Can PFAS in your tap water increase your risk of cancer?

What's actually in it

PFAS get into drinking water from factories, military bases, landfills, and firefighting foam. Once in a water supply, they're almost impossible to remove with standard treatment. Many public water systems across the US contain measurable levels of PFOS, PFOA, and other PFAS compounds. You can't see, smell, or taste them. The only way to know if they're in your water is to check your utility's testing results or get your water tested independently.

What the research says

A 2026 study in Environ Health compared PFAS levels in public drinking water across the United States with cancer rates in the same communities. The researchers used EPA testing data from thousands of water systems and matched it with cancer prevalence data.

The results showed a link: communities with higher PFAS in their drinking water had higher rates of cancer. The association was strongest for cancer types that previous studies had already connected to PFAS, including kidney cancer and testicular cancer.

PFAS are classified as "possibly carcinogenic" by international health agencies, and the evidence keeps getting stronger. These chemicals accumulate in the body over years of exposure. Even low concentrations in water add up when you drink it, cook with it, and bathe in it every day.

A reverse osmosis or activated carbon filter certified to remove PFAS is the best defense for your home water supply. Check the NSF/ANSI 53 or 58 certification, which specifically covers PFAS reduction. Pitcher filters vary widely in how well they remove PFAS, so check the brand's testing data.