Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Cumulative median concentrations of pharmaceutical chemicals detected during the sampling conducted in June of 2014 in 59 small streams. The four urban study areas are shown in boxes, with details in the study.
