Are fish getting high on cocaine?

Both prescription and illegal drugs such as morphine, cocaine and oxycodone have been found in surface waters in Canadian rivers. New research from McGill shows that wastewater discharged from wastewater treatment plants in the Grand River watershed of southern Ontario has the potential to contaminate sources of drinking water with these drugs. The study, which was just published in the journal Environmental Toxicology & Chemistry, shows that although these drugs are found only in relatively limited quantities in the river water, their concentration did not decline with distance downstream from the wastewater treatment plant discharge. Moreover, many of the drugs were not removed completely during drinking water treatment. Improving wastewater treatment. A wastewater treatment plant cleans the bulk of contaminants from the wastewater which arrives from sources ranging from household wastes to chemical plants prior to discharging the water into the river. At some distance downstream in the river, a drinking water treatment plant then further treat the water prior to consumption.