US military veterans carry substantially higher levels of PFAS «forever chemicals» in their blood than people who never served, according to new peer-reviewed research led by Brown University. The study is the first to directly compare blood concentrations between veterans and civilians, adding fresh urgency to long-standing concerns about toxic exposure at the nation's military installations.
PFAS, short for per- and polyfluoroalkyl substances, are a class of synthetic chemicals used in firefighting foam, nonstick coatings, and water-repellent fabrics. They are called «forever chemicals» because they do not break down in the environment or the human body, accumulating over time and persisting for years after exposure ends. Groundwater, surface water, and soil around many US military bases show some of the highest PFAS contamination levels in the country, a direct consequence of firefighting foam deployed during training exercises and emergency responses.
The contamination problem at military sites has been documented for more than a decade, with regulators and researchers identifying hundreds of installations where PFAS has seeped into drinking water supplies and surrounding ecosystems. What sets the Brown University study apart is its focus on the people who served at those bases. By measuring PFAS concentrations in veterans' blood and comparing them with those of civilians, the research offers the clearest evidence yet that military service may carry a lasting chemical burden.
The findings raise pointed questions about the health risks service members face long after they leave active duty. PFAS exposure has been linked in prior research to a range of conditions, including certain cancers, thyroid disorders, immune system effects, and developmental problems. For veterans, those risks may compound the physical and mental health challenges that often follow military service.
The study arrives amid growing public and regulatory scrutiny of PFAS contamination nationwide. Federal agencies have moved in recent years to set drinking water limits for some PFAS compounds and to fund cleanup at contaminated sites, but the scale of the problem at military bases remains enormous. Firefighting foam, known as aqueous film-forming foam, was used for decades at airfields, training grounds, and crash sites, allowing the chemicals to leach into groundwater that often served nearby communities.
Veterans' advocates have argued that the Department of Defense and the Department of Veterans Affairs have been slow to acknowledge and address the scope of exposure. The new research could strengthen calls for expanded health monitoring, disability benefits, and cleanup funding for those who served at affected installations. It also underscores a broader scientific challenge: PFAS compounds are so persistent that even after exposure stops, blood levels decline only gradually, meaning today's veterans may carry the chemical signature of decisions made decades ago.
The Brown University-led team's work adds to a growing body of evidence that environmental contamination at military sites is not merely an ecological issue but a public health one with a human face. For the roughly 18 million veterans living in the United States, the study suggests that the legacy of service may include chemical exposures that are only now being measured and understood.
Researchers say the comparison between veterans and civilians provides a baseline that was previously missing from the scientific literature. Without such data, it has been difficult to quantify how much additional PFAS burden military service imposes. The new findings may help shape screening guidelines and inform veterans about their potential exposure history, particularly those who served at bases with known contamination.
The study's implications extend beyond individual health. It raises questions about the military's responsibility to prevent future exposures, the adequacy of current cleanup standards, and the long-term costs of environmental contamination at installations that remain in active use. As PFAS research advances, the veterans who served at these sites are emerging as a population whose health outcomes may serve as an early warning for broader environmental risks.
