Antibiotic Pollution Threatens Global Rivers and Public Health, Study Warns

A study led by McGill University in Canada warns that millions of kilometers of rivers worldwide are contaminated with antibiotics at levels high enough to exacerbate antimicrobial resistance and harm aquatic ecosystems. Published in PNAS Nexus, a journal of the Proceedings of the National Academy of Sciences (PNAS), the research is the first to quantify the global impact of human antibiotic use on river pollution.

The findings reveal that approximately 8,500 tonnes of antibiotics—nearly one-third of annual human consumption—end up in river systems each year. While many of these drugs pass through wastewater treatment facilities, current processes often fail to remove them completely.

Although individual antibiotic concentrations in rivers are typically low, prolonged and cumulative exposure poses significant risks to both ecosystems and human health. By combining global modeling with field data from nearly 900 river sites, researchers found that concentrations of amoxicillin, one of the most widely used antibiotics, already exceed safe thresholds in several regions, particularly in Southeast Asia. This is attributed to rising antibiotic consumption and inadequate wastewater treatment infrastructure.

The study underscores the indispensable role of antibiotics in medicine while highlighting their unintended environmental consequences, including the spread of antibiotic resistance and ecological disruption. Notably, the research accounts only for antibiotics used in human medicine; contributions from agriculture and pharmaceutical manufacturing could further worsen the situation.

Experts urge enhanced monitoring of antibiotic pollution in rivers, especially in high-risk areas, and the implementation of regulatory measures to mitigate contamination. The study provides critical insight into safeguarding global water resources and public health.