Does drinking water with trace amounts of PFAS raise your blood levels?

What's actually in it

PFAS get into water supplies from manufacturing facilities, military bases, airports, and industrial sites. Most municipal water treatment doesn't remove them. PFAS have been detected in tap water systems serving over 200 million Americans.

The EPA set new limits for several PFAS in drinking water in 2024, but many utilities are still working toward compliance. And many PFAS don't yet have legal limits at all.

What the research says

A 2026 study in Water Research tracked PFAS at trace levels through drinking water and measured resulting blood concentrations. The key finding: PFAS bioaccumulate. Even at concentrations below current regulatory limits, regular consumption of PFAS-contaminated water leads to measurably elevated blood levels over time.

Unlike most chemicals, PFAS don't get flushed out. Once in your blood, they bind to proteins and persist for years. Some PFAS have half-lives of 8 years in the human body, meaning it takes 8 years for your body to eliminate half of what you absorbed.

The study found that PFAS from drinking water were a primary contributor to blood levels for people in affected areas, more so than food or consumer product sources. Filtering your tap water with a certified reverse osmosis or activated carbon filter can substantially reduce this exposure.