Communities across the United States are facing a significant health risk due to drinking water contaminated with per- and polyfluoroalkyl substances (PFAS). Recent research conducted by the Keck School of Medicine of USC has revealed a concerning link between PFAS exposure and a higher incidence of certain cancers, with rates up to 33% higher in affected areas.
PFAS are synthetic chemicals commonly found in consumer products like furniture and food packaging. Unfortunately, these chemicals have made their way into approximately 45% of drinking water supplies in the U.S. Studies have previously associated PFAS exposure with various health issues, including kidney, breast, and testicular cancers.
The Keck School of Medicine study, published in the Journal of Exposure Science & Environmental Epidemiology, marks the first investigation into the connection between cancer and PFAS contamination in drinking water in the U.S. The researchers conducted an ecological study using large datasets to identify patterns of exposure and associated risks.
Between 2016 and 2021, counties with PFAS-contaminated drinking water showed higher rates of specific types of cancer, varying by gender. The estimated annual contribution of PFAS in drinking water to cancer cases exceeds 6,800 based on data from the EPA.
Lead researcher Dr. Shiwen (Sherlock) Li emphasized the importance of further research into the specific links between PFAS and different types of cancer. The findings also underscore the necessity of regulating PFAS levels in drinking water. While the EPA plans to monitor six types of PFAS starting in 2029, stricter limits may be required to protect public health.
Analyzing extensive datasets on cancer cases and PFAS levels in drinking water, the study revealed elevated cancer incidence in counties exceeding recommended PFAS levels. Males and females in affected areas showed higher rates of specific cancers, with potential implications for over 6,800 cancer cases annually.
Moving forward, individual-level studies are needed to confirm the causal link between PFAS and cancer and explore underlying biological mechanisms. The study’s results support the argument for stricter regulation of PFAS levels in drinking water, suggesting that current proposals may not be comprehensive enough.
The research conducted by the Keck School of Medicine sheds light on the urgent need to address PFAS contamination in drinking water to safeguard public health. By raising awareness of the risks associated with PFAS exposure, this study contributes to ongoing efforts to protect communities from the harmful effects of these chemicals.
