U.S. Geological Survey studies have found hormone medications, antidepressants, and antibiotics in waterways nationwide from medicines in human waste and disposal of unwanted drugs down sinks and toilets. Scientists are studying the possible impacts on humans and marine life when exposed to these drugs, but you can minimize potential problems by safely disposing of unused medicines.

Dispose of medicines safely: 

• Never put medicines down sinks or toilets
• Bring unwanted or expired medications to the Regional Water Quality Control Plant five days a week (for residents of East Palo Alto, Palo Alto, Mountain View, and Los Altos). 
• Palo Alto residents may bring unwanted medication to an upcoming Household Hazardous Waste Collection Event.
• Find other disposal locations in the Bay Area