176 Million People
176 million Americans drink tap water contaminated with PFAS, the synthetic chemicals known as “forever chemicals” because they do not break down in the environment or the human body. The CDC has detected PFAS in the blood of 99% of Americans tested, including newborn babies.
176 million Americans exposed to PFAS in their drinking water. The chemicals are in the blood of 99% of us.
The EPA’s testing program identified 9,728 contaminated sites across all 50 states. But 76% of ZIP codes in America have never been tested. The actual number of affected people is likely closer to 200 million.
What PFAS Does to People
PFAS exposure at very low doses has been linked to cancer, thyroid disease, high cholesterol, decreased fertility, liver damage, hormone disruption, and immune system suppression. Studies show PFAS reduces vaccine effectiveness. Children exposed in utero show developmental effects. The GAO called PFAS “the biggest water problem since lead.”
These are not chemicals that flush out of your system. They accumulate. Every glass of contaminated water adds to a lifetime body burden that cannot be reversed.
What the EPA Did in 2024
In April 2024, the Biden EPA set the first-ever federal limits on PFAS in drinking water. The rules covered six chemicals, including the two most notorious, PFOA and PFOS, at 4 parts per trillion. Utilities had until 2029 to comply. The rules were projected to prevent thousands of cancer cases and reduce PFAS exposure for 100 million people.
What the EPA Did in 2026
In May 2026, the Trump EPA rolled back protections for four of the six regulated chemicals. GenX, PFBS, PFNA, and PFHxS were deregulated entirely. The EPA retained limits on PFOA and PFOS but allowed utilities to extend the compliance deadline from 2029 to 2031.
4 of 6 regulated PFAS chemicals deregulated. The remaining 2 delayed by two years. Up to 105 million people lose protections.
The EPA’s own toxicity assessments of GenX and PFHxS found that exposure to “extremely small doses could similarly pose serious health risks.” The agency deregulated them anyway. The justification was that the Biden administration “went too far, too fast” and did not follow appropriate rulemaking procedures.
Earthjustice called it a decision to “leave millions at risk of harm.” The Environmental Defense Fund said the rollback weakens national drinking water protections at the moment the testing data showed the problem was worse than previously known.
Who Is Most Exposed
PFAS contamination is concentrated near military bases, airports, industrial facilities, and firefighting training sites where PFAS-containing foam was used for decades. But the chemicals have spread through groundwater, soil, and rain into water systems far from the original sources.
Low-income communities and communities of color are disproportionately affected because they are more likely to live near contamination sources and less likely to have water systems that can afford filtration technology.
The EPA estimated that compliance with the 2024 rules would cost water utilities about $1.5 billion per year. The annual health benefits of those rules were estimated at $254 billion. The cost of not filtering the water is 170 times the cost of filtering it.
Where It Stands
States are filling the gap. Several states have set their own PFAS limits stricter than the federal standards. But most states have not, and the communities most at risk are the ones least able to afford independent action.
The EPA’s contamination map continues to grow. The testing continues. The chemicals continue to accumulate. The rules that would have addressed it were rolled back five months after the data showed 176 million people were exposed.
Read more on the Environment hub and our EPA enforcement brief.