental issues, emphasizes the pressing nature of this research and its implications for public health and safety.
