Antidepressant Levels Elevated in North Carolina Waterways

Researchers have detected elevated levels of antidepressant drugs in several North Carolina waterways. These levels could pose risks to aquatic wildlife. The study found these drugs and their metabolites in rivers downstream from wastewater treatment plants.

Antidepressants are difficult to remove during standard water treatment processes. Up to 90 percent of these drugs pass through the human body into wastewater. This incomplete removal can lead to environmental contamination.

Emily Vincent and colleagues from the University of North Carolina at Chapel Hill sampled four rivers and one isolated lake in December 2024. They analyzed the samples for 34 antidepressant compounds. These included selective serotonin reuptake inhibitors (SSRIs) and selective norepinephrine reuptake inhibitors (SNRIs).

Seventeen different drugs or metabolites were found downstream of treatment facilities. Samples taken upstream or in the lake were mostly drug-free. Some contaminant concentrations exceeded levels known to cause behavioral changes and toxicity in aquatic animals. Previous studies on animal exposure to these drugs were often short-term and involved single compounds. Further research is needed on chronic and combined exposures.

Erin Baker, a corresponding author of the study, stated that pharmaceuticals are increasingly found in waterways globally. This is especially true near wastewater treatment plant discharge sites. This presents a growing environmental concern.

The findings also have potential implications for human health. Many tested waterways provide drinking water and are used for agriculture and recreation. Researchers emphasize the need for broader sampling efforts worldwide. They also call for effective remediation strategies to remove these pharmaceuticals from wastewater.