Antibiotics from human use are contaminating rivers worldwide, study shows
- A McGill University-led study published in May 2025 reveals that human antibiotic use contaminates millions of kilometers of rivers worldwide.
- The team applied a worldwide modeling approach, calibrated with data from 877 sites, to estimate that approximately 8,500 tonnes of antibiotics enter rivers each year following human use and wastewater processing.
- The study highlights that nearly one-third of consumed antibiotics reach rivers at concentrations that can harm aquatic life and promote antimicrobial resistance, with amoxicillin responsible for 45% of at-risk river lengths.
- Lead author Heloisa Ehalt Macedo highlighted that antibiotics can disperse widely from their points of origin, emphasizing that their persistence in the environment represents a global challenge with significant implications for ecosystem and human health.
- The findings call for urgent global monitoring, improved wastewater treatment, and management strategies to reduce antibiotic pollution and mitigate its impact on ecosystems and human health.
15 Articles
15 Articles
Traces of pharmaceuticals are contaminating rivers and oceans worldwide
Pharmaceuticals from human waste, industry, and agriculture are polluting global waterways and potentially fueling antibiotic resistance and ecological disruptions.Kiley Price reports for Inside Climate News.In short:A global study found that over a quarter of sampled river sites in 104 countries had unsafe levels of pharmaceutical contamination, including antibiotics and antidepressants.In low-income countries with weak wastewater infrastructur…
Antibiotic pollution widespread in world’s rivers, study finds
Nearly a third of all antibiotics that people consume end up in the world’s rivers, a new study finds. This could potentially harm aquatic life and impact human health by promoting drug resistance, researchers say. Antibiotics, critical for treating various bacterial infections, are widely consumed by people, livestock and aquaculture fish, but the drugs are only partially absorbed by the body. Much is excreted, entering the environment, especia…
750 Million People May Live Near Water Laced With Antibiotics
Right now, roughly 8,500 tons of antibiotic residues are washing through the global river system annually, with over 3,300 tons ultimately reaching oceans and lakes. This discovery comes from a new study from McGill University that examined how antibiotics from human consumption alone, not including veterinary or industrial sources, are contaminating waterways worldwide. The post 750 Million People May Live Near Water Laced With Antibiotics appe…
Researchers find 8,500 tonnes of antibiotics enter rivers every year
A global study led by McGill University estimates that 8,500 tonnes of antibiotics enter river systems annually, mostly from human use—even after wastewater treatment. The findings warn that chronic exposure poses risks to aquatic life and fuels antibiotic resistance, especially in regions with poor sanitation.


Antibiotics from human use are contaminating rivers worldwide, study shows
Millions of kilometers of rivers around the world are carrying antibiotic pollution at levels high enough to promote drug resistance and harm aquatic life, a new study warns. The study estimated the scale of global river contamination from human antibiotics use. Researchers calculated that about 8,500 tons of antibiotics -- nearly one-third of what people consume annually -- end up in river systems around the world each year even after in many c…
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