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.
Combined sewer outfall (CSO) at stream sampling location 03085550 Chartiers Creek at Crafton, Pennsylvania, during the wet weather event for the ALCOSAN project (Lee Eicholtz, USGS).
Public Domain.
