An official website of the United States government
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.
 Image Number D1296-18 |
Soil scientist Clinton Williams prepares for analysis of water samples from a municipal park being irrigated with reclaimed water. The test will determine the fate and transport of the human drug carbamazepine.
Photo by Stephen Ausmus.
