A recent study by the US Geological Survey (USGS) has found that a startling number of American streams carry traces of drugs. The researchers sampled 59 small streams in the Southeast for 108 different pharmaceutical compounds, and one or more chemicals were detected in every sampled stream. Steams tested positive for six chemicals on average.

Among the most common drugs found in the streams were acetaminophen (Tylenol), lidocaine (a pain reliever), tramadol (an opioid pain reliever), fexofenadine (an antihistamine found in Mucinex and Allegra, among others), and metformin (a type 2 diabetes drug).

The contamination of our environment with pharmaceuticals is increasingly problematic. Not only are they in our drinking water, they’re in our food supply as well.

Biosolids—a euphemism for human waste—are being pushed on unsuspecting farmers by local or state governments as a cheap fertilizer alternative, even though they can be riddled with drugs and personal care products and are rarely if ever tested for these substances. And the pharmaceuticals found in biosolids can wreak havoc on animal and plant life.