Nigeria’s Hidden Water Threat: Scientists Uncover Pharmaceutical Pollution in Drinking Supplies

Fadekemi Ajakaiye

In a country where access to clean, safe water is already a pressing challenge, Nigerian scientists are uncovering an invisible but serious threat, pharmaceutical contamination in drinking water. Nnamso Dominic Ibuotenang, a pharmaceutical and medicinal chemist, is leading research to reveal how residues of drugs used for humans and animals are quietly polluting Nigeria’s water systems, posing long-term risks to public health.

In a landmark study published in the Asian Journal of Information Science and Technology (Ibuotenang et al., 2025), he reported that residues of antibiotics, analgesics, antidepressants, and hormonal drugs are now detectable in surface water, groundwater, and even treated drinking water. The study, titled “Pharmaceuticals in Drinking Water: Assessing Human Exposure and Environmental Contamination,” provides one of the most detailed overviews yet of a growing environmental and health crisis in developing nations.

The research identifies multiple pathways through which pharmaceutical compounds enter water systems, including human and animal excretion, improper drug disposal, agricultural runoff, and industrial waste. These compounds resist natural degradation and often survive conventional wastewater treatment processes. Most Nigerian treatment plants were not designed to remove complex organic pollutants. As a result, pharmaceutical residues pass through filtration systems and re-enter the environment, contaminating rivers, boreholes, and wells that millions rely on for domestic use.
“Pharmaceutical pollution is a silent crisis,” Ibuotenang explained. “These compounds are designed to act biologically, and when they persist in our environment, they continue to interact with living organisms in unintended ways.” Even at microgram-per-litre levels, prolonged exposure has been linked to chronic illnesses, reproductive disorders, and ecological disruption.

The study underscores the multifaceted risks posed by pharmaceutical pollution. Antibiotics in water systems encourage antimicrobial resistance (AMR), making infections harder and costlier to treat. Hormonal drugs, especially synthetic estrogens, act as endocrine disruptors, affecting reproductive systems in humans and aquatic species. Nonsteroidal anti-inflammatory drugs (NSAIDs) like ibuprofen and diclofenac have been linked to kidney damage in wildlife and long-term health effects in humans.
“These findings show that pharmaceuticals, even at very low concentrations, can alter aquatic life and affect human well-being,” Ibuotenang noted. “Their effects are subtle, cumulative, and often go unnoticed until damage becomes widespread.”

Nigeria’s environmental vulnerabilities exacerbate the problem. Poor waste management, inadequate sewage treatment, and low public awareness have created conditions ripe for contamination. Many citizens dispose of unused or expired medicines by flushing them or discarding them into household waste, unknowingly allowing chemicals to leach into soil and water sources. Unregulated pharmaceutical sales and limited enforcement worsen the crisis.

“The lack of effective pharmaceutical waste management in developing nations is a critical factor,” the study notes. “Without intervention, contamination levels are likely to rise alongside increased drug consumption.”

Despite these challenges, the study offers practical solutions. Recommendations include modernizing wastewater treatment with advanced technologies like activated carbon adsorption and membrane filtration, promoting green chemistry to design biodegradable drugs, implementing Extended Producer Responsibility laws, conducting nationwide monitoring, and educating the public on safe drug disposal. “Technological innovation must go hand-in-hand with behavioral change,” Ibuotenang explained. “Public awareness is as vital as policy enforcement if we are to prevent further contamination.”

Pharmaceutical pollution is a global concern, but developing countries like Nigeria face the most severe consequences due to limited infrastructure and resources. Ibuotenang’s research shows that locally led science is crucial to addressing these challenges effectively.

“We need African-led science to guide African policy,” he said. “Imported solutions often fail because they don’t account for our social and environmental contexts.”

Ultimately, Ibuotenang’s work emphasizes that water safety extends beyond filtration and infrastructure — it requires chemical awareness and collective responsibility. Pharmaceutical pollution may be invisible, but its impacts are real. With continued research, community education, and stronger governance, Nigeria can protect its water supply.

“Water is life,” Ibuotenang reflects. “Protecting it from pharmaceutical pollution is both an environmental duty and a public health necessity.” As global demand for medicine rises, his research is a call to action for policymakers, industries, and citizens alike: the fight for clean water begins not only at the source, but at the pharmacy shelf.