The waste in water.
A U.S. Geological Survey study shows that pharmaceuticals, hormones and other waste water-related chemicals have been found in rivers and streams across the nation.
In a study of 139 streams in 30 states, the most frequently detected compounds included: plant and animal steroids, insect repellent, and caffeine.
The issue is particularly sensitive in farm states where antibiotics fed to hogs and chicken end up in rivers.
The USGS says it is uncertain if the contaminants found in the water pose a potential health threat to humans or aquatic life.