We are sharing important information about a recent study linking "forever chemicals" (PFAS) in tap water to an increased cancer risk. This analysis, published in the Journal of Exposure Science & Environmental Epidemiology, found that exposure to PFAS in public drinking water is associated with up to a 33% higher cancer risk in certain parts of the United States.
Researchers at the Keck School of Medicine at the University of Southern California (USC) conducted an ecological study, analyzing county-level cancer incidence data alongside federal water-testing results. They controlled for other factors influencing cancer rates, such as smoking, obesity, income, and air pollution.
The study observed higher incidence rates for several cancer groups in counties with PFAS detections, including digestive system, thyroid and other hormone-related, respiratory, and some head-and-neck cancers. Specific patterns emerged when data was split by sex, with associations in men leaning toward kidney, bladder, nervous system, leukemia, and soft tissue cancers, and in women toward thyroid, oral cavity, and soft tissue cancers.
While this study offers population-level estimates and doesn't prove causation for individuals, the observed patterns are consistent with how PFAS chemicals are known to behave in the body, interfering with hormone signaling, stressing the liver, and promoting chronic inflammation.
The implications for public health are significant. We can take steps to address this, including checking local water quality reports for PFAS monitoring results and considering certified point-of-use filters like activated carbon or reverse osmosis units.
This study underscores the importance of continued strong testing, enforcement of modern limits, and upgrading treatment systems where needed.
