The Revelator: Residual drugs largely unfiltered by existing wastewater plants

Aquatic species around the world are exposed to at least 600 types of residual drugs, ranging from anti-inflammatories to antidepressants, and it’s not fully understood how these chemicals will ultimately affect marine ecosystems.

Some research indicates that a species of crayfish is emboldened by antidepressant compounds in the presence of predators, lessening its flight response. Scientists have also noted the presence of pharmaceuticals among invertebrates, as well as seaweed.

More work is needed to further document the effects of the chemicals on the behavior and reproduction of aquatic life, but people can temper the introduction of pharmaceuticals in the first place by never flushing medications down the toilet or any other drain, and checking in on the filter technologies in place at their local wastewater treatment plant. Some advanced carbon filters can successfully remove pharmaceuticals from wastewater before it’s released into the environment.