PFAS “forever chemicals” in tap water associated with higher cancer risk. Remove PFAS from your water with a home RO water filter.
11 Sep 2025
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We are sharing important information about a recent study that links chemicals found in tap water to an increase in cancer rates. According to that study, exposure to PFAS "forever chemicals" in tap water has been associated with up to a 33% higher cancer risk.
The study, conducted by researchers at the Keck School of Medicine at the University of Southern California (USC), found that counties with PFAS detections generally had higher incidence rates for several cancer groups, including digestive system cancers, thyroid and other hormone-related cancers, respiratory cancers, and some head-and-neck cancers.
In men, associations leaned toward kidney and bladder cancers, certain nervous system cancers, leukemia, and soft tissue cancers. In women, the clearest signal was thyroid cancer, along with oral cavity and soft tissue cancers.
About the Study:
This was an ecological study that analyzed county-level cancer incidence data alongside water-testing results from federal monitoring programs. The researchers controlled for other factors known to influence cancer rates, such as smoking, obesity, income, urban-rural differences, and air pollution.
What This Means:
While the study provides national, population-level estimates and does not offer individual-level proof, the observed associations are consistent with how these chemicals behave in the body. Dr. Li, the lead scientist, emphasizes that additional restrictions on PFAS may be necessary to protect public health.
What You Can Do at Home to Remove PFAS from Your Tap Water:
Check Local Water Quality Reports: Utilities are required to publish water quality reports, which often include PFAS monitoring results.
Use Certified Filters: Point-of-use filters certified to reduce PFAS, such as activated carbon and reverse osmosis units, can be effective. Regular maintenance is crucial.
Private Wells: If you rely on a private well, consider testing through a certified lab and consult your health department if PFAS are detected.
The full study was published in the *Journal of Exposure Science & Environmental Epidemiology*. This information is crucial for understanding and addressing the potential risks associated with PFAS in our water supply.